Pasting code into the cmdline interpreter

[Veek M]

I wanted to test this piece of code which is Kate (editor) on the cmd 
line python >>> prompt:

tex_matches = re.findall(r'(\\\w+{.+?})|(\\\w+)', msg)
for tex_word in tex_matches:
    repl = unicode_tex.tex_to_unicode_map.get(tex_word)

    if repl is None:
      repl = 'err'

    msg = re.sub(re.escape(tex_word), repl, msg)


There are a number of difficulties i encountered.
1. I had to turn on <TAB> highlighting to catch mixed indent (which is a 
good thing anyways so this was resolved - not sure how tabs got in 
anyhow)
2. Blank lines in my code within the editor are perfectly acceptable for 
readability but they act as a block termination on cmd line. So if i 
paste:
tex_matches = re.findall(r'(\\\w+{.+?})|(\\\w+)', msg)
for tex_word in tex_matches:
    repl = unicode_tex.tex_to_unicode_map.get(tex_word)

    if repl is None:

I get:
 IndentationError: unexpected indent

How do i deal with this - what's the best way to achieve what I'm trying 
to do.