The Quick Python Book, Third Edition

Appendix B. Exercise answers

B.1. Chapter 4

Try this: Variables and expressions

In the Python shell, create some variables. What happens when you try to put spaces, dashes, or other nonalphanumeric characters in the variable name? Play around with a few complex expressions, such as x = 2 + 4 * 5 – 6 / 3. Use parentheses to group the numbers in different ways, and see how that changes the result compared with the original ungrouped expression.

>>> x = 3 >>> y = 3.14 >>> y 3.14 >>> x 3 >>> big var = 12 File "<stdin>", line 1 big var = 12 ^ SyntaxError: invalid syntax >>> big-var Traceback (most recent call last): File "<stdin>", line 1, in <module> NameError: name 'big' is not defined >>> big&var Traceback (most recent call last): ...