I want to ignore the special characters that the user inputs in a string, while

Question

I want to ignore the special characters that the user inputs in a string, while outputting the DTMF signal sound.

Basically, I am building a DTMF encoder, which for each keypress of a telephone keypad, the system combines a row tone and a column tone and sends both.

For example: "12 34aB-cd$%^&76" should output the tones for "1234abcd76" ignoring spaces and all other characters not found on phone keypad. Is there any quicker and/or easier way to do this?

CODE:

sound_out = np.concatenate(sound)

print(sound_out)

Audio(sound_out,rate = Fs)

Explanation / Answer

You can use a dictionary

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