Random Password Generator in Python

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                import random
                import math
                
                alpha = "abcdefghijklmnopqrstuvwxyz"
                num = "0123456789"
                special = "@#$%&*"
                
                # pass_len=random.randint(8,13)  #without User INput
                pass_len = int(input("Enter Password Length"))
                
                # length of password by 50-30-20 formula
                alpha_len = pass_len//2
                num_len = math.ceil(pass_len*30/100)
                special_len = pass_len-(alpha_len+num_len)
                
                
                password = []
                
                
                def generate_pass(length, array, is_alpha=False):
                    for i in range(length):
                        index = random.randint(0, len(array) - 1)
                        character = array[index]
                        if is_alpha:
                            case = random.randint(0, 1)
                            if case == 1:
                                character = character.upper()
                        password.append(character)
                
                
                # alpha password
                generate_pass(alpha_len, alpha, True)

                # numeric password
                generate_pass(num_len, num)

                # special Character password
                generate_pass(special_len, special)

                # suffle the generated password list
                random.shuffle(password)
                
                # convert List To string
                gen_password = ""
                for i in password:
                    gen_password = gen_password + str(i)
                print(gen_password)