Как очистить консоль в python windows

This function works in gnome-terminal because, by default, it recognizes ANSI escape sequences. It gives you a CLEAN PROMPT rows_max distance from the bottom of the terminal, but also precisely from where it was called. Gives you complete control over how much to clear.

def clear(rows=-1, rows_max=None, *, calling_line=True, absolute=None,
          store_max=[]):
    """clear(rows=-1, rows_max=None)
clear(0, -1) # Restore auto-determining rows_max
clear(calling_line=False) # Don't clear calling line
clear(absolute=5) # Absolutely clear out to 5 rows up"""
    from os import linesep
    if rows_max and rows_max != -1:
        store_max[:] = [rows_max, False]
    elif not store_max or store_max[1] or rows_max == -1 or absolute:
        try:
            from shutil import get_terminal_size
            columns_max, rows_max = get_terminal_size()
        except ImportError:
            columns_max, rows_max = 80, 24
        if absolute is None:
            store_max[:] = [rows_max, True]
    if store_max:
        if rows == -1:
            rows = store_max[0]
        elif isinstance(rows, float):
            rows = round(store_max[0] * rows)
        if rows > store_max[0] - 2:
            rows = store_max[0] - 2
    if absolute is None:
        s = ('33[1A' + ' ' * 30 if calling_line else '') + linesep * rows
    else:
        s = '33[{}A'.format(absolute + 2) + linesep
        if absolute > rows_max - 2:
            absolute = rows_max - 2
        s += (' ' * columns_max + linesep) * absolute + ' ' * columns_max
        rows = absolute
    print(s + '33[{}A'.format(rows + 1))

Implementation:

clear() # Clear all, TRIES to automatically get terminal height
clear(800, 24) # Clear all, set 24 as terminal (max) height
clear(12) # Clear half of terminal below if 24 is its height
clear(1000) # Clear to terminal height - 2 (24 - 2)
clear(0.5) # float factor 0.0 - 1.0 of terminal height (0.5 * 24 = 12)
clear() # Clear to rows_max - 2 of user given rows_max (24 - 2)
clear(0, 14) # Clear line, reset rows_max to half of 24 (14-2)
clear(0) # Just clear the line
clear(0, -1) # Clear line, restore auto-determining rows_max
clear(calling_line=False) # Clear all, don't clear calling line
clear(absolute=5) # Absolutely clear out to 5 rows up

Parameters: rows is the number of clear text rows to add between prompt and bottom of terminal, pushing everything up. rows_max is the height of the terminal (or max clearing height) in text rows, and only needs to be set once, but can be reset at any time. *, in the third parameter position means all following parameters are keyword only (e.g., clear(absolute=5)). calling_line=True (default) works better in Interactive mode. calling_line=False works better for text-based, terminal applications. absolute was added to try to fix glitchy gap problems in Interactive mode after reducing size of terminal, but can also be used for terminal applications. store_max is just for secret, «persistent» storage of rows_max value; don’t explicitly use this parameter. (When an argument is not passed for store_max, changing the list contents of store_max changes this parameter’s default value. Hence, persistent storage.)

Portability: Sorry, this doesn’t work in IDLE, but it works >> VERY COOL << in Interactive mode in a terminal (console) that recognizes ANSI escape sequences. I only tested this in Ubuntu 13.10 using Python 3.3 in gnome-terminal. So I can only assume portability is dependant upon Python 3.3 (for the shutil.get_terminal_size() function for BEST results) and ANSI recognition. The print(...) function is Python 3. I also tested this with a simple, text-based, terminal Tic Tac Toe game (application).

For use in Interactive mode: First copy and paste the copy(...) function in Interactive mode and see if it works for you. If so, then put the above function into a file named clear.py . In the terminal start python, with ‘python3’. Enter:

>>> import sys
>>> sys.path
['', '/usr/lib/python3.3', ...

