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Python List vs. Array - when to use?
...
Basically, Python lists are very flm>ex m>ible and can hold completely heterogeneous, arbitrary data, and they can be appended to very efficiently, in amortized constant time. If you need to shrink and grow your list time-efficiently and without hassle, they are t...
How to call shell commands from Ruby
...ed backticks – `cmd`
This is like many other languages, including Bash, m>PHP m>, and Perl.
Returns the result (i.e. standard output) of the shell command.
Docs: http://ruby-doc.org/core/Kernel.html#method-i-60
value = `echo 'hi'`
value = `#{cmd}`
Built-in syntax, %x( cmd )
Following the x charac...
How to determine whether a Pandas Column contains a particular value
...e. I tried to do this with if x in df['id'] . I thought this was working, m>ex m>cept when I fed it a value that I knew was not in the column 43 in df['id'] it still returned True . When I subset to a data frame only containing entries matching the missing id df[df['id'] == 43] there are, obviously...
jQuery Validate Plugin - How to create a simple custom rule?
... {
amount : { greaterThanZero : true }
}
});
Just change the contents of the 'addMethod' to validate your checkboxes.
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Assign output of os.system to a variable and prevent it from being displayed on the screen [duplicat
...commands.getstatusoutput("cat /etc/services")
status is 0, output is the contents of /etc/services.
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How do I run a shell script without using “sh” or “bash” commands?
... script which I want to run without using the "sh" or "bash" commands. For m>ex m>ample:
11 Answers
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Any way to select without causing locking in MySQL?
...long will this statement take affect? I'm going to use this statement in a m>PHP m> programme,and should be best reset TRANSACTION ISOLATION LEVEL automatically once query finished
– omg
May 27 '09 at 20:17
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How to test if a string is basically an integer in quotes using Ruby
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You can use regular m>ex m>pressions. Here is the function with @janm's suggestions.
class String
def is_i?
!!(self =~ /\A[-+]?[0-9]+\z/)
end
end
An edited version according to comment from @wich:
class String
def is_i?
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How do you manage databases in development, test, and production?
...on is readable also at http://martinfowler.com/articles/evodb.html
In one m>PHP m>+MySQL project I've had the database revision number stored in the database, and when the program connects to the database, it will first check the revision. If the program requires a different revision, it will open a pag...
Makefile, header dependencies
...get for typing from memory. Try it now.
– dmckee --- m>ex m>-moderator kitten
Aug 23 '11 at 21:15
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