# Write a Python program to Convert Character Matrix to single String # Python3 code to demonstrate working of # Convert Character Matrix to single String# Using join() + list comprehension  # initializing listtest_list = [['g', 'f', 'g'], ['i', 's'], ['b', 'e', 's', 't']]  # printing original listprint("The original list is : " + str(test_list))  # Convert Character Matrix to single String# Using join() + list comprehensionres = ''.join(ele for sub in test_list for ele in sub)  # printing result print("The String after join : " + res) 