A Tutorial Introduction in Visual Studio .NET

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A Tutorial Introduction
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If you try the preceding example and it fails with a SyntaxError, you are probably using Python 3 If this is the case, you can continue to follow along with this chapter, but be aware that the print statement turned into a function in Python 3 Simply add parentheses around the items to be printed in the examples that follow For instance:
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>>> print("Hello World") Hello World >>>
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Putting parentheses around the item to be printed also works in Python 2 as long as you are printing just a single item However, it s not a syntax that you commonly see in existing Python code In later chapters, this syntax is sometimes used in examples in which the primary focus is a feature not directly related to printing, but where the example is supposed to work with both Python 2 and 3
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Python s interactive mode is one of its most useful features In the interactive shell, you can type any valid statement or sequence of statements and immediately view the results Many people, including the author, even use interactive Python as their desktop calculator For example:
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>>> 6000 + 452350 + 13412 10657620000000001 >>> _ + 819232 18849940000000002 >>>
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When you use Python interactively, the special variable _ holds the result of the last operationThis can be useful if you want to save or use the result of the last operation in subsequent statements However, it s important to stress that this variable is only defined when working interactively If you want to create a program that you can run repeatedly, put statements in a file such as the following:
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# helloworldpy print "Hello World"
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Python source files are ordinary text files and normally have a py suffixThe # character denotes a comment that extends to the end of the line To execute the helloworldpy file, you provide the filename to the interpreter as follows:
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% python helloworldpy Hello World %
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On Windows, Python programs can be started by double-clicking a py file or typing the name of the program into the Run command on the Windows Start menuThis launches the interpreter and runs the program in a console window However, be aware that the console window will disappear immediately after the program completes its execution (often before you can read its output) For debugging, it is better to run the program within a Python development tool such as IDLE On UNIX, you can use #! on the first line of the program, like this:
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#!/usr/bin/env python print "Hello World"
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The interpreter runs statements until it reaches the end of the input file If it s running interactively, you can exit the interpreter by typing the EOF (end of file) character or by selecting Exit from pull-down menu of a Python IDE On UNIX, EOF is Ctrl+D; on Windows, it s Ctrl+Z A program can request to exit by raising the SystemExit exception
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>>> raise SystemExit
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The program in Listing 11 shows the use of variables and expressions by performing a simple compound-interest calculation
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Listing 11
Simple Compound-Interest Calculation
Initial amount Interest rate Number of years
principal = 1000 # rate = 005 # numyears = 5 # year = 1 while year <= numyears: principal = principal print year, principal year += 1
* (1 + rate) # Reminder: print(year, principal) in Python 3
The output of this program is the following table:
1 2 3 4 5 10500 11025 1157625 121550625 12762815625
Python is a dynamically typed language where variable names are bound to different values, possibly of varying types, during program executionThe assignment operator simply creates an association between a name and a value Although each value has an associated type such as an integer or string, variable names are untyped and can be made to refer to any type of data during executionThis is different from C, for example, in which a name represents a fixed type, size, and location in memory into which a value is storedThe dynamic behavior of Python can be seen in Listing 11 with the principal variable Initially, it s assigned to an integer value However, later in the program it s reassigned as follows:
principal = principal * (1 + rate)
This statement evaluates the expression and reassociates the name principal with the result Although the original value of principal was an integer 1000, the new value is now a floating-point number (rate is defined as a float, so the value of the above expression is also a float)Thus, the apparent type of principal dynamically changes from an integer to a float in the middle of the program However, to be precise, it s not the type of principal that has changed, but rather the value to which the principal name refers A newline terminates each statement However, you can use a semicolon to separate statements on the same line, as shown here:
principal = 1000; rate = 005; numyears = 5;