[Study Python] dictionary

A dictionary in Python is an unordered collection of key-value pairs, where each key maps to a value. The keys must be unique and immutable (i.e., they cannot be changed), while the values can be of any type and can be changed.
Dictionaries are implemented as hash tables, making lookups and updates efficient and fast. They are defined using curly braces {} and each key-value pair is separated by a colon :. Here's an example of creating a dictionary:

d = {'key1': 'value1', 'key2': 'value2', 'key3': 'value3'}

사전에서 키와 관련된 값을 얻으려면 다음과 같은 방식으로 접근할 수 있습니다:

value = d['key1']

동적으로 키와 값을 추가하거나 변경할 수 있습니다

d['key4'] = 'value4'
d['key1'] = 'new_value1'

사전은 또한 키와 값을 삭제할 수 있습니다:

del d['key1']