Publishes Formic to PyPi (don't run unless you are the maintainer)

def publish():
    """Publishes Formic to PyPi (don't run unless you are the maintainer)"""
    print("To be ready for release, remember:")
    print("      1) Update the version number (and associated test)")
    print("      2) Update the ChangeLog.rst (and other documentation)")
    print(
        "         ChangeLog should have an line (title) consisting of the version number"
    )
    print("      3) Tag Mercurial with 'Release <version>'")
    print("      4) Push updates to BitBucket")
    print("      5) Set the RELEASE environment variable")
    print("           $ export RELEASE=formic")

    cmd = [
        'bash', '-c',
        'yolk -M formic | grep "^version: " | sed "s/^version: \\(.*\\)$/\\1/"'
    ]
    published_version = subprocess.check_output(cmd).strip()
    our_version = open(os.path.join("formic", "VERSION.txt"), "r").read()

    # sanity test on version
    if "\n" in published_version or\
       len(published_version) < 3 or len(published_version) > 10:
        raise Exception(
            "Published version number seems weird: " + published_version)

    print("Published version:", published_version)
    print("Current version:  ", our_version)

    if our_version == published_version:
        raise Exception(
            "You are attempting to republish version " + our_version)

    # sanity: check ChangeLog starts with our version
    changelog = open("CHANGELOG.rst", "r")
    found = False
    for line in changelog.readlines():
        if line.strip() == our_version:
            print("ChangeLog has an entry")
            found = True
            break
    changelog.close()
    if not found:
        raise Exception(
            "The ChangeLog does not appear to include comments on this release"
        )

    # Sanity check: is there a release tag
    tags = subprocess.check_output("hg tags".split())
    found = False
    looking_for = "Release " + our_version
    for line in tags.split("\n"):
        match = re.match(r"^(.*)\s+[0-9]+:[0-9a-f]+$", line)
        if match:
            tag = match.group(1).strip()
            if tag == looking_for:
                print("Found tag", tag)
                found = True
                break

    if not found:
        raise Exception(
            "Mercurial does not have the release tag: " + looking_for)

    status = subprocess.check_output(["hg", "status"])
    for line in status.split("\n"):
        if len(line) > 0:
            raise Exception("Uncommitted changes present")

    try:
        v = os.environ["RELEASE"]
        if v != "formic":
            raise KeyError()
    except KeyError:
        print("$RELEASE environment variable is not set")
        raise

    subprocess.check_call("python setup.py bdist_egg upload".split())
    subprocess.check_call("python setup.py sdist upload".split())