There is no such function; the easiest way to do this is to use a dict comprehension:
my_dictionary = {k: f(v) for k, v in my_dictionary.items()}
Note that there is no such method on lists either; you'd have to use a list comprehension or the map() function.
As such, you could use the map() function for processing your dict as well:
my_dictionary = dict(map(lambda kv: (kv[0], f(kv[1])), my_dictionary.items()))
but that's not that readable, really.
(Note that if you're still using Python 2.7, you should use the .iteritems() method instead of .items() to save memory. Also, the dict comprehension syntax wasn't introduced until Python 2.7.)
Top answer 1 of 10
528
There is no such function; the easiest way to do this is to use a dict comprehension:
my_dictionary = {k: f(v) for k, v in my_dictionary.items()}
Note that there is no such method on lists either; you'd have to use a list comprehension or the map() function.
As such, you could use the map() function for processing your dict as well:
my_dictionary = dict(map(lambda kv: (kv[0], f(kv[1])), my_dictionary.items()))
but that's not that readable, really.
(Note that if you're still using Python 2.7, you should use the .iteritems() method instead of .items() to save memory. Also, the dict comprehension syntax wasn't introduced until Python 2.7.)
2 of 10
42
These toolz are great for this kind of simple yet repetitive logic.
http://toolz.readthedocs.org/en/latest/api.html#toolz.dicttoolz.valmap
Gets you right where you want to be.
import toolz
def f(x):
return x+1
toolz.valmap(f, my_list)
GeeksforGeeks
geeksforgeeks.org › python › python-mapping-key-values-to-dictionary
Python - Mapping Key Values to Dictionary - GeeksforGeeks
July 12, 2025 - For example, we are given two list k = ['a', 'b', 'c'] and v = [1, 2, 3] we need to map the keys of list k to the values of list v so that the resultant output should be {'a': 1, 'b': 2, 'c': 3}. zip() function pairs elements from two lists ...
Videos
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Mapping of Dictionary
Map values of a list to a dictionary in Python
Python Like You Mean It
pythonlikeyoumeanit.com › Module2_EssentialsOfPython › DataStructures_II_Dictionaries.html
Data Structures (Part II): Dictionaries — Python Like You Mean It
A nice syntax for creating a dictionary is to specify key-value pairs inside “curly braces”: {key1:value1, key2:value2, ...}. As an example, let’s construct a dictionary that maps types of foods to “fruit” or “vegetable”. We’ll start by mapping “apple” to “fruit”, and ...
Real Python
realpython.com › python-mappings
Python Mappings: A Comprehensive Guide – Real Python
July 23, 2024 - As shown in this example, you can’t use a list as a key in a dictionary since lists are mutable and not hashable. And even though number_groups is a tuple, you can’t use it to create a Counter object since the tuple contains lists. Mappings are not an ordered data structure. However, items in dictionaries maintain the order in which they were added. This feature has been present since Python 3.6, and it was added to the formal language description in Python 3.7.
w3resource
w3resource.com › python-exercises › dictionary › python-data-type-dictionary-exercise-70.php
Python: Map dictionary - w3resource
return dict(zip(itr, map(fn, itr))) # Call the 'test' function with an iterable [1, 2, 3, 4] and a lambda function that squares its input. # The lambda function calculates the square of each element in the iterable. result = test([1, 2, 3, 4], ...
DigitalOcean
digitalocean.com › community › tutorials › how-to-use-the-python-map-function
Ultimate Guide to Python Map Function for Data Processing | DigitalOcean
December 18, 2024 - In the same way as lambda functions ... in another iterable name following the first one. For example, using the pow() function that takes in two numbers to find the power of the base number to the provided exponent....
TechBeamers
techbeamers.com › python-map-function
Python Map Function - TechBeamers
November 30, 2025 - Dict key is 'Java' and value is 0. Dict key is 'CSharp' and value is 0. Dict key is 'Python' and value is 0. Type of map_result is <class 'map'> Lengths are: 4 6 6 · The program prints the length of dictionary keys. From here, learn more about dictionaries in Python.
