Django by Bonnie Christensen

By Bonnie Christensen

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Figure 3-6. Use the up/down cursor keys to recall previously typed lines and the left-right keys to edit Arithmetic Operators Arithmetic operators are short form symbols used to perform arithmetic on numbers. You will have used the majority of them at school; Python uses some different symbols compared to the ones used in school. Operator Description Example + Addition; the two values either side of the operator are added together 4 + 5 will give 9 - Subtraction; the value on the right-hand side of the operator is subtracted from the value on the left-hand side 5 - 4 will give 1 * Multiplication; the two values on either side of the operator are multiplied together 2 * 3 will give 6 (continued) 18 Chapter 3 ■ Introducing Python Operator Description Example / Division; divides the value on the left-hand side of the operator with the value on the right-hand side 10 / 5 will give 2 % Modulus; divides the value on the left-hand side of the operator with the value on the right-hand side to produce the remainder 5 / 2 will give 1 ** Exponent; raises the value on the left-hand side by the power supplied on the right-hand side 2 ** 4 will give 16.

It is acting as a control for the loop. In fact, we give any variable that controls flow the name control variable. Again, this is just a name I’ve given the variable. I could have called in ‘n’ or ‘j’ or ‘fred’. Control variables tend to have short names. I chose this one because we're iterating through integers or whole numbers and ‘i’ seemed appropriate for the task. The format of a ‘for’ loop is: for condition: Action(s) Where ‘condition’ is any statement that generates a list. The range() function The range() function is provided by Python and as such is referred to as an intrinsic function.

To remove 'Sloan' from the dictionary 'numbers': >>> del numbers['Sloan'] >>> numbers {'Frank': '216-555-1234', 'Kevin': '212-555-4321'} >>> Conclusion We've seen that Python offers us three different types of containers that provide options for our programs. The tuple can be used to group together like items that are immutable (cannot be changed). Use a tuple to define a structure line a point in space. The properties of a point in space are its x and y coordinates. These two elements don't change and you very rarely iterate (loop) through them.

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