Remove old workarounds from `subprocess_Popen`

pytensor/utils.py

@@ -137,13 +137,6 @@ def subprocess_Popen(command: str | list[str], **params):
         except AttributeError:
             startupinfo.dwFlags |= subprocess._subprocess.STARTF_USESHOWWINDOW  # type: ignore[attr-defined]
 
-        # Anaconda for Windows does not always provide .exe files
-        # in the PATH, they also have .bat files that call the corresponding
-        # executable. For instance, "g++.bat" is in the PATH, not "g++.exe"
-        # Unless "shell=True", "g++.bat" is not executed when trying to
-        # execute "g++" without extensions.
-        # (Executing "g++.bat" explicitly would also work.)
-        params["shell"] = True
         # "If shell is True, it is recommended to pass args as a string rather than as a sequence." (cite taken from https://docs.python.org/2/library/subprocess.html#frequently-used-arguments)
         # In case when command arguments have spaces, passing a command as a list will result in incorrect arguments break down, and consequently
         # in "The filename, directory name, or volume label syntax is incorrect" error message.
@@ -151,20 +144,7 @@ def subprocess_Popen(command: str | list[str], **params):
         if isinstance(command, list):
             command = " ".join(command)
 
-    # Using the dummy file descriptors below is a workaround for a
-    # crash experienced in an unusual Python 2.4.4 Windows environment
-    # with the default None values.
-    stdin = None
-    if "stdin" not in params:
-        stdin = Path(os.devnull).open()
-        params["stdin"] = stdin.fileno()
-
-    try:
-        proc = subprocess.Popen(command, startupinfo=startupinfo, **params)
-    finally:
-        if stdin is not None:
-            stdin.close()
-    return proc
+    return subprocess.Popen(command, startupinfo=startupinfo, **params)
 
 
 def call_subprocess_Popen(command, **params):

tests/compile/function/test_function.py

 import pickle
-import re
 import shutil
 import tempfile
 from pathlib import Path