What is the pythonic way to write strings to file?

Question

What's the difference between using File.write() and print>>File,?

Which is the pythonic way to write to file?

>>> with open('out.txt','w') as fout:
...     fout.write('foo bar')
... 

>>> with open('out.txt', 'w') as fout:
...     print>>fout, 'foo bar'
...

Is there an advantage when using print>>File, ?

Agreed. The second is primarily to make C developers feel at home. — rlms, Jan 01 '14 at 12:20
In python3, the second will be `print('foo bar', file=fout)`, but the first one keeps the same. — iMom0, Jan 01 '14 at 12:20
You should take a look [here](http://stackoverflow.com/a/3263763/1525683) for a proper explanation btw — Glabsounet, Jan 01 '14 at 12:24
These do different things. Even if you stick a comma on the end of the print statement, the soft-space feature will ruin your day. — user2357112, Jan 01 '14 at 12:35

volcano · Accepted Answer · 2014-01-01T12:48:29.337

10

write() method writes to a buffer, which (the buffer) is flushed to a file whenever overflown/file closed/gets explicit request (.flush()).

print will block execution till actual writing to file completes.

The first form is preferred because its execution is more efficient. Besides, the 2nd form is ugly and un-pythonic.

edited Jan 01 '14 at 12:48

answered Jan 01 '14 at 12:18

volcano

score 0 · Answer 2 · answered Jan 01 '14 at 12:16

0

The most pythonic way is the .write().

I didn't even know the other way, but it doesn't even work with Python 3.3

A similar way of doing it would be:

fout = open("out.txt", "w")
fout.write("foo bar")
#fout.close() if you were done with the writing

answered Jan 01 '14 at 12:16

RGS

3

Python 3 changed `print` to a function, so the syntax is different: `print("some string", file=fout)` – Tim Jan 01 '14 at 12:43

2 Answers2