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?

Asked By: change

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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 "hellongoodbye"
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.

Answered By: Mark Longair

Answer 2

Yes, like this:

if 'n' in mystring:
    ...

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

Answered By: RichieHindle

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 ‘rn’, 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:
    ...

Answered By: AlanSE

Answer 4

What about this, using str methods?

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

Answered By: MuellerSeb

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

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