os.system | 易学教程

Why is python no longer waiting for os.system to finish?

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问题 I have the following function, which has been working great for months. I have not updated my version of Python (unless it happens behind the scenes?). def Blast(type, protein_sequence, start, end, genomic_sequence): result = [] M = re.search('M', protein_sequence) if M: query = protein_sequence[M.start():] temp = open("temp.ORF", "w") print >>temp, '>blasting' print >>temp, query temp.close() cline = blastp(query="'temp.ORF'", db="DB.blast.txt", evalue=0.01, outfmt=5, out=type + ".BLAST") os

Redirecting stdio from a command in os.system() in Python

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Usually I can change stdout in Python by changing the value of sys.stdout . However, this only seems to affect print statements. So, is there any way I can suppress the output (to the console), of a program that is run via the os.system() command in Python? You could consider running the program via subprocess.Popen , with subprocess.PIPE communication, and then shove that output where ever you would like, but as is, os.system just runs the command, and nothing else. from subprocess import Popen, PIPE p = Popen(['command', 'and', 'args'], stdout=PIPE, stderr=PIPE, stdin=PIPE) output = p.stdout

Return value of x = os.system(..) [duplicate]

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问题 This question already has answers here : What is the return value of os.system() in Python? (5 answers) Closed 3 years ago . When I type os.system("whoami") in Python, as root, it returns root , but when I try to assign it to a variable x = os.system("whoami") it set's the value of x to 0. Why ? (: 回答1: os.system() returns the (encoded) process exit value. 0 means success: On Unix, the return value is the exit status of the process encoded in the format specified for wait() . Note that POSIX

Linux command-line call not returning what it should from os.system?

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I need to make some command line calls to linux and get the return from this, however doing it as below is just returning 0 when it should return a time value, like 00:08:19 , I am testing the exact same call in regular command line and it returns the time value 00:08:19 so I am confused as to what I am doing wrong as I thought this was how to do it in python. import os retvalue = os.system("ps -p 2993 -o time --no-headers") print retvalue pyfunc What gets returned is the return value of executing this command. What you see in while executing it directly is the output of the command in stdout.

Python: How to get stdout after running os.system?

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I want to get the stdout in a variable after running the os.system call. Lets take this line as an example: batcmd="dir" result = os.system(batcmd) result will contain the error code ( stderr 0 under Windows or 1 under some linux for the above example). How can I get the stdout for the above command without using redirection in the executed command? If all you need is the stdout output, then take a look at subprocess.check_output() (added in Python 2.7): import subprocess batcmd="dir" result = subprocess.check_output(batcmd, shell=True) Because you were using os.system() , you'd have to set

return value from one python script to another

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问题 I have two files: script1.py and script2.py. I need to invoke script2.py from script1.py and return the value from script2.py back to script1.py. But the catch is script1.py actually runs script2.py through os. script1.py: import os print(os.system("script2.py 34")) script2.py import sys def main(): x="Hello World"+str(sys.argv[1]) return x if __name__ == "__main__": x= main() As you can see, I am able to get the value into script2, but not back to script1. How can I do that? NOTE: script2.py

Linux command-line call not returning what it should from os.system?

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问题 I need to make some command line calls to linux and get the return from this, however doing it as below is just returning 0 when it should return a time value, like 00:08:19 , I am testing the exact same call in regular command line and it returns the time value 00:08:19 so I am confused as to what I am doing wrong as I thought this was how to do it in python. import os retvalue = os.system(\"ps -p 2993 -o time --no-headers\") print retvalue 回答1: What gets returned is the return value of

Python: How to get stdout after running os.system?

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问题 I want to get the stdout in a variable after running the os.system call. Lets take this line as an example: batcmd=\"dir\" result = os.system(batcmd) result will contain the error code ( stderr 0 under Windows or 1 under some linux for the above example). How can I get the stdout for the above command without using redirection in the executed command? 回答1: If all you need is the stdout output, then take a look at subprocess.check_output(): import subprocess batcmd="dir" result = subprocess