Don't import argparse twice.

from os import environ

import sys

import argparse

from argparse import ArgumentParser

import template.filters

# I ignore import errors here and fail on them later in the main function so

def main():

    """Main entrypoint."""

    parser = ArgumentParser(description=__doc__)

    parser = argparse.ArgumentParser(description=__doc__)

    parser.add_argument(

        "filename",

        help="Input filename",