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Fixes #8754, #8724 Updated postfix_evaluation.py

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postfix_evaluation.py now supports Unary operators and floating point numbers.
Also merged evaluate_postfix_notations.py and postfix_evaluation.py into postfix_evaluation.py which fixes #8724. Added a doctest example with unary operator and invalid expression.
This commit is contained in:
Arijit De 2023-08-23 16:33:01 +05:30
parent 9a15148f8b
commit c11b18fed8
1 changed files with 3 additions and 3 deletions
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6
data_structures/stacks/postfix_evaluation.py
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@ -31,7 +31,7 @@ UNARY_OP_SYMBOLS = ("-", "+")
BINARY_OP_SYMBOLS = ("-", "+", "*", "^", "/")
def parse_token(token: str | float) -> float | str:
def parse_token(token: str) -> float | str:
"""
Converts the given data to appropriate number if it is indeed a number, else returns
the data as it is with a False flag. This function also serves as a check of whether
@ -39,7 +39,7 @@ def parse_token(token: str | float) -> float | str:
Parameters
----------
token : str or float
token : str
The data which needs to be converted to the appropriate number
Returns
@ -63,7 +63,7 @@ def is_operator(token: str | float) -> bool:
Parameters
----------
token : str
token : str or float
The value that needs to be checked for operator
Returns