code: def highest_minor(python_versions):
      '''Return highest minor of a list of stable (semantic) versions.
  
      Example:
          >>> python_versions = [
          ...     '2.6.9', '2.7.14', '3.3.7', '3.4.8', '3.5.5', '3.6.4']
          >>> highest_minor(python_versions)
          '3.6'
  
      '''
      highest = python_versions[-1]
      major, minor, patch = highest.split('.', 2)
      return flo('{major}.{minor}'f highest_minor(python_versions):
      '''Return highest minor of a list of stable (semantic) versions.
  
      Example:
          >>> python_versions = [
          ...     '2.6.9', '2.7.14', '3.3.7', '3.4.8', '3.5.5', '3.6.4']
          >>> highest_minor(python_versions)
          '3.6'
  
      '''
      highest = python_versions[-1]
      major, minor, patch = highest.split('.', 2)
      return flo('{major}.{minor}')
docs: Return highest minor of a list of stable (semantic) versions.
  
      Example:
          >>> python_versions = [
          ...     '2.6.9', '2.7.14', '3.3.7', '3.4.8', '3.5.5', '3.6.4']
          >>> highest_minor(python_versions)
          '3.6'