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How to get line count of a large file cheaply in Python?
...ge(5):
for func in [mapcount, simplecount, bufcount, opcount]:
start_time = time.time()
assert func("big_file.txt") == 1209138
counts[func].append(time.time() - start_time)
for key, vals in counts.items():
print key.__name__, ":", sum(vals) / float(len(vals))
...
How to add column if not exists on PostgreSQL?
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Am not sure why just starting the anonymous code block with DO $$ fails. I did try DO $$; which fails too, until I just started the block with DO $$DECLARE r record; which is given in an example on the dev postgres docs.
– n...
iOS: Multi-line UILabel in Auto Layout
...
An issue for me since I started running on an iOS 9 sim but when I tested on iOS 8 then the trouble started. I need to set the max width manually.
– naz
Nov 6 '15 at 6:19
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How to write DataFrame to postgres table?
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Starting from pandas 0.14 (released end of May 2014), postgresql is supported. The sql module now uses sqlalchemy to support different database flavors. You can pass a sqlalchemy engine for a postgresql database (see docs). E...
Naming convention for unique constraint
... is also a key but only when unique. Otherwise it's an index. So then we'd start with IK_columnname for unique indexes and IX_columnname for non-unique indexes. Marvellous.
And the only difference between a unique constraint and a unique index is INCLUDE columns.
Edit: Feb 2013. Since SQL Server ...
Using semicolon (;) vs plus (+) with exec in find
...ommand is run once for each matched file.
The command is executed in the starting directory. There are
unavoidable security problems surrounding use of the -exec option;
you should use the -execdir option instead.
-exec command {} +
This variant of the -exec option runs the specified com...
How does one change the language of the command line interface of Git?
...s to ~/.bashrc the alias will be defined when a new interactive shell gets started. In case you added it to ~/.bash_profile the alias will be applied when logging in.
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Check if a string matches a regex in Bash script
...# | either 01...09 either 01..09 end of line
# start of line or 10,11,12 or 10..29
# or 30, 31
That is, you can define a regex in Bash matching the format you want. This way you can do:
[[ $date =~ ^regex$ ]...
Convert Unicode to ASCII without errors in Python
... a question on SO, and getting all these preachy responses. "My car won't start." "Why do you want to start your car? You should walk instead." Stop it!
– shanusmagnus
Aug 30 '13 at 17:49
...
Android adding simple animations while setvisibility(view.Gone)
...w.animate().translationY(view.getHeight());
This returns the View to its starting position after it has been moved somewhere else:
view.animate().translationY(0);
You can also use setDuration() to set the duration of the animation. For example this fades out a View over a period of 2 seconds:
...