​Statements & Expressions

• ​Python is an interpreted high-level programming language.

• ​A complete computer command is called a statement.

• ​For example: print("Hello World")

• ​An expression evaluates to a new value.

• ​For example: 2*2

​Variables

• ​We can store values in variables.

• ​To do this we use the assignment operator =

• For example: answer = 2*2

• ​Variables store values not expressions

• ​Good variable names describe the data they contain

​Data Types

• All variables have a data type

• ​ints are whole numbers

• ​floats are decimal numbers

• ​strings are text

• ​Variables can be of any data type

• ​In Python, we don't need to declare variables, we can just use them by assigning a value

• ​For example:

​Strings

• ​We can define strings on multiple lines

• We can combine string values to make a new string.

• ​Strings are combined using the + operator.

• This is called string concatenation.

• Strings are concatenated without spaces.

​Comments

• We use comments to explain our code.

• Comments are ignored by programming languages.

• A comment in Python begins with the # character

• For example: #this is a comment​

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​User Input

• ​We can also use variables to store user input.

• ​We use input() to assign a user value to a variable.

• ​This requires a prompt message for the user.

• ​This is printed before they can enter data.

• ​For example:

​Working with Strings & Ints

• ​Python always accepts user input as a string.

• ​So we cannot perform calculations with it.

• ​We need to convert the input string to an int using the int() function

• ​For example: