使用字典优化命令行参数处理

if len(sys.argv) == 2:
    all_templates = ('template1', 'template2', 'template3', 'template4')
    if not sys.argv[1].startswith(all_templates):
        sys.exit("""Usage:  python build.py --template1
​
""")
    if sys.argv[1].startswith('--'):
        option = sys.argv[1][2:]
        templates = {
            'template1': ('static/template-1/header', 'static/template-1/header_forum', 'static/template-1/header_search', 'static/template-1/header_archive', 'static/template-1/footer_post', 'static/template-1/footer'),
            'template2': ('static/template-2/header', 'static/template-2/header_forum', 'static/template-2/header_search', 'static/template-2/header_archive', 'static/template-2/footer_post', 'static/template-2/footer'),
            'template3': ('static/template-3/header', 'static/template-3/header_forum', 'static/template-3/header_search', 'static/template-3/header_archive', 'static/template-3/footer_post', 'static/template-3/footer'),
            'template4': ('static/template-4/header', 'static/template-4/header_forum', 'static/template-4/header_search', 'static/template-4/header_archive', 'static/template-4/footer_post', 'static/template-4/footer')
        }
        template_files = templates[option]
        for file in template_files:
            hf = staticFile(file)
            header = hf()
            header = string.replace(header, "site_description", Settings.site_description)
            fh = staticFile(file)
            forum_header = fh()
            forum_header = string.replace(forum_header, "site_description", Settings.site_description)
            sh = staticFile(file)
            search_header = sh()
            search_header = string.replace(search_header, "site_description", Settings.site_description)
            ah = staticFile(file)
            archive_header = ah()
            archive_header = string.replace(archive_header, "site_description", Settings.site_description)
            fp = staticFile(file)
            footer_p = fp()
            footer_p = string.replace(footer_p, "footer_text", Settings.footer_text)
            fi = staticFile(file)
            footer_i = fi()
            footer_i = string.replace(footer_i, "footer_text", Settings.footer_text)
elif len(sys.argv) < 2:
    sys.exit("""Usage:  python build.py --template1
​
""")
elif len(sys.argv) > 2:
    sys.exit("""Usage:  python build.py --template1
​
""")
else:
    sys.exit("""Usage:  python build.py --template1
​
""")