Extracting Dictionary Keys in Python

Introduction

In Python, a dictionary is a collection of key-value pairs. Each key is unique and is used to access its corresponding value. Sometimes, we may need to extract only the keys from a dictionary. In this challenge, you are tasked with creating a function that takes a flat dictionary as input and returns a list of all its keys.

Dictionary Keys

Write a function keys_only(flat_dict) that takes a flat dictionary as input and returns a list of all its keys.

To solve this problem, you can follow these steps:

1. Use dict.keys() to return the keys in the given dictionary.
2. Return a list() of the previous result.

def keys_only(flat_dict):
  return list(flat_dict.keys())

ages = {
  'Peter': 10,
  'Isabel': 11,
  'Anna': 9,
}
keys_only(ages) ## ['Peter', 'Isabel', 'Anna']

Summary

In this challenge, you have learned how to extract only the keys from a dictionary in Python. You can use the dict.keys() method to return the keys and then convert the result to a list.