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[mypy] Fix type annotations for linked_stack.py, evaluate_postfix_notations.py, stack.py in data structures (#4409)

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* [mypy] Fix type annotations for linked_stack.py, next_greater_element.py, stack.py

* Reformatted files according to black
This commit is contained in:
Ahmed Haj Abdel Khaleq
2021-05-12 02:22:42 -04:00
committed by GitHub
parent 727341e3db
commit deb71167e7
3 changed files with 11 additions and 4 deletions
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6
data_structures/stacks/linked_stack.py
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@ -1,5 +1,5 @@
""" A Stack using a linked list like structure """
from typing import Any
from typing import Any, Optional
class Node:
@ -42,7 +42,7 @@ class LinkedStack:
"""
def __init__(self) -> None:
self.top = None
self.top: Optional[Node] = None
def __iter__(self):
node = self.top
@ -134,6 +134,8 @@ class LinkedStack:
"""
if self.is_empty():
raise IndexError("peek from empty stack")
assert self.top is not None
return self.top.data
def clear(self) -> None: