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我正在尝试在我的树莓派上运行 PyVirtualDisplay 来打开一个网页。但是,当我运行它时,会引发错误。

错误如下:

Traceback (most recent call last):
  File "test.py", line 4, in <module>
    from pyvirtualdisplay import Display
  File "/usr/local/lib/python2.7/dist-packages/pyvirtualdisplay/__init__.py", line 4, in <module>
    from pyvirtualdisplay.display import Display
  File "/usr/local/lib/python2.7/dist-packages/pyvirtualdisplay/display.py", line 26
    backend: Optional[str] = None,
           ^
SyntaxError: invalid syntax

我正在运行的代码如下:

from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.common.keys import Keys
from pyvirtualdisplay import Display

display = Display(visible=0, size=(1600, 1200))
display.start()

driver = webdriver.Chrome()

driver.get('https://colab.research.google.com/drive/1pqGSjrP3SujtxNwoB_AgVqM0c5DI8R4q')

driver.ActionChains(driver).key_down(Keys.CONTROL).send_keys(Keys.ENTER).perform()

我在我的树莓派 3 B+ 上运行它,它的最新固件。我已经使用 pip 安装了 pyvirtualdisplay,并且还安装了 xvfb。

我不确定为什么会发生错误,但这似乎是由于“display.py”文件中的错误。

“display.py”文件的相关部分如下(有错误的行在第3行):

  def __init__(
        self,
        backend: Optional[str] = None,
        visible: bool = False,
        size: Tuple[int, int] = (1024, 768),
        color_depth: int = 24,
        bgcolor: str = "black",
        use_xauth: bool = False,
        # check_startup=False,
        retries: int = 10,
        extra_args: List[str] = [],
        manage_global_env: bool = True,
        **kwargs
    ):
        self._color_depth = color_depth
        self._size = size
        self._bgcolor = bgcolor
        self._visible = visible
        self._backend = backend

        if not self._backend:
            if self._visible:
                self._backend = "xephyr"
            else:
                self._backend = "xvfb"

        cls = _class_map.get(self._backend)
        if not cls:
            raise ValueError("unknown backend: %s" % self._backend)

        self._obj = cls(
            size=size,
            color_depth=color_depth,
            bgcolor=bgcolor,
            retries=retries,
            use_xauth=use_xauth,
            # check_startup=check_startup,
            extra_args=extra_args,
            manage_global_env=manage_global_env,
            **kwargs
         )

我不知道该怎么做,任何帮助将不胜感激。谢谢你!

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