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

By Dave Kuhlman

This rfile is a self studying rfile for a direction in Python programming. This path includes (1) an element for newbies, (2) a dialogue of a number of complex subject matters which are of curiosity to Python programmers, and (3) a Pythonworkbook with plenty of routines.

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

Sample text

Declare the variable as global. The global statement declares one or more variables, separated by commas, to be global.  See epydoc for a suggested format.  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.

The use of classmethods and staticmethod will be explained later in the section on object­oriented programming.  Remember that in order to use a function, it must be defined in the current module or imported by the current module or be a built­in. The form that explicitly calls the decorator function (commented out in the example above) is equivalent to the form using the "@" character. 2 lambda Use a lambda, as a convenience, when you need a function that both: is anonymous (does not need a name) and contains only an expression and no statements.

User defined exception classes ­­ subclasses of Exception.  One answer: You want a user of your code to catch your exception and no others.  The exception object (usually an instance of some exception class) is bound to exp. A more "modern" syntax is: except SomeExceptionClass as exp: So: class MyE(ValueError): pass try: raise MyE() except ValueError: print 'caught exception' will print "caught exception", because ValueError is a base class of MyE. html.  Solution: class MyE(Exception): Page 50 A Python Book pass ● Write a try:except: statement that raises your exception and also catches it.

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