Mistakenly stripped the leading "C"

Fix #5

pdm/installers.py

@@ -79,7 +79,7 @@ class Installer:
         paths = self.environment.get_paths()
         install_script = importlib.import_module(
             "pdm._editable_install"
-        ).__file__.strip("co")
+        ).__file__.rstrip("co")
         install_args = [
             self.environment.python_executable,
             "-u",

pdm/utils.py

@@ -334,9 +334,7 @@ def get_python_version(executable: str) -> Tuple[Union[str, int], ...]:
 
 
 def get_pep508_environment(executable: str) -> Dict[str, Any]:
-    script = importlib.import_module("pdm.pep508").__file__
-    if script.endswith("pyc"):
-        script = script[:-1]
+    script = importlib.import_module("pdm.pep508").__file__.rstrip("co")
     args = [executable, script]
     return json.loads(subprocess.check_output(args))