Python json

import time
import sys
import datetime
from influxdb import InfluxDBClient
import Adafruit_DHT
import json

# Set this variables, influxDB should be localhost on Pi
host = "localhost"
port = 8086
user = "pi"
password = "Missyoujack1."

# The database we created
dbname = "logger"
# Sample period (s)
interval = 1

# Allow user to set session and runno via args otherwise auto-generate
if len(sys.argv) > 1:
    if (len(sys.argv) < 3):
        print "Must define session and runNo!!"
        sys.exit()
    else:
        session = sys.argv[1]
        runNo = sys.argv[2]
else:
    session = "dev"
    now = datetime.datetime.now()
    runNo = now.strftime("%Y%m%d%H%M")

print "Session: ", session
print "runNo: ", runNo

# Create the InfluxDB object
client = InfluxDBClient(host, port, user, password, dbname)

# Run until keyboard out
try:
    while True:
        # This gets a dict of the three values
        iso = time.ctime()
        humidity, temperature = Adafruit_DHT.read_retry(Adafruit_DHT.DHT22, 4)
        if humidity is not None:
                humidity_1 = humidity
        if temperature is not None:
                temperature_1 = temperature

        json_body = [
        {
          "measurement": session,
              "tags": {
                  "run": runNo,
                  },
              "time": iso,
              "fields": {
                  "humidity" : format(humidity_1, '.2f'),
                  "temperature" : format(temperature_1, '.2f')

          }
          }
        ]

        # Write JSON to InfluxDB
        client.write_points(json_body)
        # Wait for next sample
        time.sleep(interval)

except KeyboardInterrupt:
    pass