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There are two issues here. First, n cannot have a continuous range as the function defined only for integer n. Second, plugging in a particular value of n needs be done via functools.partial. Here is a working example:

import functools

def w(x,n):
    if n==1:
        return x^x
    else: 
        return x^(w(x,n-1))

plot([functools.partial(w,n=n0) for n0 in (1..10)], (x, 0.01, 0.99))