this post was submitted on 13 Sep 2023
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Asklemmy
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why is my input being seen as a string in the firsr place if i typecasted the variable as a boolean? how do i make the input itself a bool (rather than the variable?)
User inputs are strings, which can be anything. You are hoping they input True or false but what if they input tRUe or FALSE77 or Hunter4 or jgidqopqncb uriwnsvsveyqiaoNcbtjwnak? bool(“tRUe”) doesn’t evaluate to True or False in the way you think it does.
If you want to convert user input to a bool use a lookup dict with some validation rules (like lower casing input text) to sanitize the input. I cannot emphasize this enough - never trust user input.
Always trust user input'); DROP TABLE users;
Worth remembering that python uses the concepts of truthy and falsey. Empty string ("") is falsey. Any other string ("true", "false", "0", etc.) Is truthy. All bool(str) does is evaluate whether str is truthy or falsey. It does not evaluate what str actually is.
So bool(input("Input True or False ") will return False is the user input is empty and True otherwise.
You can use eval(input). It converts string to whatever the actual content is.
Which is really bad if the user inputs executable code. Never call eval on unsanitized text
wait so eval(bool(input('Input:')
Yeah, don’t do that. Users could accidentally or maliciously type something that would get executed as python code and break your program