Now drop the clear.py file into one of the path directories listed so that Python can find it (don’t overwrite any existing files). To easily use from now on:

>>> from clear import clear
>>> clear()
>>> print(clear.__doc__)
clear(rows=-1, rows_max=None)
clear(0, -1) # Restore auto-determining rows_max
clear(calling_line=False) # Don't clear calling line
clear(absolute=5) # Absolutely clear out to 5 rows up

For use in a terminal application: Put the copy(...) function into a file named clear.py in the same folder with your main.py file. Here is a working abstract (skeleton) example from a Tic Tac Toe game application (run from terminal prompt: python3 tictactoe.py):

from os import linesep

class TicTacToe:    
    def __init__(self):
        # Clear screen, but not calling line
        try:
            from clear import clear
            self.clear = clear
            self.clear(calling_line=False)
        except ImportError:
            self.clear = False
        self.rows = 0    # Track printed lines to clear

        # ...
        self.moves = [' '] * 9

    def do_print(self, *text, end=linesep):
        text = list(text)
        for i, v in enumerate(text[:]):
            text[i] = str(v)
        text = ' '.join(text)
        print(text, end=end)
        self.rows += text.count(linesep) + 1

    def show_board(self):
        if self.clear and self.rows:
            self.clear(absolute=self.rows)
        self.rows = 0
        self.do_print('Tic Tac Toe')
        self.do_print('''   |   |
 {6} | {7} | {8}
   |   |
-----------
   |   |
 {3} | {4} | {5}
   |   |
-----------
   |   |
 {0} | {1} | {2}
   |   |'''.format(*self.moves))

    def start(self):
        self.show_board()
        ok = input("Press <Enter> to continue...")
        self.moves = ['O', 'X'] * 4 + ['O']
        self.show_board()
        ok = input("Press <Enter> to close.")

if __name__ == "__main__":
    TicTacToe().start()

Explanation: do_print(...) on line 19 is a version of print(...) needed to keep track of how many new lines have been printed (self.rows). Otherwise, you would have to self.rows += 1 all over the place where print(...) is called throughout the entire program. So each time the board is redrawn by calling show_board() the previous board is cleared out and the new board is printed exactly where it should be. Notice self.clear(calling_line=False) on line 9 basically pushes everything up RELATIVE to the bottom of the terminal, but does not clear the original calling line. In contrast, self.clear(absolute=self.rows) on line 29 absolutely clears out everything self.rows distance upward, rather than just pushing everything upward relative to the bottom of the terminal.

Ubuntu users with Python 3.3: Put #!/usr/bin/env python3 on the very first line of the tictactoe.py file. Right click on the tictactoe.py file => Properties => Permissions tab => Check Execute: Allow executing file as program. Double click on the file => Click Run in Terminal button. If an open terminal’s current directory is that of the tictactoe.py file, you can also start the file with ./tictactoe.py.

This function works in gnome-terminal because, by default, it recognizes ANSI escape sequences. It gives you a CLEAN PROMPT rows_max distance from the bottom of the terminal, but also precisely from where it was called. Gives you complete control over how much to clear.

def clear(rows=-1, rows_max=None, *, calling_line=True, absolute=None,
          store_max=[]):
    """clear(rows=-1, rows_max=None)
clear(0, -1) # Restore auto-determining rows_max
clear(calling_line=False) # Don't clear calling line
clear(absolute=5) # Absolutely clear out to 5 rows up"""
    from os import linesep
    if rows_max and rows_max != -1:
        store_max[:] = [rows_max, False]
    elif not store_max or store_max[1] or rows_max == -1 or absolute:
        try:
            from shutil import get_terminal_size
            columns_max, rows_max = get_terminal_size()
        except ImportError:
            columns_max, rows_max = 80, 24
        if absolute is None:
            store_max[:] = [rows_max, True]
    if store_max:
        if rows == -1:
            rows = store_max[0]
        elif isinstance(rows, float):
            rows = round(store_max[0] * rows)
        if rows > store_max[0] - 2:
            rows = store_max[0] - 2
    if absolute is None:
        s = ('33[1A' + ' ' * 30 if calling_line else '') + linesep * rows
    else:
        s = '33[{}A'.format(absolute + 2) + linesep
        if absolute > rows_max - 2:
            absolute = rows_max - 2
        s += (' ' * columns_max + linesep) * absolute + ' ' * columns_max
        rows = absolute
    print(s + '33[{}A'.format(rows + 1))

Implementation:

clear() # Clear all, TRIES to automatically get terminal height
clear(800, 24) # Clear all, set 24 as terminal (max) height
clear(12) # Clear half of terminal below if 24 is its height
clear(1000) # Clear to terminal height - 2 (24 - 2)
clear(0.5) # float factor 0.0 - 1.0 of terminal height (0.5 * 24 = 12)
clear() # Clear to rows_max - 2 of user given rows_max (24 - 2)
clear(0, 14) # Clear line, reset rows_max to half of 24 (14-2)
clear(0) # Just clear the line
clear(0, -1) # Clear line, restore auto-determining rows_max
clear(calling_line=False) # Clear all, don't clear calling line
clear(absolute=5) # Absolutely clear out to 5 rows up

