Question

How can I check if a line exists in a file?

I’d also like to write the line to the file if it does not exist.

This is my current attempt:

logfile = open('ip.log', 'a+')

while 1:
    line = logfile.readline()
    #line.replace("\n", "")
    print line
        
    if line == str(self.CLIENT_HOST):
        print "Line Found Skipping"
    else:
        logfile.write(str(self.CLIENT_HOST)+"\n")
    if not line:
        print "EOF Reached"
        break
    print line
logfile.close()

Answer 1

logfile = open('ip.log', 'r')
loglist = logfile.readlines()
logfile.close()
found = False
for line in loglist:
    if str(self.CLIENT_HOST) in line:
        print "Found it"
        found = True

if not found:
    logfile = open('ip.log', 'a')
    logfile.write(str(self.CLIENT_HOST)+"\n")
    logfile.close()

This is my first quick solution. Very unclean and not yet sophisticated, but should work.