Download Python 201 by Michael Driscoll PDF

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By Michael Driscoll

Python 201 is the sequel to my first ebook, Python a hundred and one. if you happen to already comprehend the fundamentals of Python and now you need to visit the subsequent point, then this can be the e-book for you! This ebook is for intermediate point Python programmers in simple terms. There will not be any newbie chapters right here. This booklet is predicated onPython three.

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For example, I have had a use case where I needed the keys sorted so I could loop over them in order. keys() >>> keys dict_keys(['apple', 'orange', 'banana', 'pear']) >>> keys = sorted(keys) ['apple', 'banana', 'orange', 'pear'] >>> for key in keys: ... print (key, d[key]) ... items())) >>> new_d OrderedDict([('apple', 4), ('banana', 3), ('orange', 2), ('pear', 1)]) >>> for key in new_d: ... print (key, new_d[key]) ... apple 4 banana 3 orange 2 pear 1 Here we create our OrderedDict by sorting it on the fly using Python’s sorted built-in function.

Print('Write something to the stream') ... with write_to_stream: ... print('Write something else to stream') ... getvalue()) Write something to the stream Write something else to stream Here we create a nested context manager where they both write to StringIO, which is an in-memory text stream. The reason this works instead of raising a RuntimeError like before is that redirect_stdout is reentrant and allows us to call it twice. Of course, a real world example would be much more complex with more functions calling each other.

I hope you found each of these collections interesting. They may be of great use to you in your own coding life. 5 that is known as the with statement. This new keyword allows a developer to create context managers. But wait! What’s a context manager? They are handy constructs that allow you to set something up and tear something down automatically. For example, you might want to open a file, write a bunch of stuff to it and then close it. This is probably the classic example of a context manager.

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