Introduction to Variables, Expressions and Statements

Value – one of the basic things a program works with, like a letter or a number. Examples 1, 2, and 'Hello, World!'.

The previously given values belong to different types:

-          1,2 are integers,

-          'Hello, World!' is a string – it's so called because it contains a „string“ of letters. You and the interpreter can identify strings because they are enclosed in quotation marks. String is a sequence of characters.

Important:

The print statement also works for integers. We used python command to start the interpreter.

>>> print 4 4 >>>print 'Hello World!' Hello World!

If you're not sure what type a value has, the interpreter can tell you.

>>>type('Hello, World!')

>>>type(17)

As mentioned before, strings belong to the type str and integers belong to the type int. Less obviously, numbers with a decimal point belog to a type called float, because these numbers are represented in a format called floating-point.

>>>type(4.2)