CHAPTER 3 - FUNCTIONS
Q: 1. Why are functions advantageous to have in your programs?
A: Avoid duplicating codes.
Q: 2. When does the code in a function execute: when the function is defined or when the function is called?
A: called.
Q: 3. What statement creates a function?
A: def statements.
Q: 4. What is the difference between a function and a function call?
A: A function consists of the def statement and the code in its def clause.
A function call is what moves the program execution into the function, and the function call evaluates to the function's return value.
Q: 5. How many global scopes are there in a Python program? How many local scopes?
A: Just one global scope, and a local scope is created whenever a function is called.
Q: 6. What happens to variables in a local scope when the function call returns?
A: destroyed.
Q: 7. What is a return value? Can a return value be part of an expression?
A: return value is the result of a function call. Return value can be part of an expression.
Q: 8. If a function does not have a return statement, what is the return value of a call to that function?
A: None.
Q: 9. How can you force a variable in a function to refer to the global variable?
A: global statement.
Q: 10. What is the data type of None?
A: NoneType
Q: 11. What does the import
areallyourpetsnamedericstatement do?
A: import a module named areallyourpetsnamederic .
Q: 12. If you had a function named bacon() in a module named spam, how would you call it after importing spam?
A: spam.bacon()
Q: 13. How can you prevent a program from crashing when it gets an error?
A: use try...except...
Q: 14. What goes in the try clause? What goes in the except clause?
A: potential error goes in the try clause, then if the error happens, goes in the except clause.