Why Use str on a doc string? : str « Buildin Function « Python

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Python » Buildin Function » str Screenshots  Why Use str on a doc string? def foo(): print 2  foo()  print foo.__doc__   foo.__doc__ == None print str(foo.__doc__) # The str function takes the null value and returns a string representation of it,  #can use either == None or is None, but is None is faster.                     Related examples in the same category 1.  str Function 2.  Used by print: user-friendly form 3.  Input and Output: str() function: return representations of values which are human-readable