Python dictionary keys as list: Dictionaries are Python’s implementation of an associative list, which may be a arrangement . A dictionary may be a collection of key-value pairs that are stored together. A key and its value are represented by each key-value pair.
Examples:
Input:
dictionary = {'This': 100, 'is': 200, 'BTechGeeks': 300}
Output:
['This', 'is', 'BTechGeeks']
- What is a Dictionary in Python and why do we need it
- Convert Dictionary keys to a List in Python
- Python Dictionary: Values() Function
Create a List of all keys of a Dictionary
There are several ways to create a list of all keys of a dictionary some of them are:
Method #1:Using keys() +list() function
The dictionary class in Python has a member function called dict.keys ()
It returns a view object or an iterator that iterates through the list of all keys in the dictionary. This object can be used for iteration or to create a new list.
Below is the implementation:
# Given dictionary
dictionary = {'This': 100, 'is': 200, 'BTechGeeks': 300}
# converting the keys of dictionary using keys() +list() function
keyslist = list(dictionary.keys())
# print the list of keys
print(keyslist)
Output:
['This', 'is', 'BTechGeeks']
Method #2 :Using unpacking (*args)
Unpacking with * works with any iterable object, and because dictionaries return their keys when iterated through, it is simple to create a list by using it within a list literal.
Below is the implementation:
# Given dictionary
dictionary = {'This': 100, 'is': 200, 'BTechGeeks': 300}
# converting the keys of dictionary using args(*) function
keyslist = [*dictionary]
# print the list of keys
print(keyslist)
Output:
['This', 'is', 'BTechGeeks']
Method #3 :Using List Comprehension
We can convert to list using list comprehension in a single line.
Below is the implementation:
# Given dictionary
dictionary = {'This': 100, 'is': 200, 'BTechGeeks': 300}
# converting the keys of dictionary using list comprehension
keyslist = [key for key in dictionary]
# print the list of keys
print(keyslist)
Output:
['This', 'is', 'BTechGeeks']
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