Converting mobile numeric keypad numbers to its corresponding word Python

I need to create a function, where, If I give an input like 999933. It should give output as “ze”. It basically work as numeric mobile phone keypad. How can I this. I have searched to get some sample in internet. All, I got was quite opposite. Like, Giving the text as input and you will get the number. I couldn’t get the exact flow of, how to achieve that. Please let me know, how can i do that.

def number_to_text(val):

pass

Answer

You need to

• group the same digits together with the regex (d)1* that capture a digit then the same digit X times
• use the value of a digit in the group to get the key
• use the length of it to get the letter

phone_letters = ["", "", "abc", "def", "ghi", "jkl", "mno", "pqrs", "tuv", "wxyz"]

def number_to_text(val):
    groups = [match.group() for match in re.finditer(r'(d)1*', val)]
    result = ""
    for group in groups:
        keynumber = int(group[0])
        count = len(group)
        result += phone_letters[keynumber][count - 1]
    return result


print(number_to_text("999933")) # ze

Using list comprehension

def number_to_text(val):
    groups = [match.group() for match in re.finditer(r'(d)1*', val)]
    return "".join(phone_letters[int(group[0])][len(group) - 1] for group in groups)