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In this program, the approximate_size function has a docstring: def approximate_size(size, a_kilobyte_is_1024_bytesTrue 'Convert a file size to human-readable form. Keyword arguments: size - file size in bytes a_kilobyte_is_1024_bytes - if True (default use multiples of 1024 if False, use multiples of 1000 Returns: string ' Every function deserves a decent docstring. This means the argument is optional ; you can call the function without it, and Python will act as if you had called it with True as a second parameter. Now look at the bottom of the script: if _name_ main print(approximate_size(, False) print(approximate_size( ) This calls the approximate_size function with two arguments. Its fast; the bulk of it is written in C, like the Python interpreter itself. It can store arbitrarily complex Python data structures. What can the pickle module store? All the native datatypes that Python supports: booleans, integers, floating point numbers, complex numbers, strings, bytes objects, byte arrays, and None.


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