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List comprehension vs map
...n map needs a lambda:
$ python -mtimeit -s'xs=range(10)' 'map(lambda x: x+2, xs)'
100000 loops, best of 3: 4.24 usec per loop
$ python -mtimeit -s'xs=range(10)' '[x+2 for x in xs]'
100000 loops, best of 3: 2.32 usec per loop
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How to change Vagrant 'default' machine name?
... to test all of them to see exactly what they do.
I'm using VirtualBox 4.2.16-r86992 and Vagrant 1.3.3.
I created a directory called nametest and ran
vagrant init precise64 http://files.vagrantup.com/precise64.box
to generate a default Vagrantfile. Then I opened the VirtualBox GUI so I could...
How to create empty text file from a batch file?
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echo. 2>EmptyFile.txt
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What's with 181783497276652981 and 8682522807148012 in Random (Java 7)?
Why were 181783497276652981 and 8682522807148012 chosen in Random.java ?
3 Answers
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Determining if a number is either a multiple of ten or within a particular set of ranges
...== 0) // It's divisible by 10
For the second one:
if(((num - 1) / 10) % 2 == 1 && num <= 100)
But that's rather dense, and you might be better off just listing the options explicitly.
Now that you've given a better idea of what you are doing, I'd write the second one as:
int ge...
Passing an array to a function with variable number of args in Swift
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edited Dec 26 '17 at 14:27
Hasaan Ali
7951010 silver badges1818 bronze badges
answered Ju...
How do I raise the same Exception with a custom message in Python?
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12 Answers
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The 'json' native gem requires installed build tools
I have ruby 1.9.2p180 (2011-02-18) [i386-mingw32] installed on my windows 7 machine. Now I tried to install the JSON gem using the command, "gem install json" and got the following error.
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App Inventor 2 字典 vs 列表：同样存数据，性能差了10倍？ - App应用开发 ...
<font size="4"><b>App Inventor 2 字典 vs 列表：同样存数据，性能差了10倍？</b></font><br><br><br>在做 App 开发时，你可能会遇到这样一个场景：要存储一组学生信息，包含姓名、年龄、班级，然后需要快速根据姓名查到对应的班级。用列...
GoTo Next Iteration in For Loop in java
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352
continue;
continue; key word would start the next iteration upon invocation
For Example
for...