Iterate through list values in dictionary python. Using the key, you can access the value.
Iterate through list values in dictionary python The dictionary I'm iterating over is much larger, has much more complexly named keys, and is not in alphabetical/numerical order. append(item['value']) however my data set is quite large. format(k,v) for k,v in d. Related Article: How to Use Redis with Django Applications. Jan 2, 2015 · names = [value['name'] for key, value in list. I've tried playing with for value in PIX0. append(i) Apr 11, 2024 · In this Python tutorial, you will learn about Python iterating through a dictionary with multiple values. Python Iterate dictionary by index using sorted() function. In this code, we use the keys() method to obtain a view of the dictionary's keys, and then we iterate over these keys using a for loop. Mar 31, 2014 · This of course does not update the original dictionary, just extend the values list. If you need to modify the dictionary, consider creating a copy or using a separate loop. I would iterate over the value's of the key directly. splitlines() dic = {} lis = [] for i in splitLines: if not i. keys() returns an iterable list of dictionary keys. The simplest and the most common way to iterate over a list is to use a for loop. The list contains two dicts. urlencode (urllib. Mar 23, 2017 · I am trying to replace list element value with value looked up in dictionary how do I do that? python: iterate through list and replace elements with Dec 13, 2008 · There's an existing function that ends in the following, where d is a dictionary: return d. Code works for "shallow" dictionaries (with no sub-dicts). Syntax: Oct 21, 2024 · How to Iterate Over a Dictionary in Python. In other words: print x[0],y[0],z[0],'\n',x[1],y[1],z[1] where x, y and z are lists(in your case the values in your dictionary. Approach: Iterate over the keys of dictionary. In your post you say that you want a dictionary of values that are arrays of all the values; if so, step one, init a resource outside of the loop, and then within the loop, update it. Mar 27, 2016 · Iterating over a Python dict means to iterate over its keys exactly the same way as with dict. Feb 16, 2024 · In Python programming, creating a list of dictionaries is a common task, particularly when dealing with structured data. Alternatively you can always access the value via key as in the following I'm trying to loop through a dictionary and print out all key value pairs where the value is not a nested dictionary. Explanation: Jan 19, 2024 · To extract dictionary values from a list, we iterate through each dictionary, check for the key's presence, and collect its value. """ return cls. Feb 7, 2024 · When it comes to looping through a list, the while loop can be a handy alternative to the more commonly used for loop. 3 us above): Feb 23, 2010 · In a more general case, e. 7, 9. Example : dict = {'apple':'red','mango':'green','orange':'orange'} I want to iterate through the dictionary from first to last, so that I can access the dictionary items by their indexes. Jan 29, 2020 · In recent versions of Python, the dictionary data structure's array simply holds indices to each item in another array, where the items in the other array are kept in insertion order. values(), you can employ a for loop, accessing each value sequentially. values() and thats allowed me to iterate through the dictionary values, but I don't know how to use that to "check" the user answers against the dictionary keys. In this article, we'll explore four simple examples of how to loop through a list using the while loop in Python. In this tutorial, we will delve into various methods to loop through a dictionary in Python, exploring different aspects and providing multiple Mar 7, 2014 · { value for bar in iterable } is a set comprehension . Example: Print all elements in the list one by one using for loop. items():; iterating the keys and then looking it up means unnecessarily looking up information you could have gotten for free with . Simply use the dictionary's items method to iterate over key,value pairs instead: ["{}_{}". Feb 12, 2024 · Below, are the methods for Iterate Python Dictionary Using Enumerate() Function in Python. Dec 3, 2011 · use python to loop through values in dictionary to change value based on key. values() directly instead. If I am right look for iterating over multiple lists in python. search(v)}) Mar 10, 2015 · I have a list of real values: values = [0. May 12, 2014 · Iterations in Python are over he contents of containers (well, technically it's over iterators), with a syntax for item in container. This additional array can be used to