Outline for February 6, 2012

Reading: §8

1. Sequences
   1. Accustomed to use in for loops (for i in range(5):)
   2. Sequences are a series of values in a particular order
   3. 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. 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
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. String module import string
   1. String methods: s.capitalize(), s.replace(old, new), s.find(sub), s.rfind(sub), s.upper(), s.lower()

ECS 10, Basic Concepts of Computing Winter Quarter 2012