Fix Python subprocess.Popen Hangs

1 year ago
Benjamin Taylor
1 minute

When the subprocess.Popen method gets stuck while running a program, there are several possible reasons and solutions.

  1. send a message
process = subprocess.Popen(['command'], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
output, error = process.communicate()
  1. send a message
process = subprocess.Popen(['command'], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
output, error = process.communicate()

Alternatively, you can use the stdout.read() method to read the output of the child process. For example:

process = subprocess.Popen(['command'], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
output = process.stdout.read()
  1. send a message
process = subprocess.Popen(['command'], stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
output, error = process.communicate(input='input_data')
  1. pause
  2. Wait for the process to finish within the specified time limit.
process = subprocess.Popen(['command'], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
try:
    process.wait(timeout=10)
except subprocess.TimeoutExpired:
    process.kill()
    output, error = process.communicate()
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