def scan_setup_py():
    """Validate the contents of setup.py against Versioneer's expectations."""
    found = set()
    setters = False
    errors = 0
    with open("setup.py", "r") as f:
        for line in f.readlines():
            if "import versioneer" in line:
                found.add("import")
            if "versioneer.get_cmdclass(" in line:
                found.add("cmdclass")
            if "versioneer.get_version()" in line:
                found.add("get_version")
            if "versioneer.VCS" in line:
                setters = True
            if "versioneer.versionfile_source" in line:
                setters = True
    if len(found) != 3:
        print("")
        print("Your setup.py appears to be missing some important items")
        print("(but I might be wrong). Please make sure it has something")
        print("roughly like the following:")
        print("")
        print(" import versioneer")
        print(" setup( version=versioneer.get_version(),")
        print("        cmdclass=versioneer.get_cmdclass(),  ...)")
        print("")
        errors += 1
    if setters:
        print("You should remove lines like 'versioneer.VCS = ' and")
        print("'versioneer.versionfile_source = ' . This configuration")
        print("now lives in setup.cfg, and should be removed from setup.py")
        print("")
        errors += 1
    return errors
Validate the contents of setup.py against Versioneer's expectations.