Introduction to basic data types and variable declarations in the Python Basics tutorial _python

Variable does not need to be declared

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

Copy Code code as follows:

>>>a = 10

Then you have a variable in the memory of a, its value is 10, its type is integer (whole number). You don't have to make any special statements before, and the data types are automatically determined by Python.

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>>>print A

>>>print type (a)

Then there will be the following output:

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10
<type ' int ' >

Here, we learned a built-in function type () to query the type of the variable.

Reclaim Variable Name

If you want a to store different data, you don't have to delete the original variable to assign the value directly.

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>>>a = 1.3

>>>print A,type (a)

will have the following output

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1.3 <type ' float ' >

We see another use of print, which is that print is followed by multiple outputs, separated by commas.

Basic data types

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a=10 # int Integer

a=1.3 # Float floating-point number

A=true # Truth (true/false)

A= ' hello! ' # string

These are the most commonly used data types, and you can use double quotes for strings.

(in addition, there are scores, characters, complex numbers and other data types, interested can learn)

Summarize

Variables do not need to be declared, do not need to be deleted, can be directly recycled apply.

Type (): Query data type

Integers, floating-point numbers, truth values, strings