Parameters: rows is the number of clear text rows to add between prompt and bottom of terminal, pushing everything up. rows_max is the height of the terminal (or max clearing height) in text rows, and only needs to be set once, but can be reset at any time. *, in the third parameter position means all following parameters are keyword only (e.g., clear(absolute=5)). calling_line=True (default) works better in Interactive mode. calling_line=False works better for text-based, terminal applications. absolute was added to try to fix glitchy gap problems in Interactive mode after reducing size of terminal, but can also be used for terminal applications. store_max is just for secret, «persistent» storage of rows_max value; don’t explicitly use this parameter. (When an argument is not passed for store_max, changing the list contents of store_max changes this parameter’s default value. Hence, persistent storage.)

Portability: Sorry, this doesn’t work in IDLE, but it works >> VERY COOL << in Interactive mode in a terminal (console) that recognizes ANSI escape sequences. I only tested this in Ubuntu 13.10 using Python 3.3 in gnome-terminal. So I can only assume portability is dependant upon Python 3.3 (for the shutil.get_terminal_size() function for BEST results) and ANSI recognition. The print(...) function is Python 3. I also tested this with a simple, text-based, terminal Tic Tac Toe game (application).

For use in Interactive mode: First copy and paste the copy(...) function in Interactive mode and see if it works for you. If so, then put the above function into a file named clear.py . In the terminal start python, with ‘python3’. Enter:

>>> import sys
>>> sys.path
['', '/usr/lib/python3.3', ...

Now drop the clear.py file into one of the path directories listed so that Python can find it (don’t overwrite any existing files). To easily use from now on:

>>> from clear import clear
>>> clear()
>>> print(clear.__doc__)
clear(rows=-1, rows_max=None)
clear(0, -1) # Restore auto-determining rows_max
clear(calling_line=False) # Don't clear calling line
clear(absolute=5) # Absolutely clear out to 5 rows up

For use in a terminal application: Put the copy(...) function into a file named clear.py in the same folder with your main.py file. Here is a working abstract (skeleton) example from a Tic Tac Toe game application (run from terminal prompt: python3 tictactoe.py):

from os import linesep

class TicTacToe:    
    def __init__(self):
        # Clear screen, but not calling line
        try:
            from clear import clear
            self.clear = clear
            self.clear(calling_line=False)
        except ImportError:
            self.clear = False
        self.rows = 0    # Track printed lines to clear

        # ...
        self.moves = [' '] * 9

    def do_print(self, *text, end=linesep):
        text = list(text)
        for i, v in enumerate(text[:]):
            text[i] = str(v)
        text = ' '.join(text)
        print(text, end=end)
        self.rows += text.count(linesep) + 1

    def show_board(self):
        if self.clear and self.rows:
            self.clear(absolute=self.rows)
        self.rows = 0
        self.do_print('Tic Tac Toe')
        self.do_print('''   |   |
 {6} | {7} | {8}
   |   |
-----------
   |   |
 {3} | {4} | {5}
   |   |
-----------
   |   |
 {0} | {1} | {2}
   |   |'''.format(*self.moves))

    def start(self):
        self.show_board()
        ok = input("Press <Enter> to continue...")
        self.moves = ['O', 'X'] * 4 + ['O']
        self.show_board()
        ok = input("Press <Enter> to close.")

if __name__ == "__main__":
    TicTacToe().start()

Explanation: do_print(...) on line 19 is a version of print(...) needed to keep track of how many new lines have been printed (self.rows). Otherwise, you would have to self.rows += 1 all over the place where print(...) is called throughout the entire program. So each time the board is redrawn by calling show_board() the previous board is cleared out and the new board is printed exactly where it should be. Notice self.clear(calling_line=False) on line 9 basically pushes everything up RELATIVE to the bottom of the terminal, but does not clear the original calling line. In contrast, self.clear(absolute=self.rows) on line 29 absolutely clears out everything self.rows distance upward, rather than just pushing everything upward relative to the bottom of the terminal.

