how to delete lines between specific signs in python?

Question

i need to search a bunch of text files which may contain content in this forms:

//for nv version
        tf = new TextField();
        tf.width = 600;
        tf.height = 300;
        tf.textColor = 0x00ffff;
        tf.mouseEnabled = false;
        this.addChild(tf);
        Sys.__consoleWindowFuncBasic = log;
//nv end

and delete the part between the 2 lines and save them.

i split the text into lines, and check the text line by line,thus make the work very heavy,is there any easy way for doing this?

Answer 1

Check this out

beginMarker = "//for nv version"
endMarker = "//nv end"

include = True
with open('path/to/input') as infile, open('path/to/output', 'w') as outfile:
    for line in infile:
        if include:
            if line.strip() != beginMarker:
                outfile.write(line)
            else:
                include = False
        else:
            if line.strip() == endMarker:
                include = True

Answer 2

Maybe you can try to use the regular expression to replace the match lines to an empty line. @yuwang provided a sed version, here is a python version( python re docs ):

>>> import re
>>> s = """some words
... other words
... //for nv version
...     tf = new TextField();
...     tf.width = 600;
...     tf.height = 300;
...     tf.textColor = 0x00ffff;
...     tf.mouseEnabled = false;
...     this.addChild(tf);
...     Sys.__consoleWindowFuncBasic = log;
... //nv end
... yet some other words
... """
>>> p = r"//for nv version(.*?)//nv end\n"  # reluctant instead of greedy
>>> print re.sub(p, "", s, flags=re.S) # use re.S to make `.` matchs `\n`
some words
other words
yet some other words