python to python adds unnecessary imports
going from 
```py
def add_numbers(a, b):
    return a + b


def sub_numbers(a, b):
    return a - b


def gcd(a, b):
    while b:
        a, b = b, a % b
    return a


def is_prime(n):
    if n <= 1:
        return False
    if n <= 3:
        return True
    if n % 2 == 0 or n % 3 == 0:
        return False
    i = 5
    while i * i <= n:
        if n % i == 0 or n % (i + 2) == 0:
            return False
        i += 6
    return True
```
using
`python py2many.py --python=1 untyped.py --force`

we get
```py
from typing import Callable, Dict, List, Set, Optional
from ctypes import c_int8 as i8, c_int16 as i16, c_int32 as i32, c_int64 as i64
from ctypes import c_uint8 as u8, c_uint16 as u16, c_uint32 as u32, c_uint64 as u64
import sys


def add_numbers(a, b):
    return a + b


def sub_numbers(a, b):
    return a - b


def gcd(a, b):
    while b:
        a, b = (b, a % b)
    return a


def is_prime(n) -> bool:
    if n <= 1:
        return False
    if n <= 3:
        return True
    if n % 2 == 0 or n % 3 == 0:
        return False
    i: int = 5
    while i * i <= n:
        if n % i == 0 or n % (i + 2) == 0:
            return False
        i += 6
    return True
```