import numpy as np
x=[[1,2,3,4],[6,7,8,9],[4,5,6,7]]
x
ar=np.array(x)
ar
ar[:,(1,2)]
ar[:,(0,1)]
ar[:,0:2]
ar[:,0:3]
ar+1
ar*7
np.mean(ar)
np.std(ar)
teamleads=np.array(['Adam', 'Mark','Antony', 'Deb', 'adam', 'Adam', 'Deb'])
np.unique(teamleads)