Question

I`m new to python and I have the stupid problem with passing an argument.

class MyClass():

    @staticmethod
    def add_group(name, parent_id):
        print "add_group method, name: %s, parent_id: %s" % (name, parent_id)

Other class method

def task():
    print "task method, name: %s, group_id: %s" % (name, parent_id)
    MyClass.add_group(name, parent_id)

Output:

task method, name: blabla, group_id: 15

add_group method, name: blabla, parent_id: (15L,)

What’s happened with parent_id argument? Any help would be appreciated!

Answer 1

In one case you passed in 15, in the other case you passed in (15L,) (i.e. a tuple whose first value is 15L, that is long(15) or an arbitrary-precision number representing 15.)

Numbers naturally transform into longs when they become very large values such as 10**20, but in this case it is very small; the only way I can think of you would have gotten a long you weren’t expecting was doing something like 10**20 - 10**20 + 15, or somehow some other value in your program is a long.

edit: Specifically, the other value in your program may be being returned by a library you are using.