code: def find_binary(self, binary):
          
          if os.path.exists(binary):
              return binary
  
          # Extract out the filename if we were given a full path
          binary_name = os.path.basename(binary)
  
          # Gather $PATH
          search_paths = os.environ['PATH'].split(':')
  
          # Extra paths to scan...
          default_paths = [
              '/usr/bin',
              '/bin'
              '/usr/local/bin',
              '/usr/sbin',
              '/sbin'
              '/usr/local/sbin',
          ]
  
          for path in default_paths:
              if path not in search_paths:
                  search_paths.append(path)
  
          for path in search_paths:
              if os.path.isdir(path):
                  filename = os.path.join(path, binary_name)
                  if os.path.exists(filename):
                      return filename
  
          return binary
docs: Scan and return the first path to a binary that we can find