converting individual digits to string

Question

I think i\'m very close but i cant seem to fix my issues. I need a function that takes a 10-digit input from user (me) and sets each letter to is numeric value.

Example:

Answer 1

You can create a formula to ascertain the correct number to add depending on the letter:

math.ceil((index(char)+1)/3)

Use a list and depending on which character it is, append a number to the list. At the end, return the list, but joined so that it is a string:

def numerify(inp):
        from math import ceil as _ceil
        from string import lowercase as _lowercase
        chars = []
        for char in inp:
                if char.isalpha():
                        num = _ceil((_lowercase.index(char)+1)/float(3))
                        chars.append(str(int(num+1)))
                else:
                        chars.append(char)
        return ''.join(chars)

---

>>> from numerify import numerify
>>> numerify('1')
'1'
>>> numerify('941-019-abcd')
'941-019-2223'
>>>