Fix get_code on ModuleDirImport (#226)

* Fix get_code on ModuleDirImport

* version

Author: peterebden

tools/ChangeLog

@@ -1,3 +1,7 @@
+Version 1.5.5
+-------------
+    * Fix get_code on ModuleDirImport (#226)
+
 Version 1.5.4
 -------------
     * Handle packages with hyphenated names when loading distribution metadata (#224)

tools/VERSION

@@ -1 +1 @@
-1.5.4
+1.5.5

tools/please_pex/pex/pex_main.py

@@ -191,7 +191,7 @@ def find_spec(self, name, path, target=None):
 
     def create_module(self, spec):
         """Actually load a module that we said we'd handle in find_module."""
-        module = import_module(spec.name[len(self.prefix):])
+        module = import_module(spec.name.removeprefix(self.prefix))
         sys.modules[spec.name] = module
         return module
 
@@ -210,7 +210,7 @@ def find_distributions(self, context):
             return itertools.chain(*self._distributions.values())
 
     def get_code(self, fullname):
-        module = self.load_module(fullname)
+        module = import_module(fullname.removeprefix(self.prefix))
         return module.__loader__.get_code(fullname)