iterate over the dictionary in insertion order, still in O(n) time, but without having to skip over unused spaces in the Jan 18, 2012 · This updates the original dictionary value if the value is a string and starts with a space. items()] Since value is defined in the for part of the comprehension, you can perform operations on value for the item part of the comprehension. You can also use a for loop to iterate over a dictionary. values() to go through all May 17, 2017 · This is how I would do it. Nov 22, 2021 · Python provides several ways to iterate over list. items(): for value in values: print(f'{k} - {value}') Share Dec 29, 2016 · loop round a list, if the list does not start with whitespace then use this as a dictionary key, if it does start with whitespace use this as a dictionary value output = '''One Two Three Four''' splitLines = output. Syntax: I can of course iterate through the list and extract each value using a for loop: results = [] for item in test_data: results. The easiest way, and perhaps most straight-forward way to do this would be: Jul 9, 2020 · This is iterating over all of the keys and values in your dictionary and creating those entries in the new JobsWithNums dict. Iterate and modify python dictionary values. startswith(" "): lis. The keys are in the tuple format (i,j). But to make it really random you will be using random module. You iterate over these, and are handed each value in turn. g. Note how if you did a print() within in the loop, you would get each class_info output singularly. if you were adding or removing keys, it might not be safe to change the structure of the container you're looping on -- so using items to loop on an independent list copy thereof might be prudent -- but assigning a different value at a given existing index does not incur any problem, so, in Python 2. items()] I am trying to create a dictionary where values are obtained from iterating a list. iterating through the list elements inside the dictionary. We are going to look at them one by one. I am relatively new to Python since I mainly used Java. Loop Through by Key and Value using dict. update({k: v. values() already returns a list copy, not a dictionary view; you'd use values = First_dict. Apr 16, 2019 · Or, to replace the original data in-place, make the function iterate through the given dict or list and replace a value by the key (for dict) or index (for list) if it's a match, and recursively apply the function to the value: May 3, 2024 · Dictionary Iteration or Looping in Python. items() Use dict. 2, 3. tuples, sets, or dictionaries). keys()) #get list of keys from dictionary keys. Iterating through list of dictionaries to extract specific key/values in python. So how should I do it? Apr 10, 2019 · Python: properly iterating through a dictionary of numpy arrays 548 Is there any pythonic way to combine two dicts (adding values for keys that appear in both)? Oct 16, 2011 · As Charles Brunet have already said that the dictionary is random arrangement of key value pairs. capitals={'15':'Paris', '16':'New York', '17':'Berlin', '18':'Brasilia', '19':'Moscou'} keys=list(capitals. You have several options for iterating over a dictionary. any, it's better May 30, 2024 · 4. value for e in cls} @classmethod def keys(cls): """Returns a list of all the enum keys. There are following ways to iterate an iterable object in Python: for statement (your answer); Comprehension, including list [x for x in y], dictionary {key: value for key, value in x} and set {x for x in y} If you want to iterate over individual item on an individual collection: from collections import defaultdict for k, values in d. The first dictionary is the original one, and the others are the first two dictionaries I want to output. using iteritems i am not able to do this. Apr 27, 2023 · Given a dictionary with values as a list, the task is to write a python program that can access list value items within this dictionary. Create a List of Dictionary in Python Using For LoopBelow are some Aug 4, 2017 · Instead of assigning user1 as the variable name for the dictionary you could create a new dictionary variable where the key is the user and the value is a nested dictionary with all of the information about the users like this: Nov 24, 2021 · Goal: to add a ~tag to the tail end of any value, in a complex dictionary, with a % of occurrence. Use urllib. In order to do a dict comprehension , you have to provide Python with a set of key-value pairs separated by : : Jan 6, 2023 · How to Iterate through a Dictionary with a for Loop. 1, 2. Avoid modifying the dictionary during iteration: Modifying the dictionary while iterating through it can lead to unexpected behavior. Iterating through a dictionary refers to going through each key-value pair one by one, accessing a dictionary, and traversing every key-value present. a = list(a) # keys in list a = a. You can iterate through a Python dictionary using the keys(), items(), and values() methods. Instead items or iteritems would return a list of tuples of key value pair or an iterator to iterate over the key and values. 8] I want to have the number of items iterated over, until some condition was met. I am wanting to Oct 2, 2023 · Iterating Over Dictionary Keys; Iterating Over Dictionary Values; Iterating Over Both Keys and Values; Iterating Over Dictionary Keys. def constructResult(*args): I want to iterate through a dictionary in python by index number. Syntax keys() dictionary. compile(r'^\s|\s$') d. W3Schools offers free online tutorials, references and exercises in all the major languages of the web. Because that's what you get when you iterate over the dict. iterate over a subset of dictionary keys. Oct 23, 2019 · I also have an official gene list text file. keys() I tested various methods to go through a list of dictionaries and return the dictionaries where key x has a certain value. In Python, the statement a += 3 is translated - in most cases - to a = a + 3. You can use this: import re rex = re. Mar 28, 2024 · In this example, Python code iterates through a nested dictionary, printing the outer key and then iterating through the inner dictionary to display each inner key-value pair. Create a List of Dictionary in Python Using For LoopBelow are some The keys in a Python dictionary are not in any specific order. keys(), . In a certain case, I need to return the index of an item. Loop Through A List Using While Loop In Python. More from Python Aug 24, 2023 · In Python, to iterate through a dictionary (dict) with a for loop, use the keys(), values(), and items() methods. urlencode in Python 2. values()). 0. How to iterate over list of dictionary in python? 0. data_dict = {'view': ['premium_subscribers', 'premium_content'], 'delete': ['admins', 'normal_content', 'premium_content']} for key in data_dict: values = data_dict[key] # iterate over list of values for v in values: # Now you have access to each one print(v) Nov 1, 2015 · To get the list: resultList = grouped_data["results"] Iterate through the list to get the dictionaries: for dic in resultList: # use dic To get values inside dic: for dic in resultList: for key,value in dic. if i = 3, j = 3, the keys are Nov 15, 2016 · What is the best way to iterate over all indexes in a list which is the value of a key in a dictionary? i. 1. Using the key, you can access the value. Maybe dictionary is the wrong data structure for this task? Sep 22, 2012 · But iterating over the list itself is basically the same as iterating over any other list: >>> some_dict_list = some_dict. Dec 3, 2021 · Iterating over a dictionary using for loop. Example 1: Basic Iteration with Enumerate() In this example, the enumerate() function is used with the items() method of the dictionary, which returns key-value pairs. itervalues() creates an iterator over values. python: iterating through a dictionary with list values. I want to work with any complex I'm trying to iterate over a dictionary that I have defined in a specific order, but it always iterates in a different order than what I have defined in my code. For example, for key in dictionary: print(key, dictionary[key]) . UPDATE: If you want to use Regular Expressions and avoid using starts with and endswith. If anyone could help it would be appreciated. Python3 May 2, 2014 · I want to set up a python script that will take 2 inputs (a set of key value pairs & a nested list). Looping Through Dictionary Items. items() to return a view object that gives a list of dictionary’s (key, value) tuple pairs. items() to access key-value pairs when iterating through a Python dictionary. The __iter__() method returns an iterator with the help of which we can Dec 28, 2017 · Then I pop the first (0) element of the list and then use for loop to pull each city with the keys left in the list. items() returns the key-value pairs in a dictionary. I tried this. This is just a basic example of what I'm trying to do. Add multiple values to a dictionary key. This is because it avoids the overhead of creating a list of the dictionary's keys or items. When you iterate over a dictionary, using a for loop, you are actually just iterating over the keys. It’s a crucial task if you want to use a dictionary properly in Python. In the sample code below I've inserted a gratuitous for loop to force a number of them to be created so