array : [array_like]Input array or object whose elements, we need to test. out : [ndarray, optional]Output array with same dimensions as Input array, placed with result. **kwargs : Allows you to pass keyword variable length of argument to a function. It is used when we want to handle named argument in a function. where : [array_like, optional]True value means to calculate the universal functions(ufunc) at that position, False value means to leave the value in the output alone.

An array with 2**x(power of 2) for all x i.e. array elements 

# Python program explaining
# exp2() function
import numpy as np

in_array = [1, 3, 5, 4]
print ("Input array : \n", in_array)

exp2_values = np.exp2(in_array)
print ("\n2**x values : \n", exp2_values)

Input array : 
 [1, 3, 5, 4]

2**x values : 
 [  2.   8.  32.  16.]

# Python program showing
# Graphical representation of 
# exp2() function
import numpy as np
import matplotlib.pyplot as plt

in_array = [1, 2, 3, 4, 5 ,6]
out_array = np.exp2(in_array)

print("out_array : ", out_array)

y = [1, 2, 3, 4, 5 ,6]
plt.plot(in_array, y, color = 'blue', marker = "*")

# red for numpy.exp2()
plt.plot(out_array, y, color = 'red', marker = "o")
plt.title("numpy.exp2()")
plt.xlabel("X")
plt.ylabel("Y")
plt.show()