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How do I use vim registers?
...ecide that you need to add a percentage sign at the end of the %Dev field (starting from 2nd line). We'll make a simple macro in the (arbitrarily selected) m register as follows:
Press: qm: To start recording macro under m register.
EE: Go to the end of the 3rd column.
a: Insert mode to append to...
Should I use `import os.path` or `import os`?
...gic with sys.modules to inject os.path. Here's what happens:
When Python starts up, it loads a bunch of modules into sys.modules. They aren't bound to any names in your script, but you can access the already-created modules when you import them in some way.
sys.modules is a dict in which modules...
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?
...
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?
...
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:
[[ $date =~ ^regex$ ]...