# Write a Python program to Convert Integer Matrix to String Matrix # Python3 code to demonstrate working of # Convert Integer Matrix to String Matrix# Using str() + list comprehension  # initializing listtest_list = [[4, 5, 7], [10, 8, 3], [19, 4, 6], [9, 3, 6]]  # printing original listprint("The original list : " + str(test_list))  # using str() to convert each element to string res = [[str(ele) for ele in sub] for sub in test_list]  # printing result print("The data type converted Matrix : " + str(res))