How Can I Check For A New Line In String In Python 3.x?

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?

Solution 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.

Solution 2:

Yes, like this:

if'\n'in mystring:
    ...

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

Solution 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:
    ...