# Learn the Bisection Method by Finding the Square Root of a Number - Step 15

### Tell us what’s happening:

‘You should assign the value of mid to low.’ This is what they keep telling even when I have already assigned.

### Your code so far

``````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

for _ in range(max_iterations):
mid = (low + high) / 2
square_mid = mid**2

# User Editable Region

if abs(square_mid - square_target) < tolerance:
root = mid
break
elif square_mid < square_target:
mid = low

# User Editable Region

``````

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### Challenge Information:

Learn the Bisection Method by Finding the Square Root of a Number - Step 15

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remember that assignment is right to left, you are assignming low to mid

1 Like

Oh… right. Thanks a lot for your help.

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