# 2.6. Expressions¶

An *expression* is a combination of values, variables,
and operators. A value all by itself is considered an expression, and so
is a variable, so the following are all legal expressions (assuming that
the variable `x`

has been assigned a value):

```
17
x
x + 17
```

If you type an expression in interactive mode, the interpreter
*evaluates* it and displays the result:

But in a script, an expression all by itself doesn’t do anything! This is a common source of confusion for beginners.

Type the following statements in the Python interpreter to see what they do:

```
5
x = 5
x + 1
```

- 5
- An expression is a combination of values, variables, and operators.
- x = 5
- An expression is a combination of values, variables, and operators.
- x + 1
- An expression is a combination of values, variables, and operators.
- all of the above
- All of the above are correct! An expression is a combination of values, variables, and operators.
- none of the above
- An expression is a combination of values, variables, and operators.

csp-10-2-2: Which of the following is an expression?

csp-10-2-3: Click on the expression(s) that will **not** return a value when typed in an interpreter.Try typing these expressions in a python interpreter to see what they do.

12 x = 73 x + 12 x += 52 #using += is the same as writing out x = x + 52

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