WindowsPath not iterable

[garnaat]

Related to aws/aws-cdk#2181

When the Python runtime tries to start the JSII process it attempts to discover the path to the .js runtime. On Windows, this produces the following error.

>>> import app
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Users\Administrator\fiebaz\app.py", line 3, in <module>
    from aws_cdk import cdk
  File "C:\Users\Administrator\fiebaz\.env\lib\site-packages\aws_cdk\cdk\__init__.py", line 12, in <module>
    import aws_cdk.cx_api
  File "C:\Users\Administrator\fiebaz\.env\lib\site-packages\aws_cdk\cx_api\__init__.py", line 11, in <module>
    __jsii_assembly__ = jsii.JSIIAssembly.load("@aws-cdk/cx-api", "0.28.0", __name__, "[email protected]")
  File "C:\Users\Administrator\fiebaz\.env\lib\site-packages\jsii\_runtime.py", line 40, in load
    _kernel.load(assembly.name, assembly.version, os.fspath(assembly_path))
  File "C:\Users\Administrator\fiebaz\.env\lib\site-packages\jsii\_kernel\__init__.py", line 184, in load
    self.provider.load(LoadRequest(name=name, version=version, tarball=tarball))
  File "C:\Users\Administrator\fiebaz\.env\lib\site-packages\jsii\_kernel\providers\process.py", line 326, in load
    return self._process.send(request, LoadResponse)
  File "C:\Users\Administrator\fiebaz\.env\lib\site-packages\jsii\_utils.py", line 24, in wrapped
    stored.append(fgetter(self))
  File "C:\Users\Administrator\fiebaz\.env\lib\site-packages\jsii\_kernel\providers\process.py", line 321, in _process
    process.start()
  File "C:\Users\Administrator\fiebaz\.env\lib\site-packages\jsii\_kernel\providers\process.py", line 269, in start
    env=environ,
  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\subprocess.py", line 775, in __init__
    restore_signals, start_new_session)
  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\subprocess.py", line 1119, in _execute_child
    args = list2cmdline(args)
  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\subprocess.py", line 530, in list2cmdline
    needquote = (" " in arg) or ("\t" in arg) or not arg
TypeError: argument of type 'WindowsPath' is not iterable