Subprocess

snippets.py

# Import whole module
import subprocess

# Import selected calls from module
from subprocess import Popen, PIPE
 
process = Popen(['cat', 'test.py'], stdout=PIPE, stderr=PIPE)
stdout, stderr = process.communicate()
print(stdout)

# Run the command described by args. 
# Wait for command to complete, then return the returncode attribute.
subprocess.call(args, *, stdin=None, stdout=None, stderr=None, shell=False)

#Example:
import subprocess
subprocess.call(["ls", "-l"]) # Same as ls -l in shell


# Run command with arguments and return its output as a byte string.
# Save process output (stdout)
subprocess.check_output(args, *, stdin=None, stderr=None, shell=False, universal_newlines=False)

#Example:
output_string = subprocess.check_output(["echo", "Hello World!"])
print("Output String = " + output_string)

### Save subprocess output to file
with open('file.txt', 'w') as my_file:
  subprocess.call(['ls', '-l'], stdout=my_file, stderr=my_file)
  
### MySQL Dump as subprocess
with open("mysqldump.sql",'wb') as out:
    subprocess.check_call(["mysqldump", "-u", "usernmae", "-ppassword", "-h", "dbserver_name", database_name], stdout=out)