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in python, how do i check if an user boolean input is true or false (lemmy.ml)

submitted 9 months ago by [email protected] to c/[email protected]

18 comments fedilink hide all child comments

to my knowledge, if you input any text it will return true and if you input nothing it will return false. if it's possible without if statements, how do i check if they inputted 'True' or 'False (/ '1' or '0') when im doing 'bool(input("Input True or False ")'.

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[–] [email protected] 2 points 9 months ago* (last edited 9 months ago) (9 children)

Without if statements?

Apologies typing on my phone

def input_checker(input_str):

input_str = input_str.lower()

validation_dict = {“true”: “they input true”,
                               “false”: “they input false”}

return validation_dict.get(input_str, “They input something else”)

You are comparing the content of strings, not their truth value. A string is true if it’s not empty and false if it is. The string “True” is no closer to the bool True than the string “Oranges” is.

What you are looking for is input validation. Check the content of what they wrote and respond accordingly.

[–] [email protected] 0 points 9 months ago (8 children)

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?)

[–] [email protected] 5 points 9 months ago* (last edited 9 months ago) (1 children)

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.

[–] [email protected] 1 points 9 months ago

Always trust user input'); DROP TABLE users;

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