Outline for May 6, 2014

Reading: text, § 8
Due: Homework #2, due May 9, 2014 (Note extension)
  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]

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