Statements and Expressions¶

• A statement is an instruction that the Python interpreter can execute.
• We have only seen the assignment statement so far.
• Some other kinds of statements that we’ll see shortly are while statements, for statements, if statements, and import statements.

• An expression is a combination of values, variables, operators, and calls to functions. Expressions need to be evaluated.
• If you ask Python to print an expression, the interpreter evaluates the expression and displays the result.

We’ve previously seen the print and the type functions, so len is our third example of a function!

• The evaluation of an expression produces a value, which is why expressions can appear on the right hand side of assignment statements.
• A value all by itself is a simple expression, and so is a variable.
• Evaluating a variable gives the value that the variable refers to.