How to clear python shell

Python Clear Screen

When programming in Python using the interactive shell, you can see the output after running every script. This can make the screen a bit clumsy and you might have problems locating a particular output. In that case, you might want to clear the screen.

You might want to clear the screen while executing a python script. Unfortunately, there’s no built-in keyword or function/method to do so. So, you have to do it on your own.

How to clear the shell screen in Python?

We will look here following ways to clear the Python output screen in this article:

1) Using ANSI Escape

You can use ANSI escape sequences. But these are not portable and may not produce the output you are looking for.

The most common ways to clear an interactive shell screen on Windows and Linux platforms are given below –

For Windows terminals:

For Linux / OS X platforms:

If you want to clear a screen on other programming environments other than Python, such as Bash, MySQL or MATLAB, just press CTRL + L.

2) Using the Subprocess Module

You can use the subprocess module in Python to clear the output screen.

Windows:

import subprocess as sp sp.call('cls',shell=True)

The second line of the code must be replaced with tmp = sp.call(‘cls’,shell=True), to prevent 0 from popping up at the top of the output screen.

Linux:

import subprocess as sp sp.call('clear',shell=True)

Replace the second line of the code with tmp = sp.call(‘clear’,shell=True) for the reason mentioned earlier.

3) Using the OS Module

Use the import statement to load the os library. Then use the system method and pass ‘cls’ as the parameter to clear the output screen.

Windows:

Linux/ OS X:

4) Using Click Module

The click module works on Windows, Linux and OS X platforms.

Windows:

5) Custom Program to Clear Screen

You can write a Python program to clear the screen –

# The code works on all platforms such as Windows, Linux and OS-X import platform # For obtaining the operating system information import os # Import the os module to clear screen def clr_scr(): #Python program to clear screen #Get command to execute if(platform.system().lower()=="windows"): cmd='cls' else: cmd='clear' # Run command os.system(cmd) # Call function to clear screen clr_scr()

6) Using Clear-Screen Class

from clear_screen import clear # Python program to clear screen # Using clear Module # Import clear_screen Class from clear Module from clear_screen import clear # execute function clear() clear()

Conclusion

As discussed above, there are multiple ways through which you can clear the screen in Python. It also depends on the module you have installed.

If you are running Python scripts on multiple platforms, then you can use the clear command, click module or can just create your own program to clear the interactive shell screen. Make sure you have properly loaded modules using the import statement before using them.

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How to Clear Python Shell in the Most Effective Way

We all must have experienced one common thing while working in any programming language which is messy code and output. It rarely happens that we get the desired output in one go, so there are many hits and trials before that. But it is difficult to work on messy code and outputs so, we need a clear screen. If you have ever worked on c++ the function that helps us to achieve this goal is clrscr().

If we are working on an interactive shell, we can quickly clear the output by simply pressing ‘Ctrl + L.’ But when we are working on IDLE, command prompt, Linux Terminal in a running shell, we need to make our own functions to do so. So, let’s learn how to clear a python shell.

How to Clear Python Shell?

If we are working in a REPL terminal, to clear the output, we can make a function using the os module. An os module helps us to interact with our systems. A REPL terminal also known as read–eval–print loop terminal can be windows command prompt, your Linux terminal, or anaconda prompt. So, let us learn how to make a function to clear the python shell.

How to Clear Python Shell in Windows Command Prompt or Anaconda Prompt?

To clear screen in these terminals, we have first to import the os module using the code – import os.

import os def clear_screen(): os.system('cls') for i in range(10): print(i) clear_screen()

import os def clear_screen(): os.system('clear') for i in range(10): print(i) clear_screen()

Note- I am using RedHat version-8. The procedure of starting a python shell inside your terminal may vary from mine.

How to clear Shell in IDLE?

IDLE or (Integrated Development and Learning Environment) is an interactive shell where we can code or write programs in python. There is no such built-in function or way to clear the python shell, but we have a trick by which we achieve our goal.

We cannot use the functions that we used to clear the screen in the windows command prompt in IDLE.

Let’s see how we can do this –

def clear(): print("\n"*47) for i in range(20): print(i) clear()

In the video above, we can clearly see that our function is just moving the prompt 47 lines down and if we scroll up, we can see the previously written code.

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Conclusion

We have learned how to clear python shell in the most effective way and most of the operating systems. We have also learned the trick to clear the screen when we do not have any built-in function for it.

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Как очистить консоль в Python

В данном руководстве рассмотрим различные способы очистки консоли в Python.

Способ 1: использование модуля os

Используйте команду os.system(‘clear’) для очистки консоли на Mac и Linux в Python и команду os.system(‘cls’) для очистки консоли на платформе Windows. Для программной очистки консоли в Python необходимо импортировать модуль os и использовать его метод os.system(). os — это встроенная библиотека, которая поставляется вместе с установкой Python3.

Я использую Mac, поэтому мне нужно писать команды, связанные с Linux.

Если вы запустите приведенную выше команду в своей консоли, она очистит экран.

