Outline for February 5, 2018

Reading: §6

1. Example program [strarray.py]
2. String module: import string
   1. String constants: string.ascii_letters, string.digits, string.punctuation, string.whitespace
3. 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
4. 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
5. 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
6. 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.strip() — Delete all leading and trailing white spaces from S
7. 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
8. 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
9. Lists
   1. Sequence of values (ints, floats, strings, other lists, etc.)
   2. Denoted by square brackets [ ] with values separated by commas
   3. Lists are mutable
   4. How to create a list
10. Program to print words in a line [lines.py]

Matt Bishop Department of Computer Science University of California at Davis Davis, CA 95616-8562 USA

Last modified: Version of February 2, 2018 at 9:29PM Winter Quarter 2018 You can get a PDF version of this