Ubuntu users with Python 3.3: Put #!/usr/bin/env python3 on the very first line of the tictactoe.py file. Right click on the tictactoe.py file => Properties => Permissions tab => Check Execute: Allow executing file as program. Double click on the file => Click Run in Terminal button. If an open terminal’s current directory is that of the tictactoe.py file, you can also start the file with ./tictactoe.py.

Иногда, работая с оболочкой Python, мы получали случайный вывод или писали ненужные операторы, и мы хотим очистить экран по какой-то причине.

Как очистить экран оболочки в Python? Для очистки терминала (окна терминала) используются команды «cls» и «clear». Если вы используете оболочку в IDLE, на нее такие команды не повлияют. К сожалению, в IDLE нет возможности очистить экран. Лучшее, что вы могли сделать, – это прокрутить экран вниз на множество строк.

Например –

 
print("/n" * 100) 

Хотя вы можете поместить это в функцию:

 
def cls(): 
         print("/n" * 100) 

А затем при необходимости вызовите его как функцию cls(). Это очистит консоль; все предыдущие команды исчезнут, и экран начнется с самого начала.

Если вы используете Linux, то –

 
Import os 
# Type 
os.system('clear') 

Если вы используете Windows-

 
Import os 
#Type 
os.system('CLS') 

Мы также можем сделать это с помощью скрипта Python. Рассмотрим следующий пример.

Пример –

 
# import os module  
from os import system, name  
 
# sleep module to display output for some time period  
from time import sleep  
 
# define the clear function  
def clear():  
 
 # for windows  
 if name == 'nt':  
 _ = system('cls')  
 
 # for mac and linux(here, os.name is 'posix')  
 else:  
 _ = system('clear')  
 
# print out some text  
print('Hellon'*10)  
 
# sleep time 2 seconds after printing output  
sleep(5)  
 
# now call function we defined above  
clear()  

Примечание. Используется переменная подчеркивания, потому что оболочка Python всегда сохраняет свой последний вывод в подчеркивании.

While working on the Python terminal (not a console)/interactive shell, some errors occur in the output. So, we have to clean the screen by pressing Control (Ctrl) and L keys simultaneously.   

However, sometimes there are situations when the output has to be formatted properly to eliminate issues.

That’s why clearing the screen is based on the amount of output. In this situation, some commands need to be inserted in Python’s script to clear the screen as and when required.

So in this article, we will consider every possible way to clear the screen in Python without having any trouble or errors.

How to Clear Screen in Python Terminal

If you are working on a terminal, then use commands «cls» and «clear» to clear the terminal like this:

For Windows Users

If you are a Windows user and want to clear the screen in Python, you can easily do it using the "cls" command.

>cls 

This command will instantly clear the screen, as you can see in the below image:

For Linux Users

Linux also has a command to clear screen in Python easily, so use the following command to do it:

$ clear

Remember there is no specific function, built-in keywords, etc., available to clear the screen. That’s why users need to clear the screen according to them.

Clear Screen in Python Using Functions

Now let’s consider the functions we can use for clearing the screen in Python and remember that you can use these functions in both Windows and Linux.

Using click library

In this method, you can use click library to create a function, and it can work on both Windows and Linux.

Code:

# Python program to clear screen using click.clear() function

# Import click library
import click

def clrscr():
   # Clear screen using click.clear() function
    click.clear()
    
   print("Screen Cleared")
clrscr()

Output:

Screen Cleared

Code Explanation:

In the above example, we are using click.clear() function from click library to clear screen.

This function works in Windows, Linux, and Mac operating systems.

Using n (Newline character)

The whole way of not clearing the screen is as different as the answer is different. To remove any further error of the line, the user does not need to run the external process completely so that the screen can be cleared.

To clear the screen, you have to print new numbers which are higher than the height and can print something like this (» n» * 10)

Code:

# Python program to clear the screen using n
# ‘n’ is a newline character

def clrscr():
   # Print ‘n’ 10 times
    print ("n" * 10)
    
print("Screen Cleared")
clrscr()

Output:

Screen Cleared

Code Explanation:

In the above example, we need to clear a few lined of the screen so we use “n” with print, this will add a newline character and clear x number of lines.

Clear screen program by using os.system method

There are many OS platforms like Windows, Linux, and macOS, so we need different commands to clear the screen. So as you can see in the below syntax, we have used the ‘_’ variable for holding the value of the last expression in the interpreter.

Now we will describe the os.system method to clear the screen in Python without having any troubles. As you can see in the below syntax, we have used the os.system command because It is a string that tells which command needs to be executed.

