running multiple bash commands with subprocess

If I run echo a; echo b in bash the result will be that both commands are run. However if I use subprocess then the first command is run, printing out the whole of the rest of the line. The code below echos a; echo b instead of a b, how do I get it to run both commands?

import subprocess, shlex
def subprocess_cmd(command):
    process = subprocess.Popen(shlex.split(command), stdout=subprocess.PIPE)
    proc_stdout = process.communicate()[0].strip() 
    print proc_stdout

subprocess_cmd("echo a; echo b")

Answer

You have to use shell=True in subprocess and no shlex.split:

import subprocess

command = "echo a; echo b"

ret = subprocess.run(command, capture_output=True, shell=True)

# before Python 3.7:
# ret = subprocess.run(command, stdout=subprocess.PIPE, shell=True)

print(ret.stdout.decode())

returns:

a
b