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Python [OOP] I can't create an object - I got an invalid syntax error.

Kaworu

Active Coder
Hi.

I created a simple script to generate safe passwords. When I tried to rewrite it as OO code, I suddenly have an error.

My code is this:

Python:
import string
import random

class RandomPassword:

    def __init__(self):
        self.lc = string.ascii_lowercase
        self.uc = string.ascii_uppercase
        self.nr = string.digits
        self.special = string.punctuation

    def random_lowercase(self):
        random_lc = random.choice(self.lc)
        return random_lc

    def random_uppercase(self):
        random_uc = random.choice(self.uc)
        return random_uc

    def random_nr(self):
        random_nr = random.choice(self.nr)
        return random_nr

    def random_special(self):
        random_special = random.choice(self.special)
        return random_special

    def generate_safe_password(self, size = 20):
        random_list = list()

        while size != 0:
            random_step = random.randint(1,4)
            if random_step == 1:
                x = random_lowercase()
                random_list.append(x)
            elif random_step == 2:
                x = random_uppercase()
                random_list.append(x)
            elif random_step == 3:
                x = random_nr()
                random_list.append(x)
            elif random_step == 4:
                x = random_special()
                random_list.append(x)
            
            size = size - 1
        
        return random_list

    def string_from_list(self, my_list):
        my_string = "".join(my_list)

        return my_string

    def final_result(self):
        a = RandomPassword.generate_safe_password()
        b = RandomPassword.string_from_list(a)
        
        return b
    
############################
# PROGRAM
############################

if __name__ == "__main__":

    pass = RandomPassword()
    a = pass.final_result()
    print("Your new safe password is: ", a)

The error is in the first line after if __name__ == "__main__". Exactly in the place when there is an equality sign. SyntaxError: invalid syntax

Its kinda hard to say what's wrong. Indexation? Seems alright, Something else?

I would appreciate any help ;-)
 
I tried your code and kept getting lots of errors.
Here is a simple example for you to work with.

Python:
# Do the imports
from random import sample
import string


class Generate:
    '''
        Generate uses letters, digits, and special characters
        to generate a 8 character password
    '''
    def __init__(self, count=8):
        ''' Combine all usable characters '''
        characters = string.ascii_letters + string.digits + '!@#&+*'
      
        # We want at least 8 characters
        if count < 8:
            count = 8
      
        # Let's keep the character count under 12'
        if count > 12:
            count = 12
          
        # Get a sample of  8 characters
        self.password = ''.join(sample(characters, count))
      
    def __str__(self):
        # Return the password as a string
        return self.password
      

print(f'Default 8 characters -> {Generate()}')

print(f'10 Characters -> {Generate(10)}')

Code:
Default 8 characters -> z+*9o7Nd
10 Characters -> Hb#KUQDan2



I corrected your code. Now it works.
Other than the error mentioned above, when calling a function in class you must prepend self.
Example instead of func(), it needs to be self.func()

Python:
import string
import random

class RandomPassword:

    def __init__(self):
        self.lc = string.ascii_lowercase
        self.uc = string.ascii_uppercase
        self.nr = string.digits
        self.special = string.punctuation

    def random_lowercase(self):
        random_lc = random.choice(self.lc)
        return random_lc

    def random_uppercase(self):
        random_uc = random.choice(self.uc)
        return random_uc

    def random_nr(self):
        random_nr = random.choice(self.nr)
        return random_nr

    def random_special(self):
        random_special = random.choice(self.special)
        return random_special

    def generate_safe_password(self, size = 20):
        random_list = list()

        while size != 0:
            random_step = random.randint(1,4)
            if random_step == 1:
                x = self.random_lowercase()
                random_list.append(x)
            elif random_step == 2:
                x = self.random_uppercase()
                random_list.append(x)
            elif random_step == 3:
                x = self.random_nr()
                random_list.append(x)
            elif random_step == 4:
                x = self.random_special()
                random_list.append(x)
            
            size = size - 1
        
        return random_list

    def string_from_list(self, my_list):
        my_string = "".join(my_list)

        return my_string

    def final_result(self):
        a = RandomPassword().generate_safe_password()
        b = RandomPassword().string_from_list(a)
        
        return b
    
############################
# PROGRAM
############################

if __name__ == "__main__":

    mypass = RandomPassword()
    a = mypass.final_result()
    print("Your new safe password is: ", a)
 
Last edited:

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