import numpy as np
a=np.array([1,2,3,4])
print(a/2)
b=np.array([1,'a'])
print(b)
c=[1,2,3,4]
print(c)
d=[1,'a',4]
print(d)
#e=np.array([1,2+i,3], "complex")
e= np.arange(20,dtype='complex')
print(e)
f=np.ones((3,3))
print(f)
np.random.ranf()