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The difference between f(x=3) and f(3) of callable symbolic expression 'f'

f=x.diretive()

f(3) ----> error

f(x=3) ----> ok!

Dose f(x=3) call the method __call__?

The difference between f(x=3) and f(3) of callable symbolic expression 'f'

f=x.diretive()f=x.derivative()

f(3) ----> error

f(x=3) ----> ok!

Dose f(x=3) call the method __call__?

The difference between f(x=3) and f(3) of callable symbolic expression 'f'

f=x.derivative()

f(3) ----> error

f(x=3) ----> ok!

Dose f(x=3) call the method __call__?