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Renaming columns in pandas
...place=True is necessary to avoid that gotchya.
– irritable_phd_syndrom
Jul 14 '17 at 13:24
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How to set up a PostgreSQL database in Django
...uth: no password supplied when I run python manage.py syncdb. I set random table name and user name.
– Yulong
Jun 18 '12 at 15:29
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MySql server startup error 'The server quit without updating PID file '
...efix mysql)" --datadir=/usr/local/var/mysql --tmpdir=/tmp
To set up base tables in another folder, or use a different user to run
mysqld, view the help for mysqld_install_db:
mysql_install_db --help
and view the MySQL documentation:
http://dev.mysql.com/doc/refman/5.5/en/mysql-install-db.html...
How to atomically delete keys matching a pattern using Redis
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Lua's unpack transforms a table in a "list of independent variables" (other languages call that explode) but the max number is not dependent on the syste memory; it's fixed in lua through the LUAI_MAXSTACK constant. In Lua 5.1 & LuaJIT it's 8000 a...
How can you strip non-ASCII characters from a string? (in C#)
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Range for printable characters is 0020-007E, for people looking for regular expression to replace non-printable characters
– Mubashar
Feb 17 '14 at 4:40
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What is P99 latency?
...ine that you are collecting performance data of your service and the below table is the collection of results (the latency values are fictional to illustrate the idea).
Latency Number of requests
1s 5
2s 5
3s 10
4s 40
5s 20
6s 15
7s 4
8s ...
How do I create a URL shortener?
...n auto-generated, unique numerical key (the auto-incremented id of a MySQL table for example).
For this example, I will use 12510 (125 with a base of 10).
Now you have to convert 12510 to X62 (base 62).
12510 = 2×621 + 1×620 = [2,1]
This requires the use of integer division and modulo. A pseudo...
Convert from enum ordinal to enum type
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This is very worrying because arrays are mutable. Even though values[] is final, it doesn't prevent Suit.values[0] = Suit.Diamonds; somewhere in your code. Ideally that will never happen, but the overall principle of don't expose mutable fields still holds. For this a...
Difference between “or” and || in Ruby? [duplicate]
...e can affect the outcome of statements.
Here's a ruby operator precedence table.
See this question for another example using and/&&.
Also, be aware of some nasty things that could happen:
a = false || true #=> true
a #=> true
a = false or true #=> true
a #=> false
Bot...
What is a reasonable length limit on person “Name” fields?
... gave the name field a limit of 50 characters to coincide with my database table where the field is varchar(50), but then I started to wonder.
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