Write Versioned Python Packages to Requirements File for Uninstallation

write_pkg_requirements.py

import re

"""This script prepares a stream of text (captured during a Terminal session).
The text represents the named package installations of `pyttsx3` and its
113 versioned dependencies.

The captured stream of text (copy & paste) was saved to the `trash_pkgs.txt`
file. This script transforms its contents to specification and writes a
`requirements.txt` file. The requirements file is used by the command:

`python3 -m pip uninstall -r requirements.txt`

`pipdeptree` verifies that only the captured dependencies, mentioned above,
apply to the `pyttsx3` package installation."""

with open("trash_pkgs.txt", "r") as trash_file:
    pkgs = trash_file.read()
trash_file.close()

# create requirements.txt file
req_file = open("requirements.txt", "wt")

# package names end with version number
p = re.compile(r"\-\d+\.\d+")

# split space delimited named packages to list
pkg_list = pkgs.split()
for pkg in pkg_list:
    # modify version delimiter
    verNum = p.findall(pkg)[0]
    verDlm = verNum.replace("-", "==")

    # replace '-6.1' with '==6.1'
    pkgV = pkg.replace(verNum, verDlm)
    # write replacement to requirements.txt
    req_file.write(("{0}\n").format(pkgV))

req_file.close()