- 1 year ago
How to "replace" `os.execvpe` on Windows efficiently - if the "child" process is an interactive command line application?
On Windows, you can efficiently replace the os.execvpe
function with the subprocess
module to execute an interactive command line application. The subprocess
module provides more flexibility and features compared to os.execvpe
, allowing you to handle input and output streams effectively. Here's an example:
pythonimport subprocess
def run_command_interactively(command):
process = subprocess.Popen(command, shell=True, stdin=subprocess.PIPE, stdout=subprocess.PIPE,
stderr=subprocess.PIPE, universal_newlines=True)
# Optional: Send input to the child process
input_data = "Input to child process"
process.stdin.write(input_data)
process.stdin.flush() # Make sure the input is sent
# Read the output from the child process
output, error = process.communicate()
# Print the output and error
print("Output:\n", output)
print("Error:\n", error)
# Example usage
run_command_interactively("python -m my_module")
In this example, the subprocess.Popen
function is used to execute the interactive command line application specified by the command
parameter. The shell=True
parameter allows you to run the command in a shell environment.
You can send input to the child process using process.stdin.write()
and flush the input stream with process.stdin.flush()
. If you don't need to provide any input, you can skip this step.
The communicate()
method reads the output and error streams of the child process and returns them as strings. You can then process the output and error as needed.
Finally, the example prints the output and error for demonstration purposes, but you can handle them according to your requirements (e.g., write to a file, display in the UI, etc.).
Using the subprocess
module allows you to efficiently execute interactive command line applications on Windows while having control over input and output streams.