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Chapter 9: Problem 12

What does the keys method return?

Short Answer

Expert verified
Answer: The "keys()" method in Python is used with dictionaries to get a collection of all the keys present in the dictionary. To use it, simply call this method on the dictionary, like "dictionary.keys()". The result will be a list-like collection of all the keys, which can be converted into a list using the list() function.

Step by step solution

01

Understanding Dictionaries

In Python, dictionaries are a data structure that stores key-value pairs. The keys in a dictionary are unique and are used to access the corresponding values.
02

The Keys Method

The "keys()" method in Python is used with dictionaries. This method returns a list-like collection of all the keys in the dictionary. The order of the keys may not be the same as the order they were added to the dictionary.
03

Example of Keys Method

Let's look at an example of using the keys() method: dictionary = { 'a': 1, 'b': 2, 'c': 3 } key_collection = dictionary.keys() In this code, we created a dictionary with three key-value pairs. We then called the keys() method on the dictionary and stored the result in the variable 'key_collection'.
04

Interpreting the Output

The 'key_collection' variable now holds a collection of the keys in our dictionary, in this case: 'a', 'b', and 'c'. To convert this collection into a list, you can use the list() function: keys_list = list(key_collection) print(keys_list) The output will show the list of keys: ['a', 'b', 'c']

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