read lines

[Horacius ReX]

Hi, I have a text file like this;

1 -33.453579
2 -148.487125
3 -195.067172
4 -115.958374
5 -100.597841
6 -121.566441
7 -121.025381
8 -132.103507
9 -108.939327
10 -97.046703
11 -52.866534
12 -48.432623
13 -112.790419
14 -98.516975
15 -98.724436

So I want to write a program in python that reads each line and
detects which numbers of the second column are the maximum and the
minimum.

I tried with;

import os, sys,re,string

# first parameter is the name of the data file
name1 = sys.argv[1]
infile1 = open(name1,"r")

# 1. get minimum and maximum

minimum=0
maximum=0


print " minimum = ",minimum
print " maximum = ",maximum


while 1:
         line = infile1.readline()
         ll = re.split("\s+",string.strip(line))
	 print ll[0],ll[1]
	 a=ll[0]
	 b=ll[1]
	 print a,b
	 if(b<minimum):
			minimum=b
			print " minimum= ",minimum
	 if(b>maximum):
		 	maximum=b
			print " maximum= ",maximum

	 print minimum, maximum


But it does not work and I get errors like;

Traceback (most recent call last):
  File "translate_to_intervals.py", line 20, in <module>
    print ll[0],ll[1]
IndexError: list index out of range


Could anybody help me ?

Thanks