Question

我正在尝试使用pytest的json将一些命令行参数从argparse.ArgumentParser实例移植到等效的pytest conftest.py文件中

查看pytest帮助功能，我发现有12个使用的单字符短选项，即pytest_addoption

k, m, x, c, s, v, q, r, l, h, p, o

但是，如果我尝试在该设置之外定义选项，则会出现以下异常

MacBook-Pro:~ user$ pytest --help | grep " -[a-z]"
  -k EXPRESSION         only run tests which match the given substring
                        -k 'test_method or test_other' matches all test
                        'test_method' or 'test_other', while -k 'not
  -m MARKEXPR           only run tests matching given mark expression.
                        example: -m 'mark1 and not mark2'.
  -x, --exitfirst       exit instantly on first error or failed test.
  -c file               load configuration from `file` instead of trying to
  -s                    shortcut for --capture=no.
  -v, --verbose         increase verbosity.
  -q, --quiet           decrease verbosity.
  -r chars              show extra test summary info as specified by chars
  -l, --showlocals      show locals in tracebacks (disabled by default).
  -h, --help            show help message and configuration info
  -p name               early-load given plugin (multi-allowed). To avoid
  -o [OVERRIDE_INI [OVERRIDE_INI ...]], --override-ini=[OVERRIDE_INI [OVERRIDE_INI ...]]

无论我选择哪个角色，这似乎都是事实，这让我认为这只是行为受限期。

问题：pytest是否限制短选项的所有使用？

我有点困惑，因为当您查看相关的pytest source

def pytest_addoption(parser):
    parser.addoption('-b', '--build_special' )


  File "/Library/Python/2.7/site-packages/_pytest/config/argparsing.py", line 72, in addoption
    self._anonymous.addoption(*opts, **attrs)
  File "/Library/Python/2.7/site-packages/_pytest/config/argparsing.py", line 305, in addoption
    self._addoption_instance(option, shortupper=False)
  File "/Library/Python/2.7/site-packages/_pytest/config/argparsing.py", line 315, in _addoption_instance
    raise ValueError("lowercase shortoptions reserved")
ValueError: lowercase shortoptions reserved

似乎建议我可以使用与argparse的add_option完全相同的语法，有趣的是在argparse documentation中提到了

将所有def addoption(self, *opts, **attrs): """ register a command line option. :opts: option names, can be short or long options. :attrs: same attributes which the ``add_option()`` function of the `argparse library <http://docs.python.org/2/library/argparse.html>`_ accepts. After command line parsing options are available on the pytest config object via ``config.option.NAME`` where ``NAME`` is usually set by passing a ``dest`` attribute, for example ``addoption("--long", dest="NAME", ...)``. """ self._anonymous.addoption(*opts, **attrs)呼叫替换为 optparse.OptionParser.add_option()个呼叫。

和add_argument documentation明确列出了允许的单个标志选项：

ArgumentParser.add_argument()方法必须知道是否有可选参数，   如add_argument()或-f，或位置参数，如列表   文件名。传递给add_argument（）的第一个参数   因此，必须是一系列标志或简单的参数名称。   例如，可以创建一个可选参数，例如：

--foo

Answer 1

从pytest源代码...

/src/_pytest/config/argparsing.py

def _addoption_instance(self, option: "Argument", shortupper: bool = False) -> None:
    if not shortupper:
        for opt in option._short_opts:
            if opt[0] == "-" and opt[1].islower():
                raise ValueError("lowercase shortoptions reserved")
    if self.parser:
        self.parser.processoption(option)
    self.options.append(option)

是的，它们限制所有小写的短选项

pytest是否会限制自定义命令行参数中的所有小写选项？

1 个答案:

/src/_pytest/config/argparsing.py