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- #Python subprocess get output as string how to#
- #Python subprocess get output as string code#
- #Python subprocess get output as string windows#
read () if not data : # the flow ready in reading which has no data # is a closed flow # thus we must stop to watch it inputs. select ( inputs, ,, 1 ) while readable and inputs : for flow in readable : data = flow. readable, writable, exceptional = select. Line 12: The subprocess.Popen command to execute the command with shellFalse. Line 9: Print the command in list format, just to be sure that split () worked as expected. Line 6: We define the command variable and use split () to use it as a List. poll () is None : # select has 3 parameters, 3 lists, the sockets, the fileobject to watch # in reading, writing, the errors # in addition a timeout option (the call is blocking while a fileObject # is not ready to be processed) # by return we get 3 lists with the fileObject to be processed # in reading, writing, errors. Here, Line 3: We import subprocess module. Import select process_ = Popen ( 'blastall -p blastp -d uniprot_sprot \ -i DataBio/Sequences/Proteique/abcd2_mouse.fa', shell = True, shell = True, stdout = PIPE, stdin = None, stderr = PIPE, ) inputs = while process_. poll ( 1 ) # the number as argument is the timeout (in millisecond) # if we deregister the 2 flow at this point, we stay blocked at this instruction. unregister ( fd ) # handle the error events = poller. EPOLLERR : # an error on the fd has occurred poller. EPOLLHUP : # the fd has been closed by the source poller. EPOLLPRI ): # some data are ready to be read if fd = process_. poll () while events : for fd, flag in events : if flag & ( select. # beware this is a blocking call while a fd is not ready (we provide a timeout as argument) events = poller.
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will set the variable output to the string foo, and the variable status. # fd is a file descriptor # flag match a combination of # select.POLLIN | select.POLLPRI | select.POLLHUP | select.POLLERR # this list match with the fd ready to be processed in # reading or writing depending of their creation. Octave includes some high-level commands like system and popen for starting. poll () is None : # at each poll call we have a list of tuple with 2 int. stderr, READ_ONLY ) #start watching the flows while process_. poll () # register the flow with reading filter poller. POLLERR # create a poll object poller = select. Import select process_ = Popen ( 'blastall -p blastp -d uniprot_sprot \ -i DataBio/Sequences/Proteique/abcd2_mouse.fa', shell = True, shell = True, stdout = PIPE, stdin = None, stderr = PIPE, ) READ_ONLY = select.
#Python subprocess get output as string windows#
On windows select and poll work on sockets, for the others OS it works also on the files and pipes. This module provide 2 functions select and poll available for most of the operating system and epoll for linux > kernel 2.5 and kqueue on BSD. To consume several flow at the same time we can use the select module.
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and we have to consume the both output in the same time. The subprocess module allows you to spawn new processes, connect to their input/output/error pipes, and obtain their return codes. The poll method return None while the subprocess is running. So we should not use wait the end of subprocess but use a loop while and the poll method. python wait the subprocess which wait python consume the buffers. But the subprocessįilled the buffer if this one is full. The call tho the wait method block the python script execution until the subprocess is finished.
#Python subprocess get output as string code#
wait () print "This code could never be executed" From subprocess import Popen, PIPE blast_process = Popen ( 'blastall -p blastp -d uniprot_sprot \ -i DataBio/Sequences/Proteique/abcd2_mouse.fa', shell = True, stdout = PIPE, stderr = PIPE ) blast_process.
#Python subprocess get output as string how to#
Here is an example to show how to use subprocess.checkoutout (): > tsubprocess.checkoutput df -h, shellTrue) > type (t)You can decode the byte string to string using decode () function.