Python appending list

Question

Trying to change a list so i can generate a password

passwordlength=int(input('Enter how long you would like the password')) # The user input 

for x in range(0,passwordlength):         
       password=''.join(characters)                
       print(password)

That is what i am working with now. Characters is what i am using for my list. This is giving me for the input the list repeated for the input number.

Every time i try and use a append to the list i just end up going backwards

Any help would be appreciated

Answer 1

I think random.sample may be what you want:

from random import sample

passwordlength = int(input('Enter how long you would like the password')) # The user input 


password = ''.join(sample(characters,passwordlength))

Or else take a slice up to passwordlength:

password = ''.join(characters[:passwordlength]) 

To validate the user input we can use a try/except and a while loop:

from random import sample

while True:
    try:
        password_length = int(input('Enter password length between 1-{}'.format(len(characters)))) # The user input
        if password_length > len(characters):
            print("Password is too long")
            continue
        password = ' '.join(sample(characters,password_length))
        break
    except ValueError:
         print("Please enter digits only")

If you have ints in your character list you will need to map to str before joining.

password = ' '.join(map(str,sample(characters,password_length)))

Answer 2

Try it like this:

passwordlength=int(input('Enter how long you would like the password')) # The user input 
characters=['1','2','3','4','5','a','b','b']
password=[]
for x in range(0,passwordlength):         
       password.append(characters[x])                

print(''.join(password))

Answer 3

I'm sorry, but this question isn't completely clear.

Here are the assumptions that I am making here:

• passwordlength is an integer containing the length to truncate to (which is in the code)
• characters is a list of characters / numbers that you want to use for the password. e.g. characters = ['1', '2' ,'a' , 'c', 'd'] etc.

I don't understand what you are trying to do with the for loop?

I believe the following should do what you want.

password = ''.join(characters)[0:passwordlength]

Answer 4

Here is some is a mock set up. Where choice will randomly choice an item from a list

from random import choice

myaplha = #somelist of letters to choice from
password = int(input("Enter password length")):

passw = []
for i in range(password):
    passw.append(choice(myaplha))
print("".join(passw))

or

password = "".join([choice(myaplha) for i in range(int(input("Enter password length")))])
print(password)