Error in implementing multithreading in a class

[srm]

Hello,
Just started learning multi threading concept in python as beginner..I want to print values
1 to 10 with two different functions using multithreading concept within a class ,my code is below:

import threading
class Class1:
    
   
    i=1
    j=1
    def f1():
       global i
       while i<=10:
            print(" I is now %d" %i)
            i=i+1
    def f2():
        global j 
        while j<=10:
            print("J is now %d" %j)
            j=j+1
    def Main1():
        t1=threading.Thread(target=f1())
        t2=threading.Thread(target=f2())
        t1.start()
        t2.start()
    
ob=Class1()

ob.Main1()

But getting error:

Error:
Traceback (most recent call last):
  File "C:/Threading1.py", line 26, in <module>
    ob.Main1()
TypeError: Main1() takes 0 positional arguments but 1 was given

[Larz60+]

Write it this way:

import threading


class Class1:
    def __init__(self, i, j):
        self.i = i
        self.j = j

    def f1(self):
       i = self.i
       while i<=10:
            print(f'I is now {i}')
            # print(" I is now %d" %i)
            i=i+1

    def f2(self):
        j = self.j
        while j<=10:
            print("J is now %d" %j)
            j=j+1

    def Main1(self):
        t1=threading.Thread(target=self.f1())
        t2=threading.Thread(target=self.f2())
        t1.start()
        t2.start()


if __name__ == '__main__':
    ob=Class1(1,1)
    ob.Main1()

output:

Output:
I is now 1
I is now 2
I is now 3
I is now 4
I is now 5
I is now 6
I is now 7
I is now 8
I is now 9
I is now 10
J is now 1
J is now 2
J is now 3
J is now 4
J is now 5
J is now 6
J is now 7
J is now 8
J is now 9
J is now 10

[Yoriz]

The () needs removing from the target=self.f1 & target=self.f2 for the thread to call them.