Get Line Number of certain phrase in file Python

Question

I need to get the line number of a phrase in a text file. The phrase could be:

the dog barked 

I need to open the file, search it for that phrase and print the line number.

I'm using Python 2.6 on Windows XP

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This Is What I Have:

o = open("C:/file.txt") j = o.read() if "the dog barked" in j:      print "Found It" else:      print "Couldn't Find It" 

This is not homework, it is part of a project I am working on. I don't even have a clue how to get the line number.

Answer 1

lookup = 'the dog barked'  with open(filename) as myFile:     for num, line in enumerate(myFile, 1):         if lookup in line:             print 'found at line:', num 

Answer 2

f = open('some_file.txt','r') line_num = 0 search_phrase = "the dog barked" for line in f.readlines():     line_num += 1     if line.find(search_phrase) >= 0:         print line_num 

EDIT 1.5 years later (after seeing it get another upvote): I'm leaving this as is; but if I was writing today would write something closer to Ash/suzanshakya's solution:

def line_num_for_phrase_in_file(phrase='the dog barked', filename='file.txt')     with open(filename,'r') as f:         for (i, line) in enumerate(f):             if phrase in line:                 return i     return -1 

• Using with to open files is the pythonic idiom -- it ensures the file will be properly closed when the block using the file ends.
• Iterating through a file using for line in f is much better than for line in f.readlines(). The former is pythonic (e.g., would work if f is any generic iterable; not necessarily a file object that implements readlines), and more efficient f.readlines() creates an list with the entire file in memory and then iterates through it. * if search_phrase in line is more pythonic than if line.find(search_phrase) >= 0, as it doesn't require line to implement find, reads more easily to see what's intended, and isn't easily screwed up (e.g., if line.find(search_phrase) and if line.find(search_phrase) > 0 both will not work for all cases as find returns the index of the first match or -1).
• Its simpler/cleaner to wrap an iterated item in enumerate like for i, line in enumerate(f) than to initialize line_num = 0 before the loop and then manually increment in the loop. (Though arguably, this is more difficult to read for people unfamiliar with enumerate.)

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