Introduction to basic data types and variable declarations for Python basic tutorials

variables do not need to be declared

Python variables do not need to be declared, you can enter directly:
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>>>a = 10

Then your memory has a variable a, its value is 10, its type is an integer (integer). You don't need to make any special statements before, and 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

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

Recycle variable name

If you want a to store different data, you don't need to delete the original variable to directly assign the value. The
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>>>a = 1.3

>>>print A,type (a)

will have the following output
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1.3

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

basic data type

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a=10 # int integer

a=1.3 # F Loat floating-point

A=true # Truth (true/false)

a= ' hello! ' # string

above is the most commonly used data type, and in the case of strings, double quotes are also possible.

(in addition to other data types, such as fractions, characters, complex numbers, etc.)

Summary

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

Type (): Query data type

Integer, floating-point number, truth value, string

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