python---pop与popleft

刚接触python，对于pop与popleft的用法有些迷糊。
 首先对于pop而言，它是用于stack中的：
 eg:
 
stack=[3,4,5]
 
stack.append(6)
print(stack)
print(stack.pop(1)) #可以带参数
print(stack)
 outputs: 
 
[3, 4, 5, 6]
4
[3, 5, 6]
 
而对于pooleft是用于collections中，
eg:
 
from collections import deque
 
name=deque(["jean","li","na"])
name.append("yang")
name.append("chun")
print(name.popleft())    #不可以带参数
print(name)
 outputs:
jean
deque(['li', 'nana', 'yang', 'chun'])