Performance effect of using print statements in Python script

Question

I have a Python script that process a huge text file (with around 4 millon lines) and writes the data into two separate files.

I have added a print statement, which

Answer 1

Tried doing it in a very simple script just for fun, the difference is quite staggering:

In large.py:

target =  open('target.txt', 'w')

for item in xrange(4000000):
    target.write(str(item)+'\n')
    print item

Timing it:

[gp@imdev1 /tmp]$ time python large.py
real    1m51.690s
user    0m10.531s
sys     0m6.129s

gp@imdev1 /tmp]$ ls -lah target.txt 
-rw-rw-r--. 1 gp gp 30M Nov  8 16:06 target.txt

Now running the same with "print" commented out:

gp@imdev1 /tmp]$ time python large.py 
real    0m2.584s
user    0m2.536s
sys     0m0.040s