New PDF release: A Python Book: Beginning Python, Advanced Python, and Python

By Dave Kuhlman

This record is a self studying record for a path in Python programming. This direction 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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Additional info for A Python Book: Beginning Python, Advanced Python, and Python Exercises

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Or, use a dictionary of functions. 1 The def statement The def statement is used to define functions and methods.  It produces a function/method (object) and binds it to a variable in the current name­space. Although the def statement is evaluated, the code in its nested block is not executed.  Pythonic wisdom: If it's not tested, it's broken. 2 Returning values The return statement is used to return values from a function.  Using commas actually returns a single tuple. The default value is None.

1 The None value/type The unique value None is used to indicate "no value", "nothing", "non­existence", etc. There is only one None value; in other words, it's a singleton.  Example: >>> flag = None >>> >>> if flag is None: ... print 'clear' Page 35 A Python Book ... clear >>> if flag is not None: ... print 'hello' ... 2 Boolean values True and False are the boolean values.  All other values, including True, act as true values.  A set does not contain duplicates. Sets support several set operations, for example: union, intersection, difference, ...

Solution: count = 0 while True: count += 1 if count > 5: break print count ● Notes: ○ A for statement that uses range() or xrange() would be better than a while statement for this use. 8 try: except: statement Exceptions are a systematic and consistent way of processing errors and "unusual" events in Python. Caught and un­caught exceptions ­­ Uncaught exceptions terminate a program. The try: statement catches an exception. Almost all errors in Python are exceptions. Evaluation (execution model) of the try statement ­­ When an exception occurs in the try block, even if inside a nested function call, execution of the try block ends and the except clauses are searched for a matching exception.

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


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