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
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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:
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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.
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Open the file in read-only mode. In this case, we’re simply reading the contents of the file.
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Get all the lines of the file using the read(), splitlines() functions and store it in a variable.
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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.
Google Colab Images:
Files and Code: