Added graceful handling of creating a venv with pip

BolunThompson · BolunThompson · commit 22dc98091b60 · 2020-07-31T19:32:01.000-07:00
Currently, RustPython doesn't support the pip module. Normally, when
creating a virtual environment, pip is automatically installed. This
adds an specific error message when pip is attempted to be installed.
diff --git a/Lib/venv/__init__.py b/Lib/venv/__init__.py
@@ -290,6 +290,10 @@ def setup_python(self, context):
 
     def _setup_pip(self, context):
         """Installs or upgrades pip in a virtual environment"""
+        # TODO: RustPython
+        msg = ("Pip isn't supported yet. To create a virtual environment"
+               "without pip, call venv with the --without-pip flag.")
+        raise NotImplementedError(msg)
         # We run ensurepip in isolated mode to avoid side effects from
         # environment vars, the current directory and anything else
         # intended for the global Python environment
