How can I detect DOS line breaks in a file?

Question

I have a bunch of files. Some are Unix line endings, many are DOS. I\'d like to test each file to see if if is dos formatted, before I switch the line endings.

How

Answer 1

As a complete Python newbie & just for fun, I tried to find some minimalistic way of checking this for one file. This seems to work:

if "\r\n" in open("/path/file.txt","rb").read():
    print "DOS line endings found"

Edit: simplified as per John Machin's comment (no need to use regular expressions).