30 Seconds of Code
30secondsofcode.org › home › python › map dictionary values
Python - Map dictionary values - 30 seconds of code
August 3, 2024 - And that's it! def map_values(obj, fn): return dict((k, fn(v)) for k, v in obj.items()) users = { 'fred': { 'user': 'fred', 'age': 40 }, 'pebbles': { 'user': 'pebbles', 'age': 1 } } map_values(users, lambda u : u['age']) # {'fred': 40, 'pebbles': 1}
Medium
medium.com › @dsjayamal › python-mapping-dictionary-to-class-attributes-1a3786f05fe5
Python: Mapping Dictionary to Class Attributes | by Danushaka Dissanayaka | Medium
July 7, 2024 - # Example dictionary _dictionary = {'_id':'uid', 'name': 'Bob', 'age': 23, 'title': 'SSE', 'department': 'SWE', 'image': 'bob.jpg'} employee = Employee(_dictionary) print(employee.name) # Bob print(employee.image) # http://example.com/image...
Python documentation
docs.python.org › 3 › tutorial › datastructures.html
5. Data Structures — Python 3.14.3 documentation
Another useful data type built into Python is the dictionary (see Mapping Types — dict).
Open Book Project
openbookproject.net › thinkcs › python › english3e › dictionaries.html
20. Dictionaries — How to Think Like a Computer Scientist: Learning with Python 3
Dictionaries have a number of useful built-in methods. The keys method returns what Python 3 calls a view of its underlying keys. A view object has some similarities to the range object we saw earlier — it is a lazy promise, to deliver its elements when they’re needed by the rest of the program. We can iterate over the view, or turn the view into a list like this: ... Got key three which maps to value tres Got key two which maps to value dos Got key one which maps to value uno ['three', 'two', 'one']
Medium
medium.com › road-to-full-stack-data-science › python-map-function-with-dictionaries-61087f418795
Python map function with dictionaries | by Tasos Pardalis | Road to Full Stack Data Science | Medium
October 18, 2022 - I spent far too much time working on a data engineering task that I could have completed in a day or two if I had used a dictionary and the map function. ... “Python’s map() is a built-in function that allows you to process and transform all the items in an iterable without using an explicit ...
W3Schools
w3schools.com › python › python_dictionaries.asp
Python Dictionaries
Dictionary is a collection which is ordered** and changeable. No duplicate members. *Set items are unchangeable, but you can remove and/or add items whenever you like. **As of Python version 3.7, dictionaries are ordered.
dbader.org
dbader.org › blog › python-dictionaries-maps-and-hashtables
Dictionaries, Maps, and Hash Tables in Python – dbader.org
April 18, 2017 - Using get() to return a default value from a Python dict – Python’s dictionaries have a “get” method to look up a key while providing a fallback value. This short screencast tutorial gives you a real-world example where this might come in handy.
Manning Publications
livebook.manning.com › book › get-programming › chapter-27
Lesson 27. Dictionaries as maps between objects · Get Programming: Learn to code with Python
October 11, 2024 - In figure 27.1, the grocery dictionary now maps an item to its quantity.
LabEx
labex.io › tutorials › python-how-to-efficiently-map-values-to-a-new-dictionary-in-python-398185
How to efficiently map values to a new dictionary in Python | LabEx
## Example: Mapping numbers to their squares numbers = [1, 2, 3, 4, 5] squared_numbers = {num: num ** 2 for num in numbers} print(squared_numbers) ## Output: {1: 1, 2: 4, 3: 9, 4: 16, 5: 25}
Python
docs.python.org › 2.5 › lib › typesmapping.html
3.8 Mapping Types -- dict
Dictionaries are created by placing a comma-separated list of key: value pairs within braces, for example: {'jack': 4098, 'sjoerd': 4127} or {4098: 'jack', 4127: 'sjoerd'}. The following operations are defined on mappings (where a and b are mappings, k is a key, and v and x are arbitrary objects): ...
Medium
medium.com › pythoneers › understanding-how-maps-work-in-python-ce7102539bad
Understanding How Maps Work in Python | by Rajat Sharma | The Pythoneers | Medium
April 13, 2024 - Creating a map, or dictionary, in Python is straightforward. You can initialize an empty dictionary or create one with predefined key-value pairs using curly braces {} and colons : to separate keys and values, respectively. Here's an example:
Real Python
realpython.com › python-dicts
Dictionaries in Python – Real Python
December 16, 2024 - In this example, "color" is a key, and "green" is the associated value. Dictionaries are a fundamental part of Python. You’ll find them behind core concepts like scopes and namespaces as seen with the built-in functions globals() and locals(): ... The globals() function returns a dictionary containing key-value pairs that map names to objects that live in your current global scope.
Stack Exchange
gis.stackexchange.com › questions › 315895 › passing-dictionary-to-map-function
python - Passing dictionary to map function - Geographic Information Systems Stack Exchange
If analysis_function doesn't use Earth Engine API functions but local libraries then no, you won't be able to call it from inside a map function.