By Michael Driscoll

Python 201 is the sequel to my first publication, Python one zero one. when you already recognize the fundamentals of Python and now you need to visit the subsequent point, then this is often the booklet for you! This publication is for intermediate point Python programmers in basic terms. There will not be any newbie chapters right here. This publication relies onPython three.

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This allows us to create an overloaded function that can handle multiple types. Decimal types as the first argument. Dec\ imal'> You may have noticed this already, but because of the way all these functions were written, you could stack the decorators to handle all the cases in the previous example and this example into one overloaded function. However, in a normal overloaded case, each overload would call different code instead of doing the same thing. wraps There is a little known tool that I wanted to cover in this section.

The first line we import namedtuple as before. Next we create a Parts dictionary. So far, so good. Now we’re ready for the weird part. Here we create our namedtuple class and name it ‘Parts’. The second argument is a list of the keys from our dictionary. The last piece is this strange piece of code: (Parts)**. The double asterisk means that we are calling our class using keyword arguments, which in this case is our dictionary. 0, id_num='1234', desc='Ford Engine') So here we do the same thing as before, except that we create the class first, then we call the class with our dictionary to create an object.

It sorts them and then passes them into the OrderedDict, which will retain their order. Thus when we go to print our the keys and values, they are in the order we expect. If you were to loop over a regular dictionary (not a sorted list of keys), the order would change all the time. 22 Note that if you add new keys, they will be added to the end of the OrderedDict instead of being automatically sorted. Something else to note about OrderDicts is that when you go to compare two OrderedDicts, they will not only test the items for equality, but also that the order is correct.

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