Suppress output of object when plotting in ipython

You can also add plt.show():

plt.hist(OIR['Range'], bins, named=True, histtype='bar')
plt.show() 

Assign the return value to a variable (which I call _ to indicate it's unused):

_ = plt.hist(...)

just put ; after the code.
It works only in ipython-notebook.

plt.hist(...);