7/9 unindent does not match indentation level


I don't know why the console keeps returning

File "python", line 26
print grades_variance(grades)
IndentationError: unindent does not match any outer indentation level

My code is:

grades = [100, 100, 90, 40, 80, 100, 85, 70, 90, 65, 90, 85, 50.5]

def print_grades(grades):
for grade in grades:
print grade

def grades_sum(grades):
total = 0
for grade in grades:
total += grade
return total

def grades_average(grades):
sum_of_grades = grades_sum(grades)
average = sum_of_grades / float(len(grades))
return average

def grades_variance(grades):
average = grades_average(grades)
variance = float(0)
for i in grades:
variance+= float((i-average)**2)
return variance

print grades_variance(grades)


You are simply getting this error because unindent does not match any outer indentation level. It means there is a mistake somewhere in your code with the spaces you have to use after each for:, if: etc. elements. Try to make sure that every line after these elements have 4 spaces.