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Fitting distribution in histogram using Python

I was surprised that I couldn't found this piece of code somewhere.

What I basically wanted was to fit some theoretical distribution to my graph. If you are lucky, you should see something like this:

Histogram with distributions

from scipy import stats  
import numpy as np  
import matplotlib.pylab as plt

# create some normal random noisy data
ser = 50*np.random.rand() * np.random.normal(10, 10, 100) + 20

# plot normed histogram
plt.hist(ser, normed=True)

# find minimum and maximum of xticks, so we know
# where we should compute theoretical distribution
xt = plt.xticks()[0]  
xmin, xmax = min(xt), max(xt)  
lnspc = np.linspace(xmin, xmax, len(ser))

# lets try the normal distribution first
m, s = # get mean and standard deviation  
pdf_g = stats.norm.pdf(lnspc, m, s) # now get theoretical values in our interval  
plt.plot(lnspc, pdf_g, label="Norm") # plot it

# exactly same as above
ag,bg,cg =  
pdf_gamma = stats.gamma.pdf(lnspc, ag, bg,cg)  
plt.plot(lnspc, pdf_gamma, label="Gamma")

# guess what :) 
ab,bb,cb,db =  
pdf_beta = stats.beta.pdf(lnspc, ab, bb,cb, db)  
plt.plot(lnspc, pdf_beta, label="Beta")