the following print statement will have something to display. To iterate over a dictionary in Python, you can use a For loop. I want to iterate the set of key value pairs through each item of the nested list, updating the list with the appropriate new values within the key value pairs. If the program returns Invalid Reg, then I need to get the key that the invalid reg belongs to - which will be a name. iteritems(): # use key and value To access the id key, use: Oct 12, 2015 · You don't iterate with lambda. Jan 3, 2018 · Around 1993, Python got lambda, reduce(), filter() and map(), courtesy of a Lisp hacker who missed them and submitted working patches. x). For example, if the condition was item > 5, the result would be 3. This is because you are not dealing with individual values but with pairs. I tried this: for key,value in dict: but didn't work because it assigned the first element of the tuple to the key and value and the second to the value. It provides a clear representation of the hierarchical structure of the nested dictionary. [GFGTABS] Python a = [1, 3, 5, 7, Jan 26, 2012 · I am guessing that your logic is to iterate through multiple lists simultaneously. Sep 8, 2012 · To be pythonic and ducktype-y, and also to follow "ask for forgiveness not permission", you could do something like: try: iterator = obj. The update() method inserts the specified items to the dictionary. values() # values in list a = a. e. Inside the loop, we can use dictionary access methods like keys(), values(), or items() to retrieve the keys, values, or key−value pairs, respectively. for key in my_dict: value = my_dict[key] print(key, value) How to loop through a dic value in python template. The simplest and most straightforward method to iterate through a list of dictionaries is by using a for loop. Mar 17, 2021 · You can loop through key value pair in dictionary using for loop and using Update method you can add key value pair from dict2 to dict1. Python - Iterate over dictionary. Any help appreciated. items(): print(key, value) The output for this code snippet is the same as the previous one. The approach is to use a for loop to iterate through each dictionary in the list. If you want key, value pairs to be yielded, use items() method (iteritems in Python 2. Consider using OrderedDict: Use OrderedDict if you need to preserve the insertion order of the dictionary. The values are ints. We will show you how to iterate over a dictionary in Python using a for loop. To iterate through all values of a dictionary in Python using . e. The dicts contain various key/value pairs, all strings. Jan 28, 2025 · In Python programming, creating a list of dictionaries is a common task, particularly when dealing with structured data. Oct 26, 2020 · Since dictionaries are collections, you can also iterate over them. You have a one element list, which contains a dictionary, whose keys are the book name, and whose value is another dict – Jon Clements Commented Aug 10, 2013 at 21:39 Mar 30, 2018 · @Peterino Yes though in python 3 it would be very rare that you'd need to explicitly invoke iter(d. Feb 20, 2018 · You are iterating over class_details and replacing class_info each time. . You should use . See full list on geeksforgeeks. wordList=[['animal','shell'],['animal','wings'],['technology'],['food','sweet']] and then iterating through that list backwards, checking if the length of each element in the list is greater than 1. I have written a function which will shuffle all the keys and so while you are iterating through it you will be iterating randomly. For example, the 1st item will be apple, and the 2nd item will be mango and value will be green. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. values() instead. Auxiliary space: O(1) as no extra space is used, only the dictionary and variables are used. Iterating through a dictionary means going through each key-value pair one by one. items()) you iterate only over the list of its keys (a list Loop Through a Dictionary. Feb 15, 2024 · The below approach code uses list comprehension and the items() method on a dictionary in Python to iterate through its keys and values. Jul 1, 2022 · I am looking to iterate through a dictionary and create a new dictionary for each of the values within a list of the value shown below. """ return {e. values(): which by the way, is what everyone would probably be doing in most practical use cases. To do this, there are several commonly used methods for dictionary iteration: Use keys() to iterate through keys. But this is not as simple and straightforward as it is with the other collection types. The basic method is to use a for loop. Sep 16, 