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Pyupgrade to Python 3.9 (#4718)

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* Pyupgrade to Python 3.9

* updating DIRECTORY.md

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This commit is contained in:
Christian Clauss
2021-09-07 13:37:03 +02:00
committed by GitHub
parent 5d5831bdd0
commit cecf43d648
142 changed files with 523 additions and 530 deletions
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7
data_structures/stacks/evaluate_postfix_notations.py
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@ -1,5 +1,3 @@
from typing import Any, List
"""
The Reverse Polish Nation also known as Polish postfix notation
or simply postfix notation.
@ -8,6 +6,9 @@ Classic examples of simple stack implementations
Valid operators are +, -, *, /.
Each operand may be an integer or another expression.
"""
from __future__ import annotations
from typing import Any
def evaluate_postfix(postfix_notation: list) -> int:
@ -23,7 +24,7 @@ def evaluate_postfix(postfix_notation: list) -> int:
return 0
operations = {"+", "-", "*", "/"}
stack: List[Any] = []
stack: list[Any] = []
for token in postfix_notation:
if token in operations: