Python Grep Reverse Matching

I would like to build a small python script that basicaly does the reverse of grep. I want to match the files in a directory/subdirectory that doesn't have a 'searched_string'. So

Solution 1:

To check if a file with a path bound to variable f contains a string bound to name s, simplest (and acceptable for most reasonably-sized files) is something like

with open(f) as fp:
    if s in fp.read():
        print'%s has the string' % f
    else:
        print'%s doesn't have the string' % f

In your os.walk loop, you have the root path and filename separately, so

f = os.path.join(path, name)

(what you're unconditionally printing) is the path you want to open and check.

Solution 2:

Instead of printing file name call function that will check if file content do not match texts you want to have in source files. In such cases I use check_file() that looks like this:

WARNING_RX = (
    (re.compile(r'if\s+\(!\s+user.hasPermission'), 'user.hasPermission'),
    (re.compile(r'other regexp you want to have'), 'very important'),
    )

defcheck_file(fn):
    f = open(fn, 'r')
    content = f.read()
    f.close()
    for rx, rx_desc in WARNING_RX:
        ifnot rx.search(content):
            print('%s: not found: %s' % (fn, rx_desc))