Lecture 7: October 17, 2019

Reading: §6
Due: Homework 2, due on October 24 at 11:59pm


  1. Greetings and felicitations!
  2. String methods: 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
  3. 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
  4. 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
  5. 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
  6. 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
  7. 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

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Matt Bishop
Office: 2209 Watershed Sciences
Phone: +1 (530) 752-8060
Email: mabishop@ucdavis.edu
MHI 289I Programming in Health Informatics
Version of October 15, 2019 at 7:50PM

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