헷갈렸던 부분

• dictionary를 pop 했을때 파라미터로 key값을 받는다면 value만 남을것이라는 말도 안되는 생각을 가지고 있었음
  -> 정답: 그 dictionary의 key-value가 통째로 없어진다.

Dictionary pop을 한다면?

• 그 key-value pairs는 없어진다
• pop할때 새로운 변수에 assign을 한다면 value가 assign되고, 그 딕셔너리의 key value pairs는 사라진다.

ex)

# random sales dictionary
sales = { 'apple': 2, 'orange': 3, 'grapes': 4 }

element = sales.pop('apple')

print('The popped element is:', element)
print('The dictionary is:', sales)

Output

The popped element is: 2
The dictionary is: {'orange': 3, 'grapes': 4}

Syntax

Syntax of Dictionary pop()
The syntax of pop() method is

dictionary.pop(key[, default])

pop() method takes two parameters:

• key - key which is to be searched for removal
• default - default value which is to be returned when the key is not in the dictionary

Return value from pop()

The pop() method returns:

If key is found - removed/popped element from the dictionary
If key is not found - value specified as the second argument (default)
If key is not found and default argument is not specified - KeyError exception is raised

출처: https://www.programiz.com/python-programming/methods/dictionary/pop