A detailed description of Python's basic data types

This article is mainly to share with you a detailed description of Python basic data types, the need for small partners to see

This article is mainly to share with you a detailed description of Python basic data types, the need for small partners to see.

How Python files are run

1. Python's own shell

2. Go to the directory where the Python file is located, and then run
   Python xxx.py (e.g. C:\work>python hello.py)

3.pythoncharm and Other Ides

4.sublime Text Editor with plug-in

Data type

Python data types are divided into mutable types and immutable types

Python Basic data type

Where the mutable type is

Number (numeric):

includes int, float, bool, complex (plural).

Note:

1. Python can assign values to multiple variables at the same time, such as a, B = 1, 2.

2. A variable can point to different types of objects by assigning values.

3, the value of division (/) always returns a floating-point number, to get the integer use//operator.

4. In mixed calculations, Python converts an integer to a floating-point number.

5. A**b

6, plural a+bj or complex (A, B)

String (String):

List (lists)

Dictionary (dictionary)

Sets (collection)

A collection (set) is a sequence of unordered, non-repeating elements.
The basic function is to test the membership and remove duplicate elements.
You can use curly braces {} or set ()

function to create a collection, note: Creating an empty collection must be set () instead of {}, because {} is used to create an empty dictionary.

#!/usr/bin/python3student = {' Tom ', ' Jim ', ' Mary ', ' Tom ', ' Jack ', ' Rose '}print (student)   # Output set, duplicate elements are automatically removed # member test if (' Rose ' in student):    print (' Rose is in the collection ') Else:    print (' Rose is not in the collection ') # set can perform set operation A = set (' Abracadabra ') b = Set (' Alaca Zam ') print (a) print (a) A and B     difference set print (a | b)     # A and B set print (A & B)     # A and B intersection print (a ^ b)     # A and b do not exist simultaneously in the meta Of

Immutable type is

Tuple (tuple)

1. List Contents

Constructs a tuple with 0 or 1 elements, which is more special

Tup1 = ()    # empty tuple tup2 = (20,) # An element that needs to be added with a comma after the element

The = = Tuple can also be spliced using the + operator. ==

The so-called "invariant" of a tuple is to say that each element of a tuple, pointing to never change

>>> t = (' A ', ' B ', [' A ', ' B ']) >>> t[2][0] = ' X ' >>> t[2][1] = ' Y ' >>> t (' A ', ' B ', [' X ', ' Y '])

= =Description of the variable of python = =

The declaration of a Python variable is a reference to an object that, for a mutable type, changes itself if his copy changes.

>>> a[1]>>> a=b=[]>>> a[]>>> b[]>>> b.append (0) >>> b[0]> >> a[0]>>>

For an immutable type, the value of the variable is not affected by the copy

>>> a=b= (1, 2, 3) >>> B (1, 2, 3) >>> + (4,) (1, 2, 3, 4) >>> B (1, 2, 3) >>> b=b+ (4,) >>> B (1, 2, 3, 4) >>> A (1, 2, 3)

Python Data type conversions

function	Description
int (x [, Base])	Convert x to an integer
Float (x)	Convert x to a floating-point number
Complex (real [, Imag])	Create a complex number
STR (x)	Convert an object x to a string
REPR (x)	Convert an object x to an expression string
eval (str)	Used to evaluate a valid Python expression in a string and return an object
Tuple (s)	Converting a sequence s to a tuple
List (s)	Convert the sequence s to a list
Set (s)	Convert to mutable Collection
Dict (d)	Create a dictionary. D must be a sequence (key,value) tuple.
Frozenset (s)	Convert to immutable Collection
Chr (x)	Converts an integer to one character
Ord (x)	Converts a character to its integer value
Hex (x)	Converts an integer to a hexadecimal string
Oct (x)	Converts an integer to an octal string

Related recommendations:

Basic data types for Python

Python common data types and common operations

Python basic data types detailed description