Run this + poetry update after it in git post-merge hook to sync requirements.txt to working Poetry environment automatically

update-poetry.py

import tempfile
import re

def write_requirements(target_file):
    with open("requirements.txt", "r") as deps:
        for depline in deps:
            m = re.search("^(.+)==(.+)$", depline)
            target_file.write(m.group(1) + " = \"" + m.group(2) + "\"\n")

if __name__ == '__main__':
    tmp = tempfile.NamedTemporaryFile()

    match_start = "[tool.poetry.dependencies]\n"
    match_end = "\n"
    in_match = False
    skip = -1

    # replace contents of pyproject.toml by "ranking" each line with the skip counter:
    with open(tmp.name, "w") as temp, open("pyproject.toml", "r") as source:
        for line in source:
            if line == match_start:
                in_match = True
                skip = 3
            if in_match == True and line == match_end:
                # convert requirements.txt to poetry style dependency definitions
                write_requirements(temp)
                in_match = False
                skip = 0

            if skip != 1:
                temp.write(line)

            if skip > 1:
                skip -= 1

    with open(tmp.name, "r") as temp, open("pyproject.toml", "w") as target:
        target.write(temp.read())