Meaning of "misuse of the word 'only'" in context?

Question

I am reading the book *Learning Python* by Mark Lutz, in which there's a passage I don't understand: > I also want to thank my original editor at O’Reilly, the late Frank Willison. This book was largely Frank’s idea. He had a profound impact on both my career and the success of Python when it was new, **a legacy that I remember each time I’m tempted to misuse the word “only.”**Emphasis added. What does he mean?

Answer 1

So, I can only guess as to what it means, but based on my own experiences, I'd guess he's referring to how we shouldn't expect some case to be certain. For example, we'll often say in mathematics if and only if or say the only thing that can be true in a certain case is x. So basically, it's that he remembers to be careful about using strong modifiers like always/only since they're not always correct. (He's reminded to keep an open mind)