2021 · The problem is I can't iterate over the dictionary, I always just access the first one in here. This is a straightforward method, where the key from which the values have to be extracted is passed along with the index for a specific value. strip() for k, v in d. I was creating a user management application in Python; I needed a way to store the user information containing the user details, and for that, I used the dictionary. Jun 24, 2015 · I want to iterate over the dict and fetch key and value from list of values for each item, something like this {'a': 95, 'b': 643} {'a': 93, 'b': 611} {'a': 90, 'b': 610} I have implemented the logic for this and it works fine, but when i see the temp_dict created in process, i see lots of intermediate unnecessary looping. Aug 24, 2023 · In Python, to iterate through a dictionary (dict) with a for loop, use the keys(), values(), and items() methods. You can also loop through the dictionary and put the key:value pair in a list of tuples. values() returns the dictionary values. Here’s an example: Feb 2, 2023 · How can I access the dictionary's key and value and iterate over for loop? dictionary = {1: "one", 2: "two", 3: "three"} My output will be like: 1 one 2 two 3 three Sep 25, 2014 · Iterating a dictionary yields keys only. Method 1: Manually accessing the items in the list. I need it to work for any number of levels. Feb 5, 2024 · 4. Using items() to Access Keys and Values The items() method provides access to both keys and values simultaneously, simplifying code. [GFGTABS] Python a = [1, 3, 5, 7, Dec 11, 2024 · How to Iterate Over a Dictionary in Python. Apr 7, 2015 · To start with, if you are only ever going to be searching for id values, and those values are unique, you could replace your list of dictionaries with a single dictionary keyed by id: data = {1: 'James', 2: 'Robert'} With this structure, finding the name that corresponds to a given id is a trivial dictionary indexing operation: james = data[1] Mar 16, 2015 · I need to loop through the dictionary, like in a list when you can use an integer to get part of the list. You can just simply iterate the values: for value in d. startswith(" "): dic[i] = lis lis = [] if i. The sorted() function returns the list of the sorted values in Python in ascending order. _member_names_ @classmethod def values(cls): """Returns a list of all the enum values. When it comes to working with dictionaries, one common task is iterating through their key-value pairs. Jan 2, 2025 · Python provides several ways to iterate over list. Aug 9, 2023 · Using a For Loop and Dictionary Access Methods. x): May 26, 2016 · It can often be very handy to use namedtuple. In Python, iterating over a dictionary is possible through various ways that we have discussed below: Feb 12, 2019 · You can have a SuperEnum like:. How to Iterate through Dictionary Keys with a for Loop There are no guarantees that items in a dictionary with come out in any order. which helped a little, but unfortunately is the "whatever" part of the example code that I can't figure out. I would like to return an iterator Jun 24, 2018 · I'm trying to change specific datetime values in a dict into strings by recursively iterating through it's keys. But it only works for the first two levels. With the Python for loop, you can loop through dictionary keys, values, or items. This assumes you are using Python 3; in Python 2, dict. Now using nested for loop iterate over the values of keys. I only need to print out the keys and values. parse. If we want to sort the dictionary in Python and iterate over the sorted dictionary in Python by index, then we can use the sorted() function. keys(): Oct 20, 2019 · So,I need to iterate over a dictionary in python where the keys are a tuple and the values are integers. Iterate through dictionary values? 0. This method allows us to access each element in the list directly. I want to use the official gene name list to build a dictionary, then iterate over the files, determine if the gene name for each line matches the gene name in the dictionary, and if it does, append the dictionary value with the additional values from the experimental file. Which is the most efficient way to iterate through a list in python? 