reading-notes

Class 04 Topic

Classes and Objects

• Objects - encapsulation of variables and functions to make a single thing. Get variables and functions from classes. Classes are a template to create objects.

Thinking Recursively

• Iteration - counting from start to finish
• Recursion - Splits the work in half(functions calls itself)

• stack frame - each recursion call adds one to the call stack until it reaches the base case.

• Maintaining State - must do one of these
  • Thread through each recursive call
  • keep state in global scope
• Recursive Data Structure - defines in terms of smaller version of self

Pytest Fixtures and Coverage

• Fixtures - objects available to all tests
  • pytest.fixture

  def reverse_lines(f):
    return [one_line.rstrip()[::-1]+ '\n'
      for one_line in f]
  

  @pytest.fixture(scope='module')
  def simple_file():
   return StringIO('\n'.join(['abc', 'def', 'ghi', 'jkl']))
  

  • Coverage - pytest-cov on PyPI to download, invoke --cov

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