Fix pre-gen-hooks. (#10)

Author: tobiasraabe

hooks/pre_gen_project.py

@@ -21,7 +21,7 @@
 """
 
 EXCEPTION_MSG_PYTHONVERSION = """
-ERROR: The python version must be >= {PYTHONVERSION_MIN}, got {pythonversion}.
+ERROR: The python version must be >= {min_python_version}, got {python_version}.
 """
 
 
@@ -30,18 +30,22 @@ def main() -> None:
     module_name = "{{ cookiecutter.project_slug}}"
 
     if not re.match(MODULE_REGEX, module_name):
-        raise ValueError(EXCEPTION_MSG_MODULE_NAME.format(module_name))
+        raise ValueError(EXCEPTION_MSG_MODULE_NAME.format(module_name=module_name))
 
     environment_name = "{{ cookiecutter.conda_environment_name }}"
 
     if not re.match(ENVIRON_REGEX, environment_name):
-        raise ValueError(EXCEPTION_MSG_ENVIRON_NAME.format(environment_name))
+        raise ValueError(
+            EXCEPTION_MSG_ENVIRON_NAME.format(environment_name=environment_name)
+        )
 
     python_version = "{{ cookiecutter.python_version }}"
 
     if not re.match(PYTHONVERSION_REGEX, python_version):
         raise ValueError(
-            EXCEPTION_MSG_PYTHONVERSION.format(PYTHONVERSION_MIN, python_version)
+            EXCEPTION_MSG_PYTHONVERSION.format(
+                min_python_version=PYTHONVERSION_MIN, python_version=python_version
+            )
         )