[issue38000] importlib can not handle module file names with periods

[Andrey]

New submission from Andrey <andry at inbox.ru>:

```
import os, sys

def import_module(dir_path, module_name, ref_module_name = None):
  module_file_path = os.path.join(dir_path, module_name).replace('\\', '/')
  if sys.version_info[0] > 3 or sys.version_info[0] == 3 and sys.version_info[1] >= 4:
    import importlib
    import_spec = importlib.util.spec_from_file_location(os.path.splitext(module_name)[0] if ref_module_name is None else ref_module_name, os.path.join(dir_path, module_name).replace('\\', '/'))
    import_module = importlib.util.module_from_spec(import_spec)
    import_spec.loader.exec_module(import_module)
    #globals()[module_name if ref_module_name is None else ref_module_name] = import_module # still does not accept modules with periods without this
  else:
    # back compatability
    import imp
    module_file, module_file_name, module_desc = imp.find_module(os.path.splitext(module_name)[0], [os.path.dirname(module_file_path)])
    globals()[module_name if ref_module_name is None else ref_module_name] = imp.load_module(module_file_path, module_file, module_file_name, module_desc)
```

I am trying to import my modules targeted by file path:

```
import_module(MYTOOLS_ROOT, 'cmdoplib.std.py', 'cmdoplib')
import_module(MYTOOLS_ROOT, 'cmdoplib.yaml.py', 'cmdoplib_yaml')
```

And got error:

```
Traceback (most recent call last):
  File "c:\python\x64\37\lib\site-packages\xonsh\proc.py", line 1411, in run
    r = self.f(self.args, sp_stdin, sp_stdout, sp_stderr, spec, spec.stack)
  File "c:\python\x64\37\lib\site-packages\xonsh\proc.py", line 1204, in proxy_two
    return f(args, stdin)
  File "c:\python\x64\37\lib\site-packages\xonsh\aliases.py", line 575, in source_alias
    builtins.execx(src, "exec", ctx, filename=fpath)
  File "c:\python\x64\37\lib\site-packages\xonsh\built_ins.py", line 1497, in __call__
    return self.obj.__call__(*args, **kwargs)
  File "c:\python\x64\37\lib\site-packages\xonsh\execer.py", line 190, in exec
    return exec(code, glbs, locs)
  File "w:/Work/MyProjects/__scm_solutions/all-in-one/_common/tools/cmdoplib.yaml.xsh", line 11, in <module>
    g_yaml_env = cmdoplib_yaml.YamlEnv()
NameError: name 'cmdoplib_yaml' is not defined
```

If try to uncomment this:

```
globals()[module_name if ref_module_name is None else ref_module_name] = import_module
```

All works fine.
Seems the latest version of the python still can not handle modules with the periods in a file name without constructions from the old and well known `imp` module.

It seems for me as a bug or at least as an incomplete (re)implementation.

----------
components: Interpreter Core
messages: 350950
nosy: andry
priority: normal
severity: normal
status: open
title: importlib can not handle module file names with periods
type: enhancement
versions: Python 3.7

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38000>
_______________________________________