By Mark Pilgrim
Mark Pilgrim's Dive Into Python three is a hands-on advisor to Python three and its modifications from Python 2. As within the unique e-book, Dive Into Python, every one bankruptcy begins with a true, entire 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 e-book includes:
* instance courses thoroughly rewritten to demonstrate robust new suggestions now to be had in Python three: units, iterators, turbines, closures, comprehensions, and lots more and plenty more
* a close case research of porting an immense library from Python 2 to Python 3
* A finished appendix of the entire syntactic and semantic alterations in Python 3
This is the best source for you if you want to port functions to Python three, or if you happen to wish to bounce into languages speedy and get going instantly.
Read or Download Dive Into Python 3 (2nd Edition) PDF
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Extra info for Dive Into Python 3 (2nd Edition)
App) to ensure that this version of Python is on the search path of your shell. You probably don’t need to change it. ■ INSTALLING PYTHON • “Fix system Python” should not be changed. It tells your Mac to use Python 3 as the default Python for all scripts, including built-in system scripts from Apple. This would be very bad because most of those scripts are written for Python 2, and they would fail to run properly under Python 3. Click the Install button to continue. Because it installs system-wide frameworks and binaries in /usr/local/bin/, the installer will ask you for an administrative password.
But that’s okay because the second argument is optional! Because the caller doesn’t specify, the second argument defaults to True, as defined by the function declaration. You can also pass values into a function by name (see Listing 1-7). Listing 1-7. 0 KB' >>> approximate_size(a_kilobyte_is_1024_bytes=False, 4000) File "
2 CHAPTER 1 ■ YOUR FIRST PYTHON PROGRAM Note that the function doesn’t define a return datatype. Python functions do not specify the datatype of their return value; they don’t even specify whether they return a value. ) ■ In some languages, functions (that return a value) start with function, and subroutines (that do not return a value) start with sub. There are no subroutines in Python. Everything is a function, all functions return a value (even if it’s None), and all functions start with def.