The Boolean Any And All Operators in Python are Great for Input Validation

The aim of this page📝is to describe any and all boolean operators in python and a single simple use case: input validation, particularly if part of an input can be found in any of the list items (e.g. folder names).

• any and all are equivalent to the logical operators and and or
• they are specifically used for iterable series of [bool] values.
• any takes an iterable and tells you if any elements in it are true.
• all takes an iterable and tells you if all the elements in it are true.

• this is amazing for validation of input
• my case is checking if a list of strings contains a substring which is an ID
• only if the ID has not been used yet, I proceed with the function, else I raise a ValueError
• if the first 2 characters of a selected name are found in the sectionFolders list of folders, it is over

if any([name[:2] in folder for folder in sectionFolders]):
        raise ValueError(
            f"ID already used, select a proper one"
        )

SOURCES

• How to check if a list contains a substring in Python