Strings

Strings are a special case of an array or list, where each element is a character. There are many methods we can apply to them:

Concatenation

Concatenation is joining two strings together.
This can be done with the + sign. E.g:
- "Hello " + "World" = "Hello World".

Accessing a character

Remember, strings are just lists. So we can access a specific character in the exact same way as we access a list element:
- string[3] would get the fourth character.

Length of a string

The length of a string is given by the len function:
- len("Hello") would give 5.

Substrings

A substring is a part of a longer string.
In Python we take a substring using:
- stringname[startPos:endPos]
This takes a substring starting at the 'startPos'th character, and finishing at the 'endPos'th character.

1Introduction to Python

1.1Python

1.1.1Python

1.2Input & Output

1.2.1Input & Output

1.3Data Types

1.3.1Data Types

1.4Variables & Constants

1.4.1Variables & Constants

1.5Operators

1.5.1Arithmetic & Relational Operators

1.5.2Boolean & Assignment Operators 2

1.6Program Flow

1.6.1Selection

1.6.2Iteration

2Data Structures

2.1Lists & Strings

2.1.1Lists

2.1.2Strings

2.2File Handling

2.2.1File Handling

3Modularity

3.1Subroutines

3.1.1Subroutines

3.2Data Flow

3.2.1Data Flow

4Good Practice

4.1Naming & Whitespace

4.1.1Identifiers

4.1.2Whitespace

4.2Comments

4.2.1Comments

4.3Exceptions

4.3.1Exceptions

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