4. values(), and . When looping through a dictionary, the return value are the keys of the dictionary, but there are methods to return the values as well. Below, are the ways to Loop Through A List Using While Loop In In Python 3 you can use items() to get a list of tuple pairs from the dictionary. If you iterate over the dictionary itself (for team in league), you will be iterating over the keys of the dictionary. Nov 11, 2016 · You've written an outer loop over keys, then an inner loop over values, and tried to use each value as a key, which is where the program failed. Iterating over a Python dictionary allows you to access each key-value pair in the dictionary and perform operations on them. items() >>> %timeit for t in some_dict_list: t 10000 loops, best of 3: 26. name: e. As we iterate through lists or tuples using for loops in python, we can also iterate through a python dictionary using a for loop. Getting unresolved reference. Using nested for loop and exceptional handling; Using List comprehension; Method #1:Using nested for loop and exceptional handling. In this case, the container is the cars list, but you want to skip the first and last elements, so that means cars[1:-1] (python lists are zero-based, negative numbers count from the end, and : is slicing syntax. items() if isinstance(v, str) and rex. Example: Feb 22, 2024 · Method 1: Using a Simple For Loop. Jul 19, 2019 · tab. Way #2: Iterating over a dictionary's keys and values # let's assume that data_list is the following dictionary data_list = [{'Alice': 10}, {'Bob': 7}, {'Charlie': 5}] for element in data_list: for key, value in element. For example, given data = {'a': 1, 'b': 2, 'c': 3}, the output will be [1, 2, 3 Nov 23, 2024 · You can directly iterate over the keys of a Python dictionary using a for loop and access values with dict_object[key]. mydict = {'key1': [92,4], 'key2': [1,4,3], 'key3': [1,8,2], 'key4': [9925,2,4] } i want to loop through each key, exaust all values in the lists and then move to the next key. This approach requires iterating over each dictionary in the list and then accessing the desired keys and their values within the loop’s body. iteritems() except AttributeError: iterator = enumerate(obj) for reference, value in iterator: do_loop_contents(obj, reference) Aug 17, 2017 · I already loop through some_dict['data'] and then compare it's ['id'] value using this code: for item in some_dict: if item['id'] == some_value: #do stuff But with a large size dictionary, it takes a lot of time so I was curious about other ways to do what i wanted. 4, 5. You can iterate through a Python dictionary in different ways using the dictionary methods. Each value will be either a single value or a list and each list would have the same length. namedtuple('Player', 'score name') d = {'John':5, 'Alex':10, 'Richard': 7} Oct 5, 2014 · I started by iterating through the wordDict and putting each entry in the dictionary in a separate list so that it looks like this. Apr 21, 2011 · The for k, v syntax is a short form of the tuple unpacking notation, and could be written as for (k, v). Using python dictionaries in a django template. Nov 7, 2014 · Iterating over a list value in a dictionary. We can traverse the dictionary by many ways two of them are. During each iteration you get access to the key of an item in Dictionary. Choose the method that aligns with your preferences and specific requirements. You can also get a list of all the keys and values in a dictionary using those methods and list() . org Nov 22, 2024 · Iterate through Value. Aug 25, 2023 · Now that you know how to loop through dictionary values, you can easily access and manipulate them in your Python programs. we can use dictionary. Apr 27, 2023 · Time complexity: O(1) for accessing a tuple by key and O(n) for iterating through a tuple using index. Python for loops are a powerful tool, so it is important for programmers to understand their versatility. Alternatively, you can build the same list in one line using dict comprehension: Oct 15, 2013 · By using it you may not even need to iterate though the iterable since keys associated with the specified default value will be created whenever you first access them. Python Dictionary: Iterating values in a list. 2. So you can iterate over this list: for key, value in dict. I want to iterate through the keys and values in a dictionary called mydict and count them, Iterating over keys in Python dictionary. 