How can I check for a new line in string in Python 3.x?

Question

How to check for a new line in a string?

Does python3.x have anything similar to java's regular operation where direct if (x=='*\n') would have worked?

Answer 1

If you just want to check if a newline ( \\n ) is present, you can just use Python's in operator to check if it's in a string:

>>> "\n" in "hello\ngoodbye"
True

... or as part of an if statement:

if "\n" in foo:
    print "There's a newline in variable foo"

You don't need to use regular expressions in this case.

Answer 2

Yes, like this:

if '\n' in mystring:
    ...

(Python does have regular expressions, but they're overkill in this case.)

Answer 3

See:

https://docs.python.org/2/glossary.html#term-universal-newlines

A manner of interpreting text streams in which all of the following are recognized as ending a line: the Unix end-of-line convention '\\n', the Windows convention '\\r\\n', and the old Macintosh convention '\\r'. See PEP 278 and PEP 3116, as well as str.splitlines() for an additional use.

I hate to be the one to split hairs over this (pun intended), but this suggests that a sufficient test would be:

if '\n' in mystring or '\r' in mystring:
    ...

Answer 4

What about this, using str methods?

if len(mystring.splitlines()) > 1:
    print("found line breaks!")