Question

python:
how do i read from a file and then take the first two collumns and save them. to then compare the lines information?

Answer 1

def star:
f= open("star.txt")
line=f.readlines()
for l in lines:
l.split(",")= lat , lon // the info from the first two collumns, which are separated by ","
....
now :
how do i compare the lat , lon of the first line and then next lines?

Answer 2

What do you mean by compare?

Answer 3

l is going to be a list of the strings between commas in the input line. This may work:

def star():
prevLat = 0.0
prevLong = 0.0
lat = 0.0
long = 0.0

try:
file = open( "star.txt" )
for line in file.readline():
l = line.split( ',' )
prevLat = lat
prevLong = long
lat = float( l[ 0 ] )
long = float( l[ 1 ] )

if( lat > prevLat ):
print "north"
elif( lat < prevLat ):
print "south"
elif( long > prevLong ):
print "east"
else:
print "west"

file.close()

else:
print "the program made a boo boo"