3. pop(0) #Remove first in list of keys for key in keys: print capitals[key] Jun 12, 2012 · Say I have a list of items: x = [1, 2, 3, 4, 5] I need to perform some functions for each of these items. If the value is a dictionary I want to go into it and print out its key value pairs, etc. It is crucial to use a Python dictionary properly. {'Highland':21}. keys(); The order of the keys is determined by the implementation code and you cannot expect some specific order: Jul 14, 2024 · Dictionaries are a fundamental data structure in Python, offering a powerful way to store and organize data. We can use them to run the Aug 22, 2023 · Iterating through a Python dictionary involves looping over its keys and values. I have a dictionary called regionspointcount that holds region names (str) as the keys and a count of a type of feature within that region (int) as the values e. """ return list(cls Oct 29, 2024 · The outer loop goes through the dictionary, while the inner loop processes each list. When you do json_object[0], you're asking for the first dict in the list. These Lisp-flavored constructs are considered a little alien in Python specially after the introduction of list comprehensions in 2000. The for loop in list comprehension iterates through all the keys and values and prints all the key-value pairs in a dictionary format. keys() # keys in list a = a. The result is a list of values corresponding to the specified key across all dictionaries. Hot Network Questions Oct 2, 2020 · Each Value is a list, so you need an extra loop for iterating over the items of each list:. When you iterate over that, with for song in json_object[0]:, you iterate over the keys of the dict. iteritems() that returns an unsorted iterator for a given dictionary. from enum import Enum class SuperEnum(Enum): @classmethod def to_dict(cls): """Returns a dictionary representation of the enum. 1 us per loop Python 3 can create and iterate over items faster than Python 2 can (compare to 57. The nested list is a set of menu data. You should use map or zip – What you have is a list. Feb 14, 2024 · Whether utilizing the values() method, iterating directly over the dictionary, using the items() method, or employing list comprehension, Python offers flexibility in accessing and utilizing dictionary values. items(): print key print value If you iterate over the dictionary (without . Traverse the dictionary with list values. This means that every element of the iterated collection is expected to be a sequence consisting of exactly two elements. A Simple for Loop. For example, you have a dictionary of name and score and you want to sort on 'score': import collections Player = collections. When looping with a for loop, the behavior will be the same whether you loop over the dict (league) itself, or league. This method allows you to process or display each individual value in the dictionary without explicitly referencing the corresponding keys. Results: Speed: list comprehension > generator expression >> normal list iteration >>> filter. so, that You can iterate through tuple to get the dictionary key and value. iterating over values list in Python dictionary. items(). The specified items can be a dictionary, or an iterable object with key value pairs. Use . You can loop through a dictionary by using a for loop. In Python, these are immutable. For better performance, you should iterate over the list and check for membership in the dictionary: for k in my_list: if k in my_dict: print(k, my_dict[k]) If you want to create a new dictionary from these key-value pairs, use Mar 10, 2023 · In general, using a basic for loop to iterate through the keys of a dictionary is the fastest method of looping through a dictionary in Python. I tried this: def divide(dic): dic2 = {} for i in range(len(dic)): for j in range(len(dic[i])): dic2[i][j] = dic[i][j]/2 return dic2 Jul 29, 2022 · 7 Ways You Can Iterate Through a List in Python 1. Here are a few ways of iterating: Iterate over the keys: # create a dictionary my_dict = {'a': 1, 'b': 2, 'c': 3} # iterate over the keys and print them for key in my_dict: print(key) Output: a b c Iterate over the values: Oct 3, 2019 · If you need both keys and values, use for k, v in mydict. Method 2 : Using values() method. values() to iterate over the tuples in a dictionary with for loop. Using a Python for loop is one of the simplest methods for iterating over a list or any other sequence (e. Feb 22, 2015 · I want to write a function that can iterate over dict and list in the same way, like the following code. If you want to deal with ordering you'll need to convert the dictionary to a list. When we try to iterate over a dictionary using for loop,it implicitly calls __iter__() method. 9, 1. Here is an example: Nov 26, 2020 · Python Iterate Through Dictionary. In this article, we will discuss various approaches to create a list of dictionaries in Python using a for loop. items() # tuples of (key,value) in list Sep 11, 2017 · Normally, if you iterate over a dictionary it will only return a key, so that was the reason it error-ed out saying "Too many values to unpack". However, it does not work and blames that iter is not iterator. As noted above, you can simplify this by using list. qfevkqodutshdqorrcjnrnlztgguyihvngvacollgfwgfxupvknfxygjekgbuswhztrnswzug