[Python] How can I make a function that takes either one or two arguments?

I've been tasked with making a function that will work like:

>>> CurryPuff(3)
3.60
>>> CurryPuff(3,'Fish')
4.2


I tried this code:

def CurryPuff(x,typePuff):
if (typePuff==''):
return x*1.2
if (typePuff=='Fish'):
return x*1.4


But I get an error that says:

TypeError: CurryPuff() takes exactly 2 arguments (1 given)


What does this error mean?

How can I make it so that both calls will work?

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