Learning Outcomes:

Upon successful completion of this lesson, you will be able to:

• Explain the use of common string functions to make modification to string.
• Apply string slicing techniques to manipulate strings.

Strings (about 31 mins)

Lesson 1 of 10: What is a String?

A string is a sequence of characters. A string literal uses one of the following:

• single quote (‘)
• double quotes (“”)
• triple single (''') or triple double quotes(“””)

A string is immutable.

Python Strings (about 3 mins)

String Data Type

The following statement assigns a variable s with a string literal 'matrix': s = 'matrix

The first character can be specified using the square bracket with an index value ‘0’. The statement print(s[0]) displays m on the screen.

An Index Error occurred if you indexed beyond the end of a string. The statement print(s[6]) will encounter a runtime error.

• Print the characters in a string with a for loop