python3 string format

[Shiyao Ma]

HI.
one thing confuses me.
It is said in the pep3101 that "{}".format (x) will invoke the method
x.__format__
However, I looked at the src of python3 and found:
in class str(object), the format simply contains a pass statement
in class int(object), things is the same.

So, what's the mechanism that "{}" works?
Thx

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