In Python, you can use the print() function to print out color information. Before using print() to print, you need to call the os standard library to set up the system.
1 os standard library
1.1 Introduction
os is the abbreviation of Operating System, that is, "operating system". The os standard library is an operating system interface module that provides functions for using operating system-related functions.
1.2 Import of os standard library
The library needs to be imported through import, and the code is as follows:
import os1.3 Judgment of operating system type
The type of the operating system can be judged by os.name, where posix indicates that the operating system is Linux; nt indicates that the operating system is Windows; java indicates that the operating system is a java virtual machine. So the code for operating system type judgment is as follows:
if os.name == 'nt':
os.system('')1.4 Creation of child processes
When the current operating system is determined to be Windows by os.name, a new subprocess needs to be created to display color information, and the task of creating a subprocess is completed by os.system(). The os.system() function can create a subprocess and convert the string into a command to run in this subprocess. If the parameter of this function is empty, it means that only the subprocess is created without executing the command.
2 print() function to print color information
When a child process is created through the os annotation library, the color information can be printed through the print() function.
2.1 Format for printing color information
The format for printing color information using print is as follows:
\033[显示方式;前景色;背景色m 显示内容 \033[0mAmong them, \033 is an escape sequence, the value is an octal number, converted to decimal is 27, which is the ASCII code value of ESC.
2.2 Print a single line of color information
Use the following code to print a single line of color information:
print('\033[1;37;41m--------我是彩色信息--------\033[0m')Among them, the number 1 behind the square brackets is the display mode, which means highlighting; 37 is the foreground color, which means white; 41 is the background color, which means red.
Related link 1 Display mode value and description
| Display method |
illustrate |
Display method |
illustrate |
| 0 |
Terminal default settings |
1 |
Highlight |
| 4 |
use underscore |
5 |
flashing |
| 7 |
Highlight |
8 |
Invisible |
Related link 2 Corresponding value of foreground color and background color
| color |
foreground color |
background color |
color |
foreground color |
background color |
| black |
30 |
40 |
red |
31 |
41 |
| green |
32 |
42 |
yellow |
33 |
43 |
| blue |
34 |
44 |
Fuchsia |
35 |
45 |
| cyan |
36 |
46 |
White |
37 |
47 |
2.3 Running the program
The program cannot display the effect of color information in IDLE, and needs to be run in the cmd window. After opening the cmd window, drag the program file into the cmd window, and the absolute path of the Python file will be automatically displayed in the cmd command line, as shown in Figure 1①. After clicking Enter, the color single-line information will be displayed, as shown in Figure 1②.
Figure 1 shows a single line of color information
2.4 Print multi-line color information
Use the following code to print multiple lines of color information.
print('\033[1;37;41m')
print('--------我是彩色信息1--------')
print('--------我是彩色信息2--------')
print('--------我是彩色信息3--------')
print('\033[0m')Among them, the first line is the start mark for printing color information, and the last line is the end mark. The effect after running the file is shown in Figure 2.
Figure 2 Printing multiple lines of color information