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```
def binary_search(data,key):
found=False
low=0
high=len(data)-1
while(not found and low<=high):
guess=(high+low)//2
if (key==data[guess]):
found=True
else:
if (key<data[guess]):
high=guess-1
else:
low=guess+1
if(not found):
guess=-1
return guess
def test():
seq = []
for i in range(1,1001):
seq.append(i)
for j in range(1,100):
is_pass = (binary_search(seq,j)==j-1)
assert is_pass == True, "fail the test when key is %d"%j
try:
is_pass = (binary_search(seq,-2)==0)
assert is_pass == True, "fail the test when key is -2"
except:
print('Exception when key is -2')
try:
is_pass = (binary_search(seq,1002)==999)
assert is_pass == True, "fail the test when key is 1002"
except:
print('fail the test when key is 1002')
try:
is_pass = (binary_search(seq,55.4)==54)
assert is_pass == True, "fail the test when key is 55.4"
except:
assert False, 'fail the test when key is 55.4'
try:
is_pass = (binary_search(seq,55.5)==54 or binary_search(seq,55.5)==55)
assert is_pass == True, "fail the test when key is 55.5"
except:
assert False, 'fail the test when key is 55.5'
if is_pass == True:
print("=========== Congratulations! Your have finished exercise 1! ============")
if __name__ == '__main__':
test()
```

I want it to do this:

If there doesn't exist, return with the index of the number whose value is closest to the object value. If

two or more found, just pick one of your choice.

I keep getting an error, can I get some help?

You