Outline for November 9, 2012

Reading: § 16
Assignment Due: Friday, November 9, 2012 at 5:00 PM

  1. String methods
    1. Rule: methods that change, add, or delete characters do not alter the string to which they are applied; they return a new string that is a copy of the old string, suitably modified
  2. String methods: type of characters in string (return True or False) [strtype.py]
    1. S.isalpha() — True if only alphabetics (letters) in S
    2. S.isalnum() — True if only alphanumerics (letters or digits) in S
    3. S.isdigit() — True if only digits in S
    4. S.isspace() — True if only white space (blanks, tabs, newlines) in S
    5. S.isupper() — True if all letters in S are upper case
    6. S.islower() — True if all letters in S are lower case
  3. String methods: changing case of letters in string (return result of applying method) [strchcase.py]
    1. S.capitalize() — If the first character of S is a letter, capitalize it
    2. S.title() — Capitalize each word in S
    3. S.lower() — Change all upper case letters in S to lower case
    4. S.upper() — Change all lower case letters in S to upper case
    5. S.swapcase() — Change all upper case letters in S to lower case and vice versa
  4. String methods: stripping blanks from strings (return result of applying method) [strstrip.py]
    1. S.lstrip() — Delete all leading white spaces from S
    2. S.rstrip() — Delete all trailing white spaces from S
    3. S.lstrip() — Delete all leading and trailing white spaces from S
  5. String methods: find characters and substrings (return position or cause exception) [strfind.py]
    1. S.find(s) — Return the index of the first occurrence of s in S; −1 if s not in S
    2. S.index(s) — Return the index of the first occurrence of s in S; ValueError exception if s not in S
    3. S.rfind(s) — Return the index of the last occurrence of s in S; −1 if s not in S
    4. S.rindex(s) — Return the index of the last occurrence of s in S; ValueError exception if s not in S
  6. String methods: miscellaneous [strmisc.py]
    1. S.count(s) — Return the number of times s occurs in S
    2. S.startswith(s) — True if S starts with s
    3. S.endswith(s) — True if S ends with s
    4. S.replace(s,t) — Replace all occurrences of s with t in S

A PDF version is available here.
ECS 10, Basic Concepts of Computing
Fall Quarter 2012