Seating Plan Generator | Python Fiddle

import random
def used_check(student,array):
    isused=0
    for i in range(0,len(array)):
        if array[i]==student:
            isused=1
    if isused==1:
        return True
    else:
        return False
choice = (raw_input("Would you like to get a new plan or edit an existing one?")).lower()
if choice == "new plan":
    students = []
    running = 1
    while running:
        choice4 = (raw_input("Would you like to, 1) Input a new student, 2) Continue"))
        if choice4 == "1":
            students.append(raw_input("What is the student's full name?"))
        else:
            running = 0
    if len(students) < 32:
        while len(students) < 32:
            students.append("empty seat")
    running1 = 0
    classroom = [['empty seat','empty seat','empty seat','empty seat','empty seat','empty seat','empty seat','empty seat'],['empty seat','empty seat','empty seat','empty seat','empty seat','empty seat','empty seat','empty seat'],['empty seat','empty seat','empty seat','empty seat','empty seat','empty seat','empty seat','empty seat'],['empty seat','empty seat','empty seat','empty seat','empty seat','empty seat','empty seat','empty seat',]]
    used = []
    while running1 < (len(students)):
        num = random.randint(0,len(students)-1)
        if running1 > 0:
            isused1=used_check(students[num],used)
            if isused1==0:
                running1+=1
                used.append(students[num])
        else:
            used.append(students[num])
            running1+=1
    students=used
    ref=0
    for row in range(0,len(classroom)):
        for seat in range(0,len(classroom[row])):
            classroom[row][seat]=students[ref]
            ref+=1
    for t in range(0,len(classroom)):
        for i in range(0,len(classroom[t])):
            print "In row " + str(t) + ", seat " + str(i) + ", is " + classroom[t][i]
elif choice == "edit an existing one":
    running1 = 0
    classroom = [['empty seat','empty seat','empty seat','empty seat','empty seat','empty seat','empty seat','empty seat'],['empty seat','empty seat','empty seat','empty seat','empty seat','empty seat','empty seat','empty seat'],['empty seat','empty seat','empty seat','empty seat','empty seat','empty seat','empty seat','empty seat'],['empty seat','empty seat','empty seat','empty seat','empty seat','empty seat','empty seat','empty seat',]]
    used = []
    while running1 < (len(students)):
        num = random.randint(0,len(students))
        if running1 > 0:
            isused1=used_check(students[num],used)
            if isused1!=1:
                running1+=1
                used.append(students[num])
        else:
            used.append(students[num])
            running1+=1
    row = 0
    students=used
    ref=0
    for t in range(0,len(classroom)):
        for i in range(0,len(classroom[t])):
            classroom[t][i]=students[ref]
            ref+=1
    for t in range(0,len(classroom)):
        for i in range(0,len(classroom[t])):
            print "In row " + str(t) + ", seat " + str(i) + ", is " + classroom[t][i]

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