3 ms·

It is actually slower. Adding an f8 function using the ''.join() method: sikanda-13:30:02:/tmp$ python f.py [...] f1 0.07 f2 0.12 f3 0.07 f4 0.06

• scott_s 16y ago
  My results agree with yours, in terms of who wins. Python 2.6 (2.4 is similar, and 3.0 is as well, for the techniques that were still valid) on OSX 10.5, Intel Core Duo at 2 GHz: [scotts@silver]$ /opt/local/bin/python2.6 f.py f1 0.107 f2 0.19 f3 0.106 f4 0.097 f5 0.139 f6 0.073 f7 0.025 f8 0.103 edit: I added a ninth function, def f9(list): return ''.join(map(chr, list)) To test if the difference between f8 and f6 was the list comprehension or the joinfields method. A result of 0.072 tells me it's the list comprehension. The only difference between f8 and f9 is list comprehension versus map. That leads me to conclude that map is indeed a faster way to construct a list than a list comprehension. (Although this may change for a user-defined function. I could test this, but I've spent enough time already.)