# Learn the Bisection Method by Finding the Square Root of a Number - Step 11

### Tell us what’s happening:

I am not really understanding where to put the underscore (‘_’), I just need little help help understanding what this is about.

``````def square_root_bisection(square_target, tolerance=1e-7, max_iterations=100):
if square_target < 0:
raise ValueError('Square root of negative number is not defined in real numbers')
if square_target == 1:
root = 1
print(f'The square root of {square_target} is 1')
elif square_target == 0:
root = 0
print(f'The square root of {square_target} is 0')

else:
low = 0
high = max(1, square_target)
root = None

# User Editable Region

for i in range(max_iterations):

# User Editable Region

``````

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### Challenge Information:

Learn the Bisection Method by Finding the Square Root of a Number - Step 11

good attempt but you won’t be using any `i` variable so you don’t need it. That’s where you use the underscore instead, as a placeholder for a variable you don’t need.

I have tried that but it is not working, I have the underscore in the place of the “i” but it still does not work.