[Solved] Why I can’t delete everything except for certain characters using a loop

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Its because you’re using a list comprehension, instead you just have to have that replace function, like this…

def printer_error(s):
    allowed = "abcdefghijklm"

    for char in s:
        if char not in allowed:
            s = s.replace(char, "")

    return s
print(printer_error("xyzabcdef"))

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solved Why I can’t delete everything except for certain characters using a loop