Lecture 9: October 29, 2019

Due: Homework 3, due on November 8 at 11:59pm

1. Tuples
   1. Used to group data
   2. Like lists, but immutable
2. isinstance(obj,type) function
   1. type is bool, float, int, list, str, tuple
3. Recursion
   1. n factorial [nfact.py]
4. Thinking recursively [recfun.py]
   1. First: think of the recursive case (write the problem in terms of something involving a smaller instance of the problem)
   2. Next: think of base case (when to stop)
   3. Example: Find the length of a string
   4. Example: Does the string only have alphabetic characters in it?
   5. Example: Find the maximum element of a list
   6. Example: Construct a string from a list of strings
   7. Example: Reverse a string
5. Recursion
   1. Palindromes [palindrome.py]
   2. Fibonacci numbers [rfib.py]
   3. Sum of digits [sumdigits.py]
   4. Greatest common divisor [gcd.py]
   5. Nested lists: is an item in a list? [isinlist.py]
   6. Tower of Hanoi [hanoi.py]

Matt Bishop Office: 2209 Watershed Sciences Phone: +1 (530) 752-8060 Email: [email protected]

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