September 2013
Intermediate to advanced
350 pages
9h 38m
English
Content preview from Practical Programming, 2nd Edition
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Expressions and Values: Arithmetic in Python
You’re familiar with mathematical expressions like 3 + 4 (“three plus four”) and 2 - 3 / 5 (“two minus three divided by five”); each expression is built out of values like 2, 3, and 5 and operators like + and -, which combine their operands in different ways. In the expression 4 / 5, the operator is “/” and the operands are 4 and 5.
Expressions don’t have to involve an operator: a number by itself is an expression. For example, we consider 212 to be an expression as well as a value.
Like any programming language, Python can evaluate basic mathematical expressions. For example, the following expression adds 4 and 13:
| | >>> 4 + 13 |
| | 17 |
The >>> symbol is called a prompt. When you opened ...
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