import syntax
Tim Chase
python.list at tim.thechases.com
Mon Jul 29 16:14:45 EDT 2013
On 2013-07-29 15:48, Devyn Collier Johnson wrote:
> The PEP8 recommends importing like this:
>
> import os
> import re
>
> not like this:
>
> import os, re
>
> Why is that? Is there a performance advantage to one of the styles?
While I don't believe there's much of a performance difference (if
so, it should be pretty negligible, especially since imports are
usually just done at load-time rather than run-time), but
1) it's easier to read one-per-line (IMHO), particularly if you sort
them alphabetically
2) it makes for cleaner diffs
Which would you rather read and try to figure out what's going on?
=====================================
--- before.py 2013-07-29 15:04:38.250996094 -0500
+++ after.py 2013-07-29 15:04:44.026996132 -0500
@@ -1 +1 @@
-import csv, re, sys, os
+import csv, re, sys, glob, os
=====================================
vs.
=====================================
--- before.py 2013-07-29 15:13:13.050997907 -0500
+++ after.py 2013-07-29 15:13:18.434997950 -0500
@@ -1,4 +1,5 @@
import csv
+import glob
import os
import re
import sys
=====================================
The latter makes it much easier (at least for me) to spot that "glob"
was added. And it's more tolerant of merge-conflict resolution.
-tkc
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