New PDF release: Dive Into Python 3 (2nd Edition)
By Mark Pilgrim
Mark Pilgrim's Dive Into Python three is a hands-on consultant to Python three and its adjustments from Python 2. As within the unique ebook, Dive Into Python, every one bankruptcy starts off with a true, whole code pattern, proceeds to select it aside and clarify the items, after which places all of it again jointly in a precis on the end.
This booklet includes:
* instance courses thoroughly rewritten to demonstrate strong new techniques now to be had in Python three: units, iterators, turbines, closures, comprehensions, and masses more
* a close case research of porting an enormous library from Python 2 to Python 3
* A finished appendix of all of the syntactic and semantic adjustments in Python 3
This is the appropriate source for you if you want to port functions to Python three, or when you wish to leap into languages quick and get going without delay.
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Additional resources for Dive Into Python 3 (2nd Edition)
This is the online help utility. org/tutorial/. Enter the name of any module, keyword, or topic to get help on writing Python programs and using Python modules. To quit this help utility and return to the interpreter, just type "quit". To get a list of available modules, keywords, or topics, type "modules", "keywords", or "topics". Each module also comes with a one-line summary of what it does; to list the modules whose summaries contain a given word such as "spam", type "modules spam". help> Note that the prompt changes from >>> to help>.
3. This calls the approximate_size() function with False for the argument named a_kilobyte_is_1024_bytes and 4000 for the argument named size. (See? ) 4. This call fails because you have a named argument followed by an unnamed (positional) argument, and that never works. Reading the argument list from left to right, once you have a single named argument, the rest of the arguments must also be named. 5. This call fails, too, for the same reason as the previous call. Is that surprising? After all, you passed 4000 for the argument named size, so that False value was meant for a_kilobyte_is_1024_bytes argument.
Now look at the bottom of the script (see Listing 1-6). Listing 1-6. The if __name__==’__main__’ Block if __name__ == '__main__': print(approximate_size(1000000000000, False)) print(approximate_size(1000000000000)) (1) (2) 3 CHAPTER 1 ■ YOUR FIRST PYTHON PROGRAM The following notes refer to the numbered lines in Listing 1-6: 1. This calls the approximate_size() function with two arguments. Within the approximate_size() function, a_kilobyte_is_1024_bytes will be False because you explicitly passed False as the second argument.
Dive Into Python 3 (2nd Edition) by Mark Pilgrim