Python cProfile With Arguments [With Example]

You can use the cProfile module to profile the performance of your code and gather information about how long different parts of your code take to execute. If you want to profile a Python script that accepts command-line arguments, you can do so by passing the script’s filename and the arguments to the cProfile module.

Here’s a step-by-step guide on how to use cProfile with a Python script that takes command-line arguments:

1. Create your Python script: Let’s assume you have a Python script named my_script.py that accepts command-line arguments. Here’s a simple example of such a script:

# my_script.py
import sys

def main(arg1, arg2):
    # Your code here
    print(f"Argument 1: {arg1}")
    print(f"Argument 2: {arg2}")

if __name__ == "__main__":
    if len(sys.argv) != 3:
        print("Usage: python my_script.py <arg1> <arg2>")
        sys.exit(1)

    arg1 = sys.argv[1]
    arg2 = sys.argv[2]

    main(arg1, arg2)</arg2></arg1>Code language: Python (python)

This script takes two command-line arguments and prints them.

2. Use cProfile to profile the script: You can use cProfile to profile the execution of my_script.py along with its command-line arguments. To do this, you’ll run your script using the cProfile module as follows:

python -m cProfile my_script.py arg1_value arg2_valueCode language: Python (python)

Replace arg1_value and arg2_value with the actual values you want to pass as command-line arguments. This command will execute your script and profile its performance.

3. View the profiling results: After running the cProfile command, you’ll see profiling results printed to the terminal. These results will include information about the time each function in your script takes to execute, the number of times each function is called, and more.

Here’s an example of what the profiling results might look like:

         6 function calls in 0.001 seconds

   Ordered by: standard name

   ncalls  tottime  percall  cumtime  percall filename:lineno(function)
        1    0.000    0.000    0.001    0.001 my_script.py:4(<module>)
        1    0.000    0.000    0.001    0.001 my_script.py:5(main)
        1    0.000    0.000    0.001    0.001 {built-in method builtins.exec}
        1    0.001    0.001    0.001    0.001 {built-in method builtins.print}
        2    0.000    0.000    0.000    0.000 {method 'split' of 'str' objects}
        1    0.000    0.000    0.000    0.000 {method 'write' of 'file' objects}

Argument 1: arg1_value
Argument 2: arg2_value
Code language: Python (python)

You can analyze these profiling results to identify bottlenecks or areas of your code that could be optimized for better performance.

Python cprofile with arguments for loop

If you want to profile a Python script that includes a for loop and accepts command-line arguments, you can follow a similar process as mentioned earlier. Here’s an example of how to do it:

1. Create your Python script with a for loop: In this example, let’s create a script called loop_profile.py that takes a command-line argument to determine the number of iterations in a simple for loop.

# loop_profile.py
import sys

def perform_iterations(num_iterations):
    for i in range(num_iterations):
        result = i * 2

def main():
    if len(sys.argv) != 2:
        print("Usage: python loop_profile.py <num_iterations>")
        sys.exit(1)

    num_iterations = int(sys.argv[1])
    perform_iterations(num_iterations)

if __name__ == "__main__":
    main()</num_iterations>Code language: Python (python)

This script accepts one command-line argument, num_iterations, which determines how many times the perform_iterations function will run a simple loop.

2. Use cProfile to profile the script: You can use cProfile to profile the execution of loop_profile.py along with its command-line argument:

python -m cProfile loop_profile.py 1000000Code language: Python (python)

In this example, we are running the script with 1,000,000 iterations. Adjust the argument as needed to test different numbers of iterations.

3. View the profiling results: After running the cProfile command, you’ll see profiling results printed to the terminal. These results will include information about the time spent in the perform_iterations function and any other functions called within it during the loop.

You can analyze these profiling results to gain insights into the performance of your loop and identify any bottlenecks or areas for optimization within your code.

By profiling your script with different values of num_iterations, you can assess the impact of loop size on performance and make informed decisions on how to optimize your code if necessary.

Python cprofile function with arguments

To profile a specific function with arguments using the cProfile module in Python, you can follow these steps:

1. Create your Python script containing the function you want to profile:

# my_script.py
import cProfile

def my_function(arg1, arg2):
    result = arg1 + arg2
    return result

if __name__ == "__main__":
    cProfile.run("my_function(10, 20)")Code language: Python (python)

In this example, we have a script with a function called my_function that takes two arguments arg1 and arg2.

2. Use cProfile to profile the specific function call with arguments:

In your terminal, run the script:

python my_script.pyCode language: Python (python)

This will execute the my_function with the provided arguments and profile its performance.

3. View the profiling results:

After running the script, you’ll see profiling results printed to the terminal, which will include information about the time spent in my_function and any other functions called within it. The output will provide details about the function’s execution time, the number of calls, and more.

Here’s an example of what the profiling results might look like:

         4 function calls in 0.000 seconds

   Ordered by: standard name

   ncalls  tottime  percall  cumtime  percall filename:lineno(function)
        1    0.000    0.000    0.000    0.000 my_script.py:4(my_function)
        1    0.000    0.000    0.000    0.000 {built-in method builtins.exec}
        1    0.000    0.000    0.000    0.000 {method 'disable' of '_lsprof.Profiler' objects}
        1    0.000    0.000    0.000    0.000 {method 'format' of 'str' objects}Code language: Python (python)

You can analyze these profiling results to understand the performance characteristics of my_function and identify any potential areas for optimization if needed.

Read More;

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