sampleA = pd.concat([ordersByUsersA['orders'],pd.Series(0, index=np.arange(data['visitorsPerDateA'].sum() - len(ordersByUsersA['orders'])), name='orders')],axis=0)

sampleB = pd.concat([ordersByUsersB['orders'],pd.Series(0, index=np.arange(data['visitorsPerDateB'].sum() - len(ordersByUsersB['orders'])), name='orders')],axis=0)
print("{0:.3f}".format(stats.mannwhitneyu(sampleA, sampleB)[1]))


---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
<ipython-input-96-c36efdaf785e> in <module>
      2
      3 sampleB = pd.concat([ordersByUsersB['orders'],pd.Series(0, index=np.arange(data['visitorsPerDateB'].sum() - len(ordersByUsersB['orders'])), name='orders')],axis=0)
----> 4 print("{0:.3f}".format(stats.mannwhitneyu(sampleA, sampleB)[1]))

NameError: name 'stats' is not defined