from scipy import*  
import matplotlib.pyplot as plt  
from pylab import*  
s=random.normal(80000,4000,1000)  
count, bins, ignored = plt.hist(s, 30, normed=True)

Traceback (most recent call last):
   File "<pyshell#183>", line 1, in <module>
     count, bins, ignored = plt.hist(s, 30, normed=True)
   File "C:\Python25\Lib\site-packages\matplotlib\pyplot.py", line 1633, in hist
     ret =  gca().hist(*args, **kwargs)
   File "C:\Python25\Lib\site-packages\matplotlib\axes.py", line 5124, in hist
     align=align, log=log)
   File "C:\Python25\Lib\site-packages\matplotlib\axes.py", line 3288, in bar
     assert len(height)==nbars, "argument 'height' must be %d or scalar" % nbars
 AssertionError: argument 'height' must be 31 or scalar