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Big Idea 3: Algorithms and Programming

Strings

1 min read•november 16, 2020

minnachow

Minna Chow


AP Computer Science Principles ⌨️

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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.
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_example = "APcomputerscienceprinciples" print (string_example[0:10])
This code returns the substring "APcomputer." In Python, index values begin at 0, and the character at the end index number (10) is not included.
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.

Concatenation Example

part_one = "Hello" part_two = "_World!" print (part_one + part_two)
The code returns:
Hello_World!

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