Find Meaning for Phone Number

main.py

numToLetter = {"1": ("_"),
	"2": ("A", "B", "C"),
	"3": ("D", "E", "F"),
	"4": ("G", "H", "I"),
	"5": ("J", "K", "L"),
	"6": ("M", "N", "O"),
	"7": ("P", "Q", "R", "S"),
	"8": ("T", "U", "V"),
	"9": ("W", "X", "Y", "Z"),
	"0": ("+")}
vowels = ("A", "I", "U", "E", "O", "Y", "V")
phoneNumber = input("Enter your phone number, digits only (preferably 4 digits): ")
length = len(phoneNumber)
def analyzeTheRestDigits(previousString = "", theRestDigits = "", needVowel = False):
	'''Prints all possible pronounciable combinations.'''
	usableLetters = numToLetter[theRestDigits[0]]
	thisLength = len(previousString)+1
	for letter in usableLetters:
		thisString = previousString+letter
		if needVowel:
			if letter in vowels:
				if thisLength == length: print(thisString)
				if len(theRestDigits)>1: analyzeTheRestDigits(thisString, theRestDigits[1:], needVowel = False)
		else: #a consonant is also okay
			if thisLength == length: print(thisString)
			if len(theRestDigits)>1: analyzeTheRestDigits(thisString, theRestDigits[1:], needVowel = True)

if length>0: analyzeTheRestDigits(theRestDigits = phoneNumber)