按要求进入 ginger 目录，并拷贝了Pipfile文件，然后执行pipenv install ，报下边的错误（以下为完整报错）， python 版本 3.6.7

Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pipenv/project.py", line 527, in _parse_pipfile
    return tomlkit.parse(contents)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pipenv/vendor/tomlkit/api.py", line 49, in parse
    return Parser(string).parse()
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pipenv/vendor/tomlkit/parser.py", line 146, in parse
    key, value = self._parse_table()
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pipenv/vendor/tomlkit/parser.py", line 958, in _parse_table
    item = self._parse_item()
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pipenv/vendor/tomlkit/parser.py", line 270, in _parse_item
    return self._parse_key_value(True)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pipenv/vendor/tomlkit/parser.py", line 339, in _parse_key_value
    raise self.parse_error(EmptyKeyError)
tomlkit.exceptions.EmptyKeyError: Empty key at line 21 col 0

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.6/bin/pipenv", line 11, in <module>
    sys.exit(cli())
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 764, in __call__
    return self.main(*args, **kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 717, in main
    rv = self.invoke(ctx)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 1137, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 956, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pipenv/vendor/click/decorators.py", line 64, in new_func
    return ctx.invoke(f, obj, *args, **kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pipenv/vendor/click/decorators.py", line 17, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pipenv/cli/command.py", line 254, in install
    editable_packages=state.installstate.editables,
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pipenv/core.py", line 1741, in do_install
    pypi_mirror=pypi_mirror,
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pipenv/core.py", line 574, in ensure_project
    pypi_mirror=pypi_mirror,
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pipenv/core.py", line 494, in ensure_virtualenv
    python = ensure_python(three=three, python=python)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pipenv/core.py", line 394, in ensure_python
    python = project.required_python_version
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pipenv/project.py", line 243, in required_python_version
    required = self.parsed_pipfile.get("requires", {}).get(
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pipenv/project.py", line 509, in parsed_pipfile
    parsed = self._parse_pipfile(contents)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pipenv/project.py", line 531, in _parse_pipfile
    return toml.loads(contents)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pipenv/vendor/toml/decoder.py", line 227, in loads
    original, i)
toml.decoder.TomlDecodeError: Found invalid character in key name: '('. Try quoting the key name. (line 21 column 11 char 317)