[Python] How should I go about writing the time dilation equation in python?

I'm trying to write/plot the time dilation equation (g = 1/sqrt(1 - (v/c)^2) in python through jupyter notebook but it keeps giving me this error message:

TypeError: pow() missing required argument 'exp' (pos 2)

B describes v/c and is the x-axis and g described 1/sqrt(1 - (v/c)^2 and is the y-axis. I was trying to plot B over g. The variable x is supposed to represent 1 - B**2 or 1- (v/c)**2

from pylab import *
v = linspace(0, 50, 100)
c = 3 * 10**8
B = v/c
x = 1-B**2
g = (1)/(pow(x))
plot(B,g,'b-')
title("graph")
xlabel("Beta")
ylabel("gamma")
show()

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