Python Programming Tutorial: 02 Basic data types

Variables do not need to be declared

Python variables do not need to be declared, you can type directly:

>>> a = 20

Then your memory will have a variable a, its value is 20, its type is integer (integer). Before you do not need to do any special statement, and the data type is Python automatically determined.

>>> print (a)

>>> print (type (a))

Then there will be the following output:

10
<class 'int'>

Recall variable name

If you want a to store different data, you do not need to delete the original variable can be directly assigned.

>>> a = 5.5
>>> print (a, type (a))

There will be the following output

5.5 <class 'float'>

Basic data type

a = 20          # int Integer

a = 5.5         # float floating point number

a = True        # true (True / False)

a = 'Hello!'    # String. Strings can also be enclosed in double quotation marks.