Auto call a method upon instantiating a class

Question

I have a this code:

from selenium import webdriver
from bs4 import BeautifulSoup as BS
from types import NoneType 


class Alluris(object):

    def __init__(self, username, password):
        self.username = username
        self.password = password

    def log_in(self):
        driver = 
webdriver.PhantomJS('C:\Users\V\Desktop\PY\web_scrape\phantomjs.exe')
        driver.get('https://alluris.han.nl')
        driver.find_element_by_id('username').send_keys(self.username)
        driver.find_element_by_id('password').send_keys(self.password)
        driver.find_element_by_xpath('//*
[@id="formfields"]/input[3]').click()
        soup = BS(driver.page_source, 'lxml')
        if type(soup.find('div', {'id' : 'errormessage'})) == NoneType:
            return 'Logged in successfully'
        else:
            return soup.find('div', {'id' : 'errormessage'}).text

I want the log_in method to auto run when i create an instance of a class, for example:

  print Alluris('username', 'password')

Output should be :

Logged in successfully

Or

Incorrect username or password

Basically I don't want to run the log_in method manually like

 print Alluris('username', 'password').log_in()

EDIT: I tried putting self.log_in() in the __init__ method but it only return the class object.

You can simply put `self.log_in()` call in your `__init__` method. — taras, Jul 07 '17 at 18:58
If you expect something else to be returned, how would you get the instance of the class? — Klaus D., Jul 07 '17 at 19:06
@KlausD. I'm sorry but i dont quite understand your question. — V.Anh, Jul 07 '17 at 19:08

score 3 · Accepted Answer · answered Jul 07 '17 at 18:58

3

You can do that by calling the method in your __init__ method:

class Alluris(object):

    def __init__(self, username, password):
        self.username = username
        self.password = password
        self.log_in()

answered Jul 07 '17 at 18:58

Moses Koledoye

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2

@V.Anh You should probably `print` not `return` in your `log_in` – Moses Koledoye Jul 07 '17 at 19:01
It worked, thank you a lot but is there any decorator that allow me to perform the same thing ? – V.Anh Jul 07 '17 at 19:03
@V.Anh Why do you need a decorator? – Moses Koledoye Jul 07 '17 at 19:05
I'm just curious that's all. – V.Anh Jul 07 '17 at 19:05
@V.Anh Decorators are not very difficult to code, only it gets tricky when decorating a class method. You can start from [here](https://stackoverflow.com/questions/11731136/python-class-method-decorator-w-self-arguments), if you run into any problems, feel free to ask a new question. – Moses Koledoye Jul 07 '17 at 19:07

Auto call a method upon instantiating a class

1 Answers1