python: error when executing subprocess.popen

Question

when I execute the following function in centos, I get the error

def install_requests_lib():
   try:
      import requests
      return
   except ImportError, e:
      print "module does not exist, installing..."
      if(platform.system().lower()=='darwin'):
          print "install requests before proceeding, run **sudo pip install requests**"
          sys.exit(2)
      elif(platform.system().lower()=='linux'):
          print "installing"
          p=Popen(["yum","-y","install","python-requests"], stdout=PIPE, shell=True)
          p.communicate()
          print p.returncode

error:

module does not exist, installing...
installing
You need to give some command
1

I cannot figure out what is wrong.

I executed with stdin=PIPE argument, still I get the same error.

Does your script have permissions to do yum install? You can also redirect stderr to stdout to see all output. — grundic
– grundic, Commented May 8, 2017 at 19:36

Community · Accepted Answer · 2017-05-23 11:54:53Z

1

The arguments in your arg list after "yum" aren't being executed if you give the argument shell=True. Remove the shell=True argument and it should work.

Alternatively, you could supply the full command line as a string and keep the shell=True argument:

p=Popen("yum install -y python-requests", stdout=PIPE, shell=True)

but it's generally discouraged to do so, for many reasons.

edited May 23, 2017 at 11:54

CommunityBot

11 silver badge

answered May 8, 2017 at 19:37

Billy

5,6592 gold badges31 silver badges57 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

grundic · Accepted Answer · 2017-05-08 19:37:12Z

1

You are trying to execute yum -y install, when you mean yum install -y.

answered May 8, 2017 at 19:37

grundic

5,0074 gold badges35 silver badges51 bronze badges

Collectives™ on Stack Overflow

python: error when executing subprocess.popen

2 Answers 2

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related