ASP .NET Core using statements sort git precommit hook

pre-commit

#!/usr/bin/python3.7
import subprocess
import re
from collections import defaultdict

stagedFiles = subprocess.run(["git", "diff", "--cached", "--name-only", "--diff-filter=ACM"], capture_output=True, text=True).stdout.strip().split("\n")

def sortLines(lines):
    d = defaultdict(list)
    zipped = [(x[6:x.index(".")], x) for x in lines]
    [d[k].append(v) for (k, v) in zipped]
    for (k, v) in d.items():
        v.sort(key=lambda x: len(x), reverse=True)
    return [item for (k, v) in sorted(d.items(), key=lambda i: i[0]) for item in v]
    

prog = re.compile(r"^using .*;$", re.MULTILINE)

exitCode = 0
changedFiles = list()

for stagedFile in stagedFiles:
    rf = ""
    with open(stagedFile, "r") as file:
        readfile = file.read()
        usingLines = prog.findall(readfile)
        usingLinesCopy = usingLines.copy()
        sortedUsingLines = sortLines(usingLines)
        if usingLinesCopy == sortedUsingLines:
            continue
        exitCode = 1
        newUsings = "\n".join(sortedUsingLines)
        rf = newUsings + "\n" + "\n".join(readfile.split("\n")[len(sortedUsingLines):])
    file.close()
    with open(stagedFile, "w") as wfile:
        wfile.write(rf)
        changedFiles.append(stagedFile)
    wfile.close()

for cf in changedFiles:
    print("  => File Changed:", cf)

exit(exitCode)