Fix type annotations for stack.py (#5566)

2021-10-26 11:33:08 -07:00
parent 582f57f41f
commit c0ed031b3f
4 changed files with 15 additions and 11 deletions
--- a/data_structures/stacks/infix_to_postfix_conversion.py
+++ b/data_structures/stacks/infix_to_postfix_conversion.py
@@ -38,7 +38,7 @@ def infix_to_postfix(expression_str: str) -> str:
    """
    if not balanced_parentheses(expression_str):
        raise ValueError("Mismatched parentheses")
-    stack = Stack()
+    stack: Stack[str] = Stack()
    postfix = []
    for char in expression_str:
        if char.isalpha() or char.isdigit():