Dave Kuhlman's A Python Book: Beginning Python, Advanced Python, and Python PDF

By Dave Kuhlman

This record is a self studying rfile for a path in Python programming. This path comprises (1) a component for newbies, (2) a dialogue of a number of complicated issues which are of curiosity to Python programmers, and (3) a Pythonworkbook with plenty of routines.

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Extra info for A Python Book: Beginning Python, Advanced Python, and Python Exercises

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Page 36 A Python Book Python objects are first­class objects. Expressions are evaluated. Statements are executed. Functions (1) are objects and (2) are callable.  Polymorphism. Classes ­­ (1) encapsulation; (2) data hiding; (3) inheritance. An overview of the structure of a typical class: (1) methods; (2) the constructor; (3) class (static) variables; (4) super/subclasses. 1 Assignment statement Form ­­ target = expression.  Left and right sides must have equivalent structure.  Example: In [1]: a = range(10) In [2]: a Out[2]: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] In [3]: a[2:5] = [11, 22, 33, 44, 55, 66] In [4]: a Out[4]: [0, 1, 11, 22, 33, 44, 55, 66, 5, 6, 7, 8, 9] ● Attribute reference ­­ Example: >>> class MyClass: ...

Do not use mutable objects as default values. : In [14]: test(32, 'aa', 'bb', otherparam='xyz') 32 ('aa', 'bb') {'otherparam': 'xyz'} Normal arguments must come before default arguments which must come before keyword arguments. ● A function that does not explicitly return a value, returns None. ● In order to set the value of a global variable, declare the variable with global.  Solution: >>> def t(x): ... print 'x: %s' % x ... return '[[%s]]' % x ... >>> t(3) x: 3 '[[3]]' ● Write a function that takes a variable number of arguments and prints them all.

Examples: class SomeClass(object): @classmethod def HelloClass(cls, arg): pass ## HelloClass = classmethod(HelloClass) @staticmethod def HelloStatic(arg): pass ## HelloStatic = staticmethod(HelloStatic) # # Define/implement a decorator. def wrapper(fn): def inner_fn(*args, **kwargs): print '>>' result = fn(*args, **kwargs) print '<<' return result return inner_fn # # Apply a decorator. @wrapper def fn1(msg): pass ## fn1 = wrapper(fn1) Notes: ● ● ● The decorator form (with the "@" character) is equivalent to the form (commented out) that calls the decorator function explicitly.

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A Python Book: Beginning Python, Advanced Python, and Python Exercises by Dave Kuhlman


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