Для пользователя Windows используйте следующий код.

Вы можете использовать лямбда-функцию, если не хотите использовать полную.

Способ 2: с помощью функции subprocess.call()

Вы можете использовать функцию subprocess.call() в модуле подпроцесса, которая позволяет создавать новые процессы, подключаться к их каналам ввода/вывода/ошибки и очищать консоль в Python.

Если вы запустите приведенный выше код, он очистит консоль.

Способ 3: использование escape-кодов ANSI

Escape-коды ANSI — это последовательности символов, которые можно включить в строку, чтобы указать различные типы форматирования вывода терминала, например, изменить цвет или положение курсора или очистить консоль.

Код очистит консоль Python.

«\033» — управляющий символ, а c — код для сброса терминала.

Аргумент «end» устанавливается в пустую строку, чтобы гарантировать, что после escape-кода не будет добавлен дополнительный разрыв строки.

Способ 4: применение пакета ipykernel в блокнотах Jupyter

В блокнотах Jupyter вы можете очистить вывод ячейки с помощью пакета ipykernel.

Пакет ipykernel предоставляет API для управления ядром Jupyter, включая возможность очистки вывода ячейки или, в нашем случае, программной консоли.

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How to Clear Screen in Python?

Python os module is imported to clear the console screen in any operating system. The system() method of the os module with the string cls or clear as a parameter is used to clear the screen in windows and macOS/Linux, respectively.

Introduction to Python Clear Screen

Suppose there is a case where you have given the information of 3 students, and you have to print their details in a way like first there will be information of student 1 , then after some time information of student 2 will be displayed and then finally the information of student 3 will be displayed. So, in that case, we will have to clear the python console each time after displaying information about each student.

Image Explanation of the above Example

In an interactive shell/terminal , to clear the python console, we can use the ctrl+l command, but in most cases, we have to clear the screen while running the python script, so we have to do it programmatically.

We can clear screen programmatically, and it helps us to format the output in the way we want. We can also clear the output whenever we want many numbers of times.

How to clear the python console screen?

Clearing the console in python has different methods for different Operating Systems. These are stated below:

• In Windows: For clearing the console in the windows operating system, we will use the system() function from the os module with the ‘cls’ parameter.

Syntax of the system() function: system() function is in the os module, so the os module needs to be imported before using the system() function in Windows. After importing the os module, the string parameter ‘cls’ is passed inside the system function to clear the screen.

• In Linux and MacOS: For clearing the console in Linux and Mac operating systems, we will use the system() function from the os module with the ‘clear’ parameter.

Syntax: os module needs to be imported before using the system() function in Linux. After importing the os module string value parameter ‘clear’ is passed inside the system function to clear the screen.

• Ctrl+l: This method only works for Linux operating system. In an interactive shell/terminal, we can simply use ctrl+l to clear the screen.

Example of Python Clear Screen

Example 1: Clearing Screen in Windows Operating System

Let’s look at an example of the clear screen in python to clarify our understanding.

We will use the above-stated system() function for clearing the python console.

First, we will print some Output; then we will wait for 4 seconds using the sleep() function to halt the program for 4 seconds, and after that, we will apply os.system(‘cls’) to clear the screen.

The output window will print the given text first, then the program will sleep for 4 seconds, then the screen will be cleared, and program execution will be stopped.

Example 2: Clearing the screen, then printing some more information in Windows Operating System.

First we will print some Output, then we will wait for 1 second using the sleep() function, and after that, we will apply os.system(‘cls’) to clear the screen.

After that, we will print some more information.

The output window will print the first information, then the program will sleep for 1 second, and the screen will be cleared, and then it will print the second information. Again the program will sleep for 1 second, and at last, the program will be stopped after printing the final batch of information.

Example 3: Clearing Screen in Linux Operating System

We will use the above-stated system() method for clearing the python console.

First, we will print some Output; then we will wait for 5 seconds using the sleep() function, and after that, we will apply os.system(‘clear’) to clear the screen.

The output window will print the given text first, then the program will sleep for 5 seconds, then the screen will be cleared, and program execution will be stopped.

Example 4: What if we don’t know what OS we are working on?

There can be a case where we must first determine what OS we are working on. So, we will first determine whether the os is Windows, Linux, or Mac.

For Windows, the os name is «nt» and for Linux or mac, the OS name is «posix».

So we will check the os name and then accordingly apply the function.

For this case, the os name is nt , so windows console will be cleared after 2 seconds of program sleep, and then it will be terminated.

Conclusion

Now that we have seen various examples of how to clear the screen in python let us note down a few points.

• Clearing Screen can be done programmatically, and also it helps us to format the output the way we want.
• For clearing the console in the windows operating system, we will use the system() method from the os module with the ‘cls’ parameter.
• For clearing the console in Linux operating system, we will use the system() method from the os module with the ‘clear’ parameter.
• For windows, the os name is nt , and for Linux, it is posix , so we can also first determine the os and then clear the screen.

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