Python Program to Read a Random Line from a File

Files in Python:

One of the most important subjects for programmers and automation testers is Python file handling (also known as File I/O). It is necessary to work with files in order to write to or read data from them.

Also, if you didn’t know, I/O operations are the most expensive processes where a programme can go wrong. As a result, you must use extreme caution while implementing file processing for reporting or any other reason. Optimizing a single file action can help in the creation of a high-performing application or a reliable automated software testing solution.

Consider the following scenario: you’re planning to construct a large Python project with a large number of workflows. Then it’s unavoidable that you don’t make a log file. You’ll also be handling the log file’s read and write activities. Debugging huge applications with log files is a terrific way to go. It’s usually better to consider a scalable design from the start, as you won’t be sorry later if you didn’t.

Given a file, the task is to read a random line from the given File in Python

Program to Read a Random Line from a File in Python

Below is the full approach for reading a random line from the given File in Python

Approach:

Import random module using the import keyword
Make a single variable to store the path of the file. This is a constant value. This value must be replaced with the file path from your own system in the example below.
Open the file in read-only mode. In this case, we’re simply reading the contents of the file.
Get all the lines of the file using the read(), splitlines() functions and store it in a variable.
Print a random line from the given file using the random.choice() function by passing the above lines as an argument to it.
The Exit of Program.

Below is the implementation:

# Import random module using the import keyword
import random
# Make a single variable to store the path of the file. This is a constant value.
# This value must be replaced with the file path from your own system in the example below.
givenFilename = "samplefile.txt"
# Open the file in read-only mode. In this case, we're simply reading the contents of the file.
with open(givenFilename, 'r') as givenfilecontent:
    # Get all the lines of the file using the read(), splitlines() functions and 
    # Store it in a variable
    file_lines = givenfilecontent.read().splitlines()
    # Print a random line from the given file using the random.choice() function
    # by passing the above lines as an argument to it
    print(random.choice(file_lines))

Output:

btechgeeks

File Content:

hello
thisis 
btechgeeks
welcomeall

Explanation:

The file path is stored in the variable ‘file name.’ Change the value of this variable to the path of your own file.
Dragging and dropping a file onto the terminal will show its path. The code will not run unless you change the value of this variable.
The file will be opened in reading mode. Use the open() function to open a file. The path to the file is the method’s first parameter, and the mode to open the file is the method’s second parameter.
When we open the file, we use the character ‘r’ to signify read-mode.
We use random.choice() method to select random line from list of lines.

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Files and Code:

Program to Read a Random Line from a File in Python

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