What does it mean?

Question

Python code often contains references to the comedy group Monty Python. This is why the words, "spam" and "eggs" are often used as placeholder variables in Python where "foo" and "bar" would be used in other programming languages.

Answer 1

https://stackoverflow.com/questions/4868904/what-is-the-origin-of-foo-and-bar

https://softwareengineering.stackexchange.com/questions/69788/what-is-the-history-of-the-use-of-foo-and-bar-in-source-code-examples