What underscore is doing in python

Question

for _ in range():

Answer 1

it is quite common to use this as "disposable loop variable" when you do not need the loop-variable inside the loop:

for _ in range(10):
print("Hello world")

other than a code like this where you use the loop-variable inside the loop:

for i in range(10):
do_something(i)

Answer 2

_ is just a local variable name for the loop.

Instead of _ it could be i, j, k or any other name

Answer 3

Thanks a lot

Answer 4

def fit(self, xTest, yTest)
for _ in ():
self.update_weights()