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2024年4月29日签到记录贴 - 签到区 - 清泛IT社区，为创新赋能！
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Can't install via pip because of egg_info error
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Found out what was wrong. I never installed the setuptools for python, so it was missing some v...
How do I protect Python code? [closed]
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answered Nov 4 '08 at 12:00
Ned BatchelderNed Batchelder
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Can't connect Nexus 4 to adb: unauthorized
I have a Nexus 4 with Android 4.3 and I am trying to connect the device to a computer with Windows 7 64bit.
26 Answers
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find() with nil when there are no records
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Yes, just do:
Challenge.find_by_id(10)
For Rails 4 and 5:
Challenge.find_by(id: 10)
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python max function using 'key' and lambda expression
... Applying max to a list of tuples.
>>> lis = [(1,'a'), (3,'c'), (4,'e'), (-1,'z')]
By default max will compare the items by the first index. If the first index is the same then it'll compare the second index. As in my example, all items have a unique first index, so you'd get this as the...
How can you use optional parameters in C#?
... at a time when C# did not yet support optional parameters (i.e. before C# 4).
23 Answers
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Is it possible to specify a starting number for an ordered list?
...number to be 6. I found that this was supported (now deprecated) in HTML 4.01. In this specification they say that you can specify the starting integer by using CSS. (instead of the start attribute)
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How do I extract a sub-hash from a hash?
...in other answers, but to sum them in one place:
x = {a: 1, b: 2, c: 3, d: 4}
# => {:a=>1, :b=>2, :c=>3, :d=>4}
x.slice(:a, :b)
# => {:a=>1, :b=>2}
x
# => {:a=>1, :b=>2, :c=>3, :d=>4}
x.except(:a, :b)
# => {:c=>3, :d=>4}
x
# => {:a=>1, :b=>...