What is the indentation error in Python?

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Spacing should be even and uniform throughout one’s code. Improper indentation could cause an IndentationError or cause the program to do something unexpected. The following example raises an IndentationError:

if True:
print "true"

If you add indentation where it doesn’t belong, an IndentationError will be raised:

if True:
a = 6
b = 5

If you forget to un-indent, functionality could be lost. In this example, None is returned instead of the expected False:

def isEven(a):
if a%2 ==0:
return True
# this next line should be even with the if
return False
print isEven(7)