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# If you put a string at the beginning of a function, it is stored as part of the function and is called a docstring.
# __doc__ is a function attribute.
# The double underscores mean that this is a special attribute.
def square(x):
'Calculates the square of the number x.'
return x*x
# The docstring may be accessed like this:
print square.__doc__
help(square)
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