code: def network(
      t,
      url: str = "https://www.google.com",
      raise_on_error: bool = False,
      check_before_test: bool = False,
      error_classes=None,
      skip_errnos=_network_errno_vals,
      _skip_on_messages=_network_error_messages,
  ):
      """
      Label a test as requiring network connection and, if an error is
      encountered, only raise if it does not find a network connection.
  
      In comparison to ``network``, this assumes an added contract to your test:
      you must assert that, under normal conditions, your test will ONLY fail if
      it does not have network connectivity.
  
      You can call this in 3 ways: as a standard decorator, with keyword
      arguments, or with a positional argument that is the url to check.
  
      Parameters
      ----------
      t : callable
          The test requiring network connectivity.
      url : path
          The url to test via ``pandas.io.common.urlopen`` to check
          for connectivity. Defaults to 'https://www.google.com'.
      raise_on_error : bool
          If True, never catches errors.
      check_before_test : bool
          If True, checks connectivity before running the test case.
      error_classes : tuple or Exception
          error classes to ignore. If not in ``error_classes``, raises the error.
          defaults to OSError. Be careful about changing the error classes here.
      skip_errnos : iterable of int
          Any exception that has .errno or .reason.erno set to one
          of these values will be skipped with an appropriate
          message.
      _skip_on_messages: iterable of string
          any exception e for which one of the strings is
          a substring of str(e) will be skipped with an appropriate
          message. Intended to suppress errors where an errno isn't available.
  
      Notes
      -----
      * ``raise_on_error`` supersedes ``check_before_test``
  
      Returns
      -------
      t : callable
          The decorated test ``t``, with checks for connectivity errors.
  
      Example
      -------
  
      Tests decorated with @network will fail if it's possible to make a network
      connection to another URL (defaults to google.com)::
  
        >>> from pandas import _testing as tm
        >>> @tm.network
        ... def test_network():
        ...     with pd.io.common.urlopen("rabbit://bonanza.com"):
        ...         pass
        >>> test_network()  # doctest: +SKIP
        Traceback
           ...
        URLError: <urlopen error unknown url type: rabbit>
  
        You can specify alternative URLs::
  
          >>> @tm.network("https://www.yahoo.com")
          ... def test_something_with_yahoo():
          ...    raise OSError("Failure Message")
          >>> test_something_with_yahoo()  # doctest: +SKIP
          Traceback (most recent call last):
              ...
          OSError: Failure Message
  
      If you set check_before_test, it will check the url first and not run the
      test on failure::
  
          >>> @tm.network("failing://url.blaher", check_before_test=True)
          ... def test_something():
          ...     print("I ran!")
          ...     raise ValueError("Failure")
          >>> test_something()  # doctest: +SKIP
          Traceback (most recent call last):
              ...
  
      Errors not related to networking will always be raised.
      """
      import pytest
  
      if error_classes is None:
          error_classes = _get_default_network_errors()
  
      t.network = True
  
      @wraps(t)
      def wrapper(*args, **kwargs):
          if (
              check_before_test
              and not raise_on_error
              and not can_connect(url, error_classes)
          ):
              pytest.skip(
                  f"May not have network connectivity because cannot connect to {url}"
              )
          try:
              return t(*args, **kwargs)
          except Exception as err:
              errno = getattr(err, "errno", None)
              if not errno and hasattr(errno, "reason"):
                  # error: "Exception" has no attribute "reason"
                  errno = getattr(err.reason, "errno", None)  # type: ignore[attr-defined]
  
              if errno in skip_errnos:
                  pytest.skip(
                      f"Skipping test due to known errno and error {err}"
                  )
  
              e_str = str(err)
  
              if any(
                  m.lower() in e_str.lower() for m in _skip_on_messages
              ):
                  pytest.skip(
                      f"Skipping test because exception message is known and error {err}"
                  )
  
              if not isinstance(err, error_classes) or raise_on_error:
                  raise
              pytest.skip(
                  f"Skipping test due to lack of connectivity and error {err}"
              )
  
      return wrapper
  
imports: from __future__ import annotations
  import bz2
  from functools import wraps
  import gzip
  import io
  import socket
  import tarfile
  from typing import TYPE_CHECKING, Any, Callable
  import zipfile
  from pandas._typing import FilePath, ReadPickleBuffer
  from pandas.compat import get_lzma_file
  from pandas.compat._optional import import_optional_dependency
  import pandas
  from pandas._testing._random import rands
  from pandas._testing.contexts import ensure_clean
  from pandas.io.common import urlopen
label_desc: Use image node_id 3 for calling a global function with example usage: network(t, url, raise_on_error, check_before_test, error_classes, skip_errnos, _skip_on_messages) and returns: wrapper, t