How to run a specific line in python

Question

I was wondering how can I run only a small part of the code without running all the previous ones, such a thing would be very handy to me because I'm writing code just to see how it works and I do that in the same Python file, so when I want to run just the one I recently wrote it also runs all the previous ones.

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How do I run a specific line in Python?
How do I run a specific line in Pycharm?
How do you run a line by line in Python?
How do I run a single line in Python from terminal?

I only want to run the highlighted part, not all the previous lines:

Tomerikoo

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asked Apr 28, 2021 at 17:45

5

you should make all your codes inside functions. and call it inside the main function. for example:

# Import necessary libraries.

# Define your functions from the top
def Foo():
    print('foo')

def Bar():
    print('bar')

if __name__ == '__main__':
    # Run your code from here, call the needed functions.
    Foo()
    Bar()
    # If you don't want to run Bar(), simply comment it.

answered Apr 28, 2021 at 17:50

XiaXia

1591 gold badge2 silver badges8 bronze badges

0

Definitions/ Functions are the best way to go for this.

def afunc():
    print('This is the function printed after the other function')


def func():  # Starts the definition

    print('This is a function')
    

    afunc()

func() # Runs the Code

answered Apr 28, 2021 at 17:57

brrrrrrrtbrrrrrrrt

292 silver badges13 bronze badges

1

I've not used Pycharm specifically, but I know in many other IDEs for python (VS Code, Spyder, Jupyter), you can break out the script into cells and run each cell individually.

For VS Code and Spyder, you desginate different cells by including lines that start with #%%

This will also open up an interactive python shell where you can modify and re-run each section or type out individual lines to run

answered Apr 28, 2021 at 19:28

JimJim

3571 silver badge6 bronze badges

+4

Create a function, then you can "jump" to that code whenever you need to.

Felix

0

If you want to repeat the execution of a code, put it in a loop.

Gershon Fosu

0

def repeatFunction(): # here goes the part that you want to repeat. def main(): while(condition here): repeatFunction() main()

Benedek Máté Tóth

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Text files are composed of plain text content. Text files are also known as flat files or plain files. Python provides easy support to read and access the content within the file. Text files are first opened and then the content is accessed from it in the order of lines. By default, the line numbers begin with the 0th index. There are various ways to read specific lines from a text file in python, this article is aimed at discussing them.

File in use: test.txt

Method 1: fileobject.readlines()

A file object can be created in Python and then readlines() method can be invoked on this object to read lines into a stream. This method is preferred when a single line or a range of lines from a file needs to be accessed simultaneously. It can be easily used to print lines from any random starting index to some ending index. It initially reads the entire content of the file and keep a copy of it in memory. The lines at the specified indices are then accessed.

Example:

Python3

file = open('test.txt')

content = file.readlines()

print("tenth line")

print(content[9])

print("first three lines")

print(content[0:3])

Output

tenth line

This is line 10.
first three lines

This is line 1.This is line 2.This is line 3.

Method 2: linecache package

The linecache package can be imported in Python and then be used to extract and access specific lines in Python. The package can be used to read multiple lines simultaneously. It makes use of cache storage to perform optimization internally. This package opens the file on its own and gets to the particular line. This package has getline() method which is used for the same.

Syntax:

getLine(txt-file, line_number)

Example:

Python3

import linecache

particular_line = linecache.getline('test.txt', 4)

print(particular_line)

Output :

This is line 5.

Method 3: enumerate()

The enumerate() method is used to convert a string or a list object to a sequence of data indexed by numbers. It is then used in the listing of the data in combination with for loop. Lines at particular indexes can be accessed by specifying the index numbers required in an array.

Example:

Python3

file = open("test.txt")

specified_lines = [0, 7, 11]

for pos, l_num in enumerate(file):

if pos in specified_lines:

print(l_num)

Output

This is line 1.
This is line 8.
This is line 12.

How do I run a specific line in Python?

say I'm at the end of the script and want to JUMP to a specific line. Create a function, then you can "jump" to that code whenever you need to. If you want to repeat the execution of a code, put it in a loop.

How do I run a specific line in Pycharm?

With no selection, the command changes to Execute line in console. Choose this command from the context menu, or press Alt+Shift+E . The line at caret loads into the Python console, and runs.

How do you run a line by line in Python?

Interactive Mode: In Interactive Mode, you can run your script line by line in a sequence. To enter in an interactive mode, you will have to open Command Prompt on your windows machine and type ' python ' and press Enter .