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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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4
data_structures/stacks/evaluate_postfix_notations.py
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@@ -1,3 +1,5 @@
from typing import Any, List
"""
The Reverse Polish Nation also known as Polish postfix notation
or simply postfix notation.
@@ -21,7 +23,7 @@ def evaluate_postfix(postfix_notation: list) -> int:
return 0
operations = {"+", "-", "*", "/"}
stack = []
stack: List[Any] = []
for token in postfix_notation:
if token in operations: