Generate random value once for every issue Python

Question

I'm trying to generate random title for an auction and then use it outside the method.

add_consignment.py:

class AddConsignmentPage(BasePage):

    def __init__(self, driver):
        super(AddConsignmentPage, self).__init__(driver, self._title)
        self._title_uuid = get_random_uuid(7)

inst = AddConsignmentPage(AddConsignmentPage)

and I want to use the same _title_uuid to view added consignment (type its title into search field)

view_consignments.py

from pages.add_consignment import inst
class ViewConsignmentsPage(BasePage):
    _title_uuid = inst._title_uuid

    def check_added_consignment(self):
        self.send_keys(self._title_uuid, self._auction_search)

In this scenario the title is generated two times so title in added consignment is different than title in search field

So how to pass the value of _title_uuid from AddConsignmentPage to ViewConsignmentsPage? I want it to be the same in two methods, but different for every consignment(test case)

How to get it generated once for every consignment?

possible duplicate of [Static class variables in Python](http://stackoverflow.com/questions/68645/static-class-variables-in-python) — csl, Apr 16 '15 at 05:43

score 1 · Answer 1 · edited May 23 '17 at 12:28

That's because _title_uuid is a class variable and not an instance variable: It's only initialized once. But if you initialize it in the constructor, it should work.

See also Static class variables in Python

E.g.,

import random

class Foo:
    num1 = random.randint(1,10)

    def __init__(self):
        self.num2 = random.randint(1,10)

for n in range(10):
    foo = Foo()
    print(foo.num1, foo.num2)

Running the above gives:

(7, 2)
(7, 6)
(7, 6)
(7, 5)
(7, 7)
(7, 1)
(7, 2)
(7, 3)
(7, 7)
(7, 7)

You can also do print(Foo.num1) here, if that clarifies anything, but not print(Foo.num2) because that only exists for instantiated objects.

As you can see, num1 is initialized once, while num2 is initialized for every instantiation of the object.

In you case, you can probably just do:

class AddConsignmentPage(BasePage):
    def __init__(self):
        super(AddConsignmentPage, self).__init__() # initializes BasePage
        self._title_uuid = get_random_uuid(7)

    # ...

score 0 · Answer 2 · answered Apr 15 '15 at 14:33

I think you should define the _title_uuid inside an __init__ method since the value on the class will be changed each time.

In your case it could be:

def __init__(self, *args, **kw):
   super(AddConsignmentPage, self).__init__(*args, **kw)
   self._title_uuid = get_random_uuid(7)

jedrek cienicki · Accepted Answer · 2015-04-21T11:07:56.640

I've fixed the problem by adding ViewConsignmentsPage._title_uuid = self._title_uuid to init method

add_consignment.py:

from pages.view_consignments import ViewConsignmentsPage

class AddConsignmentPage(BasePage):

    def __init__(self, driver):
        super(AddConsignmentPage, self).__init__(driver, self._title)
        self._title_uuid = get_random_uuid(7)
        ViewConsignmentsPage._title_uuid = self._title_uuid

Generate random value once for every issue Python

3 Answers3