String

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Published May 5, 2021Updated Feb 24, 2023
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In computer science, sequences of characters are referred to as strings. Strings can be any length and can include any character such as:

  • Letters
  • Numbers
  • Symbols
  • Whitespace (spaces, tabs, new lines)

They are usually contained within a pair of 'single quotes' or "double quotes".

Here are some examples of strings:

message = "Hello, world!"
username = "@sonnynomnom"
old_password = "Tr0ub4dor&3"
new_password = "correcthorsebatterystaple"

Index

Like any other list, each character in a string has an index that denotes a character’s position.

message = 'Howdy!'
           012345

Note: In programming, the index starts from 0, so the index of the first character would be 0.

Finding the Character in a String Given its Index (Python)

In Python, to provide the index of the string message, add square brackets [ ] to find out the character at that position.

message = 'Hello, world'
print(message[0])
# Output: H
print(message[5])
# Output: ,

Example of Concatenation (Python)

It is also possible to concatenate strings together using + in some languages, such as Python and C++. To add a space between strings, an empty space can be put between quotation marks.

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Strings in Different Languages

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