search string in file python

#!/usr/bin/python


try:
    name = raw_input("Enter file name: ")

    f = open(name, "r")
    if os.path.isfile(name):
        searchline = raw_input("enter search phrease: ")
        searchlines = f.readlines()
        for i, line in enumerate(searchlines):
            if searchline in line:
                for l in searchlines[i:i+2]:
                    print l,
                print
except IOError as e:
    print "I/O error ({0}): {1}".format(e.errno, e.strerror)