searching a pattern in a file

[shivakumars]

how to search particular strings in a file. and display it plz send me the python command

[eso40043]

I'm new to Python myself, but this I can answer. Though it really depends how you are handling that file, something like this works:

>>> s="hello, how are you?"
>>> print "hell" in s
True

or if it's a complex and varying pattern you're looking for you could use regular expressions,
http://www.amk.ca/python/howto/regex/

[bvdet]

how to search particular strings in a file. and display it plz send me the python command

This will return a string index list of the occurrences of a substring found in a file:

def indexList(s, item, i=0):
    i_list = []
    while True:
        try:
            i = s.index(item, i)
            i_list.append(i)
            i += 1
        except:
            break
    return i_list
 
fStr = open('data_file').read()
matchStr = 'some string'
matchList = indexList(fStr, matchStr)
print matchList

In my test case:
>>> [201, 327, 1439, 1488]

[shivakumars]

This will return a string index list of the occurrences of a substring found in a file:

def indexList(s, item, i=0):
    i_list = []
    while True:
        try:
            i = s.index(item, i)
            i_list.append(i)
            i += 1
        except:
            break
    return i_list
 
fStr = open('data_file').read()
matchStr = 'some string'
matchList = indexList(fStr, matchStr)
print matchList

In my test case:
>>> [201, 327, 1439, 1488]

thanks dude.. it was so help full to me and i got good ideas to do more