By Marty Alchin

The right way to leverage Django, the best Python net software improvement framework, to its complete capability during this complicated educational and reference. up to date for Django 1.5 and Python three, seasoned Django, moment variation examines in nice aspect the advanced difficulties that Python internet software builders can face and the way to resolve them. It presents in–depth information regarding complicated instruments and methods to be had in each Django set up, working the gamut from the idea of Django’s inner operations to genuine code that solves real–world difficulties for high–volume environments.

Pro Django, moment version is going above and past different books, leaving the fundamentals a ways at the back of and exhibiting how Django can do issues even its center builders by no means anticipated. by way of drawing at the dynamic nature of Python, you could write Django functions that extend the bounds of what you proposal attainable!

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How to leverage Django, the major Python internet program improvement framework, to its complete capability during this complicated instructional and reference. up to date for Django 1. five and Python three, professional Django, moment version examines in nice element the complicated difficulties that Python net software builders can face and the way to resolve them.

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23 CHAPTER 2 ■ VARIABLES AND ASSIGNMENT STATEMENTS Simple Math Now let’s move on to some simple math for use in assignment statements. Python and all computer languages include the following standard set of math operators: • + Add • - Subtract • / Divide • * Multiply • ** Raise to the power of • % Modulo (also known as remainder) • ( ) Grouping (we’ll come back to this) Let’s try some very simple math. For demonstration purposes, I’ll just use variables named x and y. In the Shell, try the following: >>> >>> >>> 15 >>> 3 >>> 54 >>> 1 >>> x = 9 y = 6 print x + y print x - y print x * y print x / y Everything seems fine until we try the divide.

I introduced the math operators in Python and showed a few sample programs. You saw how to add comments to code, learned about whitespace, and were introduced to the types of errors you will see when writing code. ), Python also has a number of what are called built-in functions. This chapter discusses the following topics: • Built-in functions • Using a function/function call • Arguments • Getting a result back from a function • The type function • Getting input from the user using raw_input • Conversion functions: int, float, and str • Building our first real programs • Concatenation, or adding strings together • Another programming exercise • Using function calls inside assignment statements Overview of Built-in Functions I’ll give you an analogy to explain what a built-in function is.

My puppy's age is 2 years and 5 months. ” We were told that some math operators had precedence over other ones. For example, look at this assignment statement: x = 5 + 4 * 9 / 6 What operations are done in what order? The teacher explained that the acronym PEMDAS would help us to figure out the order. PEMDAS described the precedence order as 1. Parentheses 2. Exponents 3. Multiplication 4. Division 5. Addition 6. Subtraction However, I thought that it was a terrible idea to have some implied, seemingly arbitrary ordering of math operators.