class_docstr: Raised when an invalid trading pair is trying to be created.
  
  Parameters
  ----------
  base : 'Instrument'
      The base instrument of the pair.
  quote : 'Instrument'
      The quote instrument of the pair.
  *args : positional arguments
      More positional arguments for the exception.
code: def __init__(
      self, base: "Instrument", quote: "Instrument", *args
  ) -> None:
      super().__init__(
          "Invalid instrument pair {}/{}.".format(base, quote), *args
      )
  
imports: from typing import Union
  from numbers import Number
label_desc: Use image node_id 1 to create a new InvalidTradingPair object from inherited base classes: Exception with example: obj = InvalidTradingPair(base, quote)