Create importer.py

Author: TarrySingh

python-tuts/0-beginner/8-Modules_Packages_Namespaces/Eg.3/B/importer.py

@@ -0,0 +1,37 @@
+# importer.py
+print('Running importer.py')
+
+import os.path
+import types
+import sys
+
+
+def import_(module_name, module_file, module_path):
+ if module_name in sys.modules:
+ return sys.modules[module_name]
+
+ module_rel_file_path = os.path.join(module_path, module_file)
+ module_abs_file_path = os.path.abspath(module_rel_file_path)
+
+ # read source code from file
+ with open(module_rel_file_path, 'r') as code_file:
+ source_code = code_file.read()
+
+ # next we create a module object
+ mod = types.ModuleType(module_name)
+ mod.__file__ = module_abs_file_path
+
+ # insert a reference to the module in sys.modules
+ sys.modules[module_name] = mod
+
+ # compile the module source code into a code object
+ # optionally we should tell the code object where the source came from
+ # the third parameter is used to indicate that our source consists of a sequence of statements
+ code = compile(source_code, filename=module_abs_file_path, mode='exec')
+
+ # execute the module
+ # we want the global variables to be stored in mod.__dict__
+ exec(code, mod.__dict__)
+
+ # return the module
+ return sys.modules[module_name]