awk command in subprocess.Popen - Getting Error - python-2.7

Question

I am trying this code:This code work fine and gave me the output what i need .
import os,sys
import sitenamevalidation
import getpass
import subprocess
site_name = sys.argv[1]
def get_location(site_name):
site_name_vali = sitenamevalidation.sitenamevalidation(site_name)
if site_name_vali == True:
pass
else:
print("Sitename should be in this format [a-z][a-z][a-z][0-9][0-9] example abc54 or xyz50")
sys.exit(0)
site = site_name[:3].upper()
user =getpass.getuser()
path = os.path.join('/home/',user,'location.attr')
if os.path.exists(path) == True:
pass
else:
print("Not able to find below path "+path)
#p1 = subprocess.Popen(['awk', '/site/{getline; print}' , path] ,stdout=subprocess.PIPE)
p1 = subprocess.Popen(['awk', '/ABC/{getline; print}' , path] ,stdout=subprocess.PIPE)
output=p1.communicate()
print str(output[0].strip().lower())
if __name__ == "__main__":
get_location(site_name)
Main issue is if i use this below command
p1 = subprocess.Popen(['awk', '/ABC/{getline; print}' , path] ,stdout=subprocess.PIPE)
where ABC is static value in path it work fine and give me desired output but i wanted the value which user will enter (site in my code). When i am doing this
p1 = subprocess.Popen(['awk', '/site/{getline; print}' , path] ,stdout=subprocess.PIPE)
It is looking for site in that file which is not there.I want the value of site variable to go in that command rather the site itself.Tried different by putting quote , double quote but nothing seem to be working.