FCFS (First Come First Serve) Process scheduling using python

FCFS.py

#!/usr/bin/env python
process_queue = []
total_wtime = 0
n = int(raw_input('Enter the total no of processes: '))
for i in xrange(n):
    process_queue.append([])#append a list object to the list
    process_queue[i].append(raw_input('Enter p_name: '))
    process_queue[i].append(int(raw_input('Enter p_arrival: ')))
    total_wtime += process_queue[i][1]
    process_queue[i].append(int(raw_input('Enter p_bust: ')))
    print ''

process_queue.sort(key = lambda process_queue:process_queue[1])

print 'ProcessName\tArrivalTime\tBurstTime'
for i in xrange(n):
    print process_queue[i][0],'\t\t',process_queue[i][1],'\t\t',process_queue[i][2]
    
print 'Total waiting time: ',total_wtime
print 'Average waiting time: ',(total_wtime/n)

in 11 line i am facing a problem that it is not runnning in python please tell sir what a proble

this code is written in python2 .
and if I'm not wrong you are using python 3 . That's why it shows an error.

#!/usr/bin/env python
process_queue = []
total_wtime = 0
n = int(input('Enter the total no of processes: '))
for i in range(n):
process_queue.append([])#append a list object to the list
process_queue[i].append(input('Enter p_name: '))
process_queue[i].append(int(input('Enter p_arrival: ')))
total_wtime += process_queue[i][1]
process_queue[i].append(int(input('Enter p_bust: ')))
print ("")

process_queue.sort(key = lambda process_queue:process_queue[1])

print ("ProcessName\tArrivalTime\tBurstTime")
for i in range(n):
print (process_queue[i][0],'\t\t',process_queue[i][1],'\t\t',process_queue[i][2])

print ('Total waiting time: ',total_wtime)
print ('Average waiting time: ',(total_wtime/n))