Write a Python program to remove unwanted characters from a given string

def remove_chars(str1, unwanted_chars):
    for i in unwanted_chars:
        str1 = str1.replace(i, '')
    return str1



str1 = "Pyth*^on Exercis^es"
str2 = "A%^!B#*CD"

unwanted_chars = ["#", "*", "!", "^", "%"]
print ("Original String : " + str1)
print("After removing unwanted characters:")
print(remove_chars(str1, unwanted_chars))
print ("\nOriginal String : " + str2)
print("After removing unwanted characters:")
print(remove_chars(str2, unwanted_chars))