Code:

# Python program to clear the screen using os.system

# Import os module
import os

def clrscr():
    # Check if Operating System is Mac and Linux or Windows
   if os.name == 'posix':
      _ = os.system('clear')
   else:
      # Else Operating System is Windows (os.name = nt)
      _ = os.system('cls')
    
   print("Screen Cleared")
clrscr()

Output

Screen Cleared

Code Explanation:

We got «Screen Cleared» as we have printed it using the above syntax in the output.

In the above example first, we are checking if the operating system is Linux or not by checking the value of os.name method.
If the Operating system is Linux or Mac the value of os.name will be ”posix”.

And if the value of os.name is posix then we will run the function os.system('clear') or else we will run function os.system('cls').

Example 2

# Python program to clear screen
# This function is applicable for all operating system like Windows, Linux, and OS-X

# Import Library platform and os
import platform   
import os         


def clr_scr():  
    # Check if the platform is Windows or linux
# If Platform is Windows then run command os.system(‘cls’) else os.system(‘clear’)
    if(platform.system().lower()=="windows"):
        cmdtorun='cls'
    else:
        cmdtorun='clear'   
    
    os.system(cmdtorun)
clr_scr()

Code Explanation:

In the above example first, we check if the platform is Windows or Linux by using platform.system() function.

If the platform is “Windows” then we store the value of a command in the variable “cmdtorun”.

And at the end of the function, we are run the function os.system(cmdtorun) with the variable “cmdtorun”.

Using Subprocess Library

In this example, we have used the subprocess() function to execute an action for clearing the screen in output.

Input:

# Python program to clear the screen using subprocess.call() function

# Import subprocess library
import subprocess

def clrscr():
    cls = subprocess.call('cls',shell=True)
    print("Screen Cleared")
clrscr()

Output:

Screen Cleared

Conclusion

So this is how you can easily clear the screen in Python using functions or commands in the Syntax. As we have mentioned earlier,

There are many methods to clear the screen in Python without getting any errors. But, in our opinion, a clear screen using a click library is the easiest because it works with both the operating systems Unix, Windows, and macOS. And it doesn’t need checking the OS.

Do you use the Python interpreter console for practicing Python code?

You might have seen, there is no direct way or command to clear Python interpreter console.

No worries. There is indirect way of doing this. Let’s see.

You can clear the Python interpreter console screen using a system call.

System calls to clear the console:

• For the window system, cls clear the console.
• For the Linux system, clear command works.

We can run these system calls through the Python to clear screen. It’s simple.

To call the system calls through the Python console, we need the os library to be imported. This os library comes inbuilt with python installation. There is no need to explicitly install it.

Watch this video where I have demonstrated how you can clear the Python shell interpreter console.

Command to clear Python Interpreter Console on Window

Using Python Definition:

import os
def clear(): os.system('cls') #on Windows System
clear()

If you know the basic Python syntax, this code is self explanatory.

Using Lambda Function:

import os
clear = lambda: os.system('cls') #on Windows System
clear()

Command to clear Python Interpreter Console on Linux:

Using Python Definition:

import os
def clear(): os.system('clear') #on Linux System
clear()

Using Lambda Function:

import os
clear = lambda: os.system('clear') #on Linux System
clear()

Don’t Just Copy Paste the Code:

Why am I saying that?

If you copy-paste the code, I am pretty sure you will forget this code and then tomorrow again you will do a Google Search.

The best way is to understand the code written above. It is pretty simple to remember and write code if you know how it has implemented.

What is Lambda Function here?

Above code is all about lambda function.

The “lambda” keyword in Python is used to define anonymous functions. And these functions are also called as lambda functions.

Learn more about lambda function. You can write many such codes with no more hustle. It is extremely useful.

These commands are tested on Python 3.4 version. It will work for both Python 2.x and 3.x versions.

What’s Next?

You can run a Python program without using the Python interpreter console. Install free text editor for your system (Linux/Windows/Mac). And now you can run the Python program from Windows’s command prompt or Linux’s terminal.

I am a Python developer.  I usually keep Python interpreter console opened. Sometimes test command runs over it and creates cluttered print output on python console. These backlog print command needs to be cleared. So use this trick to clear screen in Python.

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Hope you find this quick commands and guide useful for your Python learning. Is there anything I can help you with? Feel free to write in the comment section below.

Happy Pythoning!