Wordlist with Specific Characters Generator (Python 3.5+ crunch). 3.5+ Because of Annotations, Just remove them for Python 2 or < 3.5

crunchy.py

import itertools
import string
from typing import List, Union


class crunch:
    char_list: List[str] = list(string.ascii_uppercase) + list(string.ascii_lowercase) + list(string.digits)
    min: int = 1
    max: int = 6
    resume: Union[None, str] = None

    def __init__(self, char_list: Union[str, list] = None, min_length: int = None, max_length: int = None, resume: str = None):

        if char_list:
            assert isinstance(char_list, (str, list))
            if isinstance(char_list, list):
                self.char_list = char_list
            if isinstance(char_list, str):
                self.char_list = char_list.split()
        if min_length:
            assert isinstance(min_length, int)
            self.min = min_length
        if max_length:
            assert isinstance(max_length, int)
            self.max = max_length
        if resume:
            assert isinstance(resume, str)
            self.resume = resume

    def iterator(self) -> iter:

        # Warning Resume takes a while as it has to iterate back to the `resume == it`
        for r in range(self.min, self.max):
            for it in map("".join, itertools.product(self.char_list, repeat=r)):
                if self.resume is not None and self.resume != it:
                    continue
                elif self.resume == it:
                    self.resume = None
                yield it

    def __iter__(self) -> iter:
        return self.iterator()

    def __enter__(self) -> iter:
        return self.iterator()

    def __exit__(self, exc_type, exc_val, exc_tb):
        pass