Outline for November 5, 2012

Reading: § 11
Assignment Due: Friday, November 9, 2012 at 5:00 PM

1. Sequences
   1. Sequences are a series of values in a particular order
   2. In Python predominantly strings and lists but also sets and tuples
2. Strings
   1. Sequence of characters (characters are strings of length 1)
   2. Strings are immutable; really important for functions
3. Basic string operations
   1. +, concatenation for strings
   2. *, repetition repeats given value
   3. len() returns length of sequence
   4. s in str returns True if s is a substring of str, False otherwise
4. Indexing, var[position]
   1. Count from 0 to len(var)−1
   2. Position can be a negative number to count from right
5. Assignment with indexing doesn’t work as strings immutable;
   x = 'hEllo'; x[1] = 'e' produces an error
6. Slicing, var[start:end]
   1. Value at index end not included in slice
   2. If omitted, starting value defaults to 0 and ending value defaults to last index + 1
   3. Can use negative index
7. Example program [strstuff.py]

ECS 10, Basic Concepts of Computing Fall Quarter 2012