Python popen 命令。请等待该命令完成

What you are looking for is the wait method.

Depending on how you want to work your script you have two options. If you want the commands to block and not do anything while it is executing, you can just use subprocess.call.

#start and block until done
subprocess.call([data["om_points"], ">", diz['d']+"/points.xml"])

If you want to do things while it is executing or feed things into stdin, you can use communicate after the popen call.

#start and process things, then wait
p = subprocess.Popen([data["om_points"], ">", diz['d']+"/points.xml"])
print "Happens while running"
p.communicate() #now wait plus that you can send commands to process

As stated in the documentation, wait can deadlock, so communicate is advisable.

You can you use subprocess to achieve this.

import subprocess


#This command could have multiple commands separated by a new line \n
some_command = "export PATH=$PATH://server.sample.mo/app/bin \n customupload abc.txt"


p = subprocess.Popen(some_command, stdout=subprocess.PIPE, shell=True)


(output, err) = p.communicate()


#This makes the wait possible
p_status = p.wait()


#This will give you the output of the command being executed
print "Command output: " + output

Let the command you are trying to pass be

os.system('x')

then you covert it to a statement

t = os.system('x')

now the python will be waiting for the output from the commandline so that it could be assigned to the variable t.

wait() works fine for me. The subprocesses p1, p2 and p3 are executed at the same. Therefore, all processes are done after 3 seconds.

import subprocess


processes = []


p1 = subprocess.Popen("sleep 3", stdout=subprocess.PIPE, shell=True)
p2 = subprocess.Popen("sleep 3", stdout=subprocess.PIPE, shell=True)
p3 = subprocess.Popen("sleep 3", stdout=subprocess.PIPE, shell=True)


processes.append(p1)
processes.append(p2)
processes.append(p3)


for p in processes:
if p.wait() != 0:
print("There was an error")


print("all processed finished")

Force popen to not continue until all output is read by doing:

os.popen(command).read()

I think process.communicate() would be suitable for output having small size. For larger output it would not be the best approach.