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Basically, this translates to us telling Python that we want to use this module. e. the system. 55 Python en:Modules When Python executes the import sys statement, it looks for the sys module. In this case, it is one of the built-in modules, and hence Python knows where to find it. e. path variable. If the module is found, then the statements in the body of that module is run and then the module is made available for you to use. Note that the initialization is done only the first time that we import a module.

Run import this to learn more and see this discussion (http:/ / stackoverflow. com/ questions/ 228181/ zen-of-python) which lists examples for each of the principles. The dir function You can use the built-in dir function to list the identifiers that an object defines. For example, for a module, the identifiers include the functions, classes and variables defined in that module. When you supply a module name to the dir() function, it returns the list of the names defined in that module. When no argument is applied to it, it returns the list of names defined in the current module.

E. you cannot modify tuples. Tuples are defined by specifying items separated by commas within an optional pair of parentheses. e. the tuple of values used will not change. py Number of animals in the zoo is 3 Number of cages in the new zoo is 3 All animals in new zoo are ('monkey', 'camel', ('python', 'elephant', 'penguin')) Animals brought from old zoo are ('python', 'elephant', 'penguin') Last animal brought from old zoo is penguin Number of animals in the new zoo is 5 How It Works: The variable zoo refers to a tuple of items.

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