3.4 Strings

What are Strings?

Strings, as mentioned earlier, are an ordered list of characters. You can navigate through them using index values, just like how you can navigate through a list using index values. 

Although you can't perform mathematical operations with strings, you can still manipulate them. 

Slicing

A substring is a part of an existing string. For example, "APcomputer" would be a substring of the string "APcomputerscienceprinciples." The process of creating a substring is known as slicing.

There are many different ways to slice a string: here's a basic example.

string_example1 = "APcomputerscienceprinciples"
print (string_example1[0:10])

This code will print the substring "APcomputer". In Python, index values begin at 0, and the character at the end index number (10) is not included.

Here's another example of slicing a string.

string_example2 = "APcomputerscienceprinciples"
print (string_example[2:9])

This code returns the substring "compute". 

Concatenation

You can also concatenate strings. String concatenation occurs when two or more strings are joined end to end to make a new string. This is usually represented by the + symbol.

part_one = "Hello"
part_two = "_World!"
print (part_one + part_two)

The code returns:

Hello_World!