pass — Advanced Examples

A no-op placeholder; does nothing, used where syntax requires a statement

EasyIntermediateAdvancedExpert

Pass in metaclasses and decorators

Using pass in class construction patterns.

python
# Empty class as a namespace
class Config:
    pass

Config.debug = True
Config.version = "1.0"
Config.max_retries = 3

print(vars(Config))

# Pass in conditional class body
def make_class(with_method):
    class Result:
        if with_method:
            def greet(self):
                return "Hello!"
        else:
            pass
    return Result

WithGreet = make_class(True)
WithoutGreet = make_class(False)
print(WithGreet().greet())
print(hasattr(WithoutGreet(), "greet"))

pass is occasionally needed in dynamic class construction where conditional blocks in the class body might be empty.

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