How can you use Python in Vim?

Question

I waste a lot of time between Vim and Python. I find it too slow to manually copy-paste from Python to Vim and vice versa. A good broken example is:

%!python for i in xrange(25); print 6*i \n

How can you do such tweaks direcly in Vim? [Solved]

[Clarification] I need things to Vim, like printing sequences, arithmetics... - things I cannot do in Vim.

[?] Can someone elaborate this point: "your script can read from stdin to operate directly on the lines given (., %, ...)."

[Further Clarification]

If I want to print 'Hello' to lines 4,5, 6 and 7, what is wrong:

:4-7!python -c "print 'hello'"

The dot . modifies the current line. Can I print on multiple lines 7, 32 and 99:

:7,32,99!python -c "print 'hello'"

Clearly not working. How?

Answer 1

In any of your vim windows, type something like this:

for x in range(1,10):     print '-> %d' % x 

Visually select both of those lines (V to start visual mode), and type the following:

:!python 

Because you pressed ':' in visual mode, that will end up looking like:

:'<,'>!python 

Hit enter and the selection is replaced by the output of the print statements. You could easily turn it into a mapping:

:vnoremap <f5> :!python<CR>