Why append function used in the first "for loop"?

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import random
letters = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z']
numbers = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9']
symbols = ['!', '#', '$', '%', '&', '(', ')', '*', '+']

print("Welcome to the PyPassword Generator!")
nr_letters = int(input("How many letters would you like in your password?\n")) 
nr_symbols = int(input(f"How many symbols would you like?\n"))
nr_numbers = int(input(f"How many numbers would you like?\n"))

password_list = []
for char in range(0 , nr_letters + 1):
    password_list.append(random.choice(letters))
#print(password_list)
    
for char in range(0 , nr_numbers + 1):
    password_list += random.choice(numbers)
    
for char in range(0 , nr_symbols + 1):
    password_list += random.choice(symbols)
    
print(password_list)
random.shuffle(password_list)
print(password_list)

password = ""
for char in password_list:
    password += char
    
print(password)

What I have tried:

What's the purpose of the append function, I removed it and the program is working without any error but what's the purpose of this function to use here?
Thank you!

Posted 20-Sep-22 4:52am

Mohammad Muneer

Updated 27-Sep-22 4:34am

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Member 8428760 10-Oct-22 16:51pm

The append function is like push in other languages for an array. += used more for math and concatenation. So I think it is mostly convention.

2 solutions

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Richard MacCutchan · Answer 1 · 2022-09-20T05:49:00

Python

password_list = []
for char in range(0 , nr_letters + 1): # generates 1 item too many
    password_list.append(random.choice(letters))

That code adds each letter to the end of the password_list array. And if you remove those lines then your code will not work correctly.

Also your range loops are wrong, they should be in the form:

Python

# if nr_letters = 5
for char in range(nr_letters): // counts from 0 to 5 - 1, this will generate 5 items.

Zak River · Answer 2 · 2022-09-27T04:34:00

Solution 2

You can also use the form

numbers = list('0123456789')

It's a lot less typing and less prone to typos.

Posted 27-Sep-22 4:34am

Zak River