class_docstr: Wait strategy that waits a fixed amount of time between each retry.
code: def __call__(self, retry_state):
      return self.wait_fixed
  
imports: import abc
  import random
  import six
  from tenacity import _utils
label_desc: Use image node_id 2 for calling the wait_fixed obj's underlying member method code with example usage: obj.__call__(retry_state) and returns: self