ModuleNotFoundError

---

---

ModuleNotFoundError is raised when Python cannot find a module from an import statement. A Python module has a filename that ends in .py

test_module_not_found_error

red: make it fail

• I open a terminal to run makePythonTdd.sh with module_not_found_error as the name of the project

  ./makePythonTdd.sh module_not_found_error
  

  on Windows without Windows Subsystem Linux use makePythonTdd.ps1

  ./makePythonTdd.ps1 module_not_found_error
  

  it makes the folders and files that are needed, installs packages, runs the first test, and the terminal shows AssertionError

  E       AssertionError: True is not false
  
  tests/test_module_not_found_error.py:7: AssertionError
  

• I hold ctrl (windows/linux) or option (mac) on the keyboard and use the mouse to click on tests/test_module_not_found_error.py:7 to open it in the editor, then change test_failure to test_module_not_found_error

  import unittest
  
  
  class TestModuleNotFoundError(unittest.TestCase):
  
      def test_module_not_found_error(self):
          import src.module_00
  

  and the terminal shows ModuleNotFoundError

  ModuleNotFoundError: No module called 'src.module_00'
  

  because Python cannot find module_00.py in the src folder

• I add the error to the list of Exceptions encountered

  # Exceptions Encountered
  # AssertionError
  # ModuleNotFoundError
  

green: make it pass

• then I rename module_not_found_error.py in the src folder to module_00.py and the terminal shows a passing test

• I add another import statement

  def test_module_not_found_error(self):
      import src.module_00
      import src.module_01
  

  which gives me ModuleNotFoundError

  ModuleNotFoundError: No module named 'src.module_01'
  

• When I make a new file named module_01.py in the src folder, the terminal shows a passing test

• I continue with another import statement

  def test_module_not_found_error(self):
      import src.module_00
      import src.module_01
      import src.module_02
  

  and get ModuleNotFoundError

  ModuleNotFoundError: No module called 'src.module_02'
  

• I add module_02.py to the src folder, and the terminal shows green again

• one last failing import statement

  def test_module_not_found_error(self):
      import src.module_00
      import src.module_01
      import src.module_02
      import src.module_03
  

  and the terminal shows

  ModuleNotFoundError: No module called 'src.module_03'
  

• I add the file to the src folder and the test passes

---

review

I ran a test for the ModuleNotFoundError and Python modules. Would you like to test the AssertionError?

---

ModuleNotFoundError: test