OK .. what you want is :

from mpmath import *
plot(lambda q: qgamma(mpf(0.5),mpf(q)), (0, .99))
print sqrt(pi)

Bonus (my notation Fq is gammaq function and F is gamma function) : 
from  https://en.wikipedia.org/wiki/Q-gamma_function :  lim Fq(x) q->1 = 
F(x)
from  https://en.wikipedia.org/wiki/Gamma_function : F(1/2) = sqrt(pi)

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