Syntax error not understood

[raady07]

Hi, 

Completely new user for Python coding. Please help to understand the error. 

import math 

def euclideanDistance(instance1,instance2, length):
    distance = 0
    for x in range(length):
        distance += pow((instance1[x]-instance2[x],2)
        return math.sqrt(distance)

it displays the following error 

Error:
File "test6.py", line 9
    return math.sqrt(distance)
         ^
SyntaxError: invalid syntax

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please ignore the thread it was just a syntax error

distance += pow((instance1[x]-instance2[x],2))