python2 随机数列生成器

#filename:randNumber.py
import random
while True:
    try:
        row=int(raw_input('Enter the rows:'))
        cols=int(raw_input('then Enter the cols:'))
        minNum=int(raw_input('then Enter the minNumber:'))
        maxNum=int(raw_input('then Enter the maxNumber:'))
         
        r=0
        while r<row:
            line=''
            c=0
            while c<cols:
                s=random.randint(minNum,maxNum)
                line+=str(s)
                line+='    '
                c+=1
            r+=1
            print(line)
             
    except ValueError as err:
        print err