Question

I have a logger that listens to sequences such as equations, but I need to remove all the keypresses like “L_control” or “shift”, what I do is get the ascii number and then use chr(event.Ascii) but it comes back with the ctrl and shift presses as a space.

I’m currently using this to remove all the characters I don’t want but it doesn’t seem to work. Any ideas of improvements?

def removeChars(l):
    acceptedChars = ["[", "]", "+", "-", "/", "*", "^", "*", "(", ")"]
    newL = ""
    for x in range(0, len(l)):
        if l[x].isalpha() or l[x] in acceptedChars or l[x].isdigit():
            newL = newL + l[x]
    return newL

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Edit:

I am using pyHook to get the key event and using event.Ascii to get the Ascii value then using chr(event.Ascii) to get the character

Answer 1

What about something like this?

import string
acceptedChars = set(string.printable)
newL = ''.join([ x for x in l if x in acceptedChars])

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Edit:

You can use anything in set() to match to for example to just get digits, letters, and selected symbols:

acceptedChars = set(string.digits + "[]()+-/*^=!<>" + string.letters)
newL = ''.join([ x for x in l if x in acceptedChars])