Error when combining python script in a bash for loop

Question

Warning: very new to python

I am trying to connect to a series of IP addresses stored in an array ${INSTANCE_IPS[@]}. I am trying to use a for loop to use a python script to call an API to each IP address in the array.

However, when trying to run the below script I get the error:

Traceback (most recent call last):
File "<stdin>", line 12, in <module>
TypeError: unsupported operand type(s) for +: 'NoneType' and 'str'
Traceback (most recent call last):
File "<stdin>", line 12, in <module>
TypeError: unsupported operand type(s) for +: 'NoneType' and 'str'

I'm sure I could do a for loop in python but I haven't learnt that yet and for the moment just need to get this working. It runs fine if I only use one IP address from the array.

for instance in ${INSTANCE_IPS[@]}
do
  echo "Connecting to $instance"

  /usr/bin/python << END_OF_PYTHON

  import requests
  import json
  import sys
  import socket
  import fnmatch
  import os

  ipaddress = os.getenv('instance')
  print ipaddress

  port = ':80'
  updatedipaddress = ipaddress +port
  print 'updated ip address is ' + updatedipaddress

  add_node = updatedipaddress

  print 'add_node is ' + add_node

  url = 'https://' + os.getenv('instance') + ':9070/api/tm/1.0/config/active/pools/' + 'aol_http'
  print 'url is ' + url
  jsontype = {'content-type': 'application/json'}
  client = requests.Session()
  client.auth = ('username', 'password')
  client.verify = 0

  response = client.get(url)
  print response
  pools = json.loads(response.content)
  nodes = pools['properties']['basic']['nodes']

  data = nodes
  data.append(unicode(add_node))

  client.put(url,json.dumps(pools), headers=jsontype)
  END_OF_PYTHON
done

Any help with figuring out where I am going wrong would be appreciated.

Cheers

END_OF_PYTHON may not be indented (unless by one or more tabs and you use <<-END_OF_PYTHON as the beginning of the here document). — chepner
– chepner, Commented May 4, 2014 at 14:27

Erikw · Accepted Answer · 2014-05-04 09:07:47Z

5

The bash variable instance is not passed on to subprocesses. You have to export it before starting the python code. This can be seen in the error message about ipaddress + port as ipdadress is of NoneType meaning that os.getenv() did not work.

for instance in ${INSTANCE_IPS[@]}
do
  echo "Connecting to $instance"
  export instance

  /usr/bin/python << END_OF_PYTHON
   [...]

answered May 4, 2014 at 9:07

Erikw

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1 Comment

user000001 Over a year ago

Or he could use the shell variable directly in the heredoc, like url = 'https://${instance}:9070/....

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