Delete lines from a string that contains a keyword

[JellyCreeper6]

As stated in the title, I want to delete lines from a string that contains a certain keyword.

This is the first line
This is the second line
This is the third line

The keyword is second, so the output will be this.

This is the first line
This is the third line

How do I do this?

[bowlofred]

Is it truly all in a single string? Generally want to split it by lines and then process the lines.

>>> print(s)
This is the first line
This is the second line
This is the third line

>>> print("\n".join(x for x in s.splitlines() if "second" not in x))
This is the first line
This is the third line

[JellyCreeper6]

Is it truly all in a single string? Generally want to split it by lines and then process the lines.

>>> print(s)
This is the first line
This is the second line
This is the third line

>>> print("\n".join(x for x in s.splitlines() if "second" not in x))
This is the first line
This is the third line

Yes, it is all in one string. Your code seems to work for me, thank you

[perfringo]

I want to delete lines from a string that contains a certain keyword.
How do I do this?

You can't do that. Strings are immutable so you cant delete lines. This does not mean that you can't achieve desired result but it will not be 'deleting lines from string'. It will be either printing selected parts from string or creating new string. In code above s have not changed and no lines are deleted from string.

[JellyCreeper6]

I want to delete lines from a string that contains a certain keyword.
How do I do this?

You can't do that. Strings are immutable so you cant delete lines. This does not mean that you can't achieve desired result but it will not be 'deleting lines from string'. It will be either printing selected parts from string or creating new string. In code above s have not changed and no lines are deleted from string.

Well, creating a new string is what I meant then, my bad