code: def parse_reqs(req_path='./requirements/requirements.txt'):
      
      install_requires = []
      with codecs.open(req_path, 'r') as handle:
          # remove comments and empty lines
          lines = (line.strip() for line in handle
                   if line.strip() and not line.startswith('#'))
  
          for line in lines:
              # check for nested requirements files
              if line.startswith('-r'):
                  # recursively call this function
                  install_requires += parse_reqs(req_path=line[3:])
              else:
                  # add the line as a new requirement
                  install_requires.append(line)
  
      return install_requires
docs: Recursively parse requirements from nested pip files.