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

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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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