1. IST256 : Applications Programming for Information Systems
Strings

2. Agenda Connection Activity Teaching: Practice Activity Strings
String Library
Practice Activity
Sentiment Analyzer

3. Connect Activity Double-Stack Kahoot!:
Double the Kahoot… double the fun.
Top 3 Get a Prize!
Loops:
Functions:

4. Recall: Strings Name = ‘Fudge’ Name[1] = ‘u’
Strings are index able sequences of characters.
The characters inside the string are immutable.
Example:
Name = ‘Fudge’
Immutable means we can’t do this:
Name[1] = ‘u’

5. String functions galore:
Built In String Functions: sequence-type-str
These just work Name.upper()
The Python String Library:
You must import String before you can use them.

6. Watch Me Code Let’s explore built-in string functions:
upper, lower, title, capitalize
Isupper, islower, isdigit
find, replace
split

7. Help me Code Write a python function to: HINT:
Return true if a string is a number eg. “34” “-34” “3.4” “-3.4”
Return false otherwise
HINT:
Use replace, isdigit

8. Watch Me Code
Let’s explore the string library Import string Remove punctuation from a string

9. Now You Code “Twitter Sentiment Analyzer 1.0”
User inputs a Tweet, program outputs a score:
>0 means tweet was POSITIVE
<0 means tweet was NEGATIVE
0 means tweet was NEUTRAL
Create list of “positive” words; list of “negative” words.
Add 1 for each positive word in the string, subtract 1 for each negative word.
Use built in string functions to help you.