3.7. Exercises
3-1. Identifiers. Why are variable type declarations not used in Python?
3-2. Identifiers. Why are variable name declarations not used in Python?
3-3. Identifiers. Why should we avoid the use of the underscore to begin variable names with?
3-4. Statements. Can multiple Python statements be written on a single line?
3-5. Statements. Can a single Python statement be written over multiple lines?
3-6. Variable assignment.
(a) Given the assignment x, y, z = 1, 2, 3, what do x, y, and z contain?
(b) What do x, y, and z contain after executing: z, x, y = y, z, x?
3-7. Identifiers. Which of the following are valid Python identifiers? If not, why not? Of the invalid ones, which are keywords?
int32 40XL char $aving$ printf print _print a do this ...
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