大约有 47,000 项符合查询结果（耗时：0.0517秒） [XML]
To find whether a column exists in data frame or not
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answered Apr 23 '12 at 7:03
user554546user554546
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Defining an array of anonymous objects in CoffeeScript
...kes sense here.
– Jameson Quinn
Dec 3 '12 at 3:04
18
Check out my answer -- this is perfectly doa...
Rails ActiveRecord date between
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Just a note that the currently accepted answer is deprecated in Rails 3. You should do this instead:
Comment.where(:created_at => @selected_date.beginning_of_day..@selected_date.end_of_day)
Or, if you want to or have to use pure string conditions, you can do:
Comment.where('created_at BE...
The Ruby %r{ } expression
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Matthew
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answered Sep 12 '12 at 9:10
EurekaEureka
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Finding # occurrences of a character in a string in Ruby
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3 Answers
3
Active
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Push git commits & tags simultaneously
...eight tag, which would not be pushed, as I mentioned here)
Update April 2013
Since git 1.8.3 (April 22d, 2013), you no longer have to do 2 commands to push branches, and then to push tags:
The new "--follow-tags" option tells "git push" to push relevant annotated tags when pushing branches out.
Yo...
What is the most efficient way of finding all the factors of a number in Python?
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Ry-♦
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answered Jul 23 '11 at 12:04
agfagf
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Are 2^n and n*2^n in the same time complexity?
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232
You will have to go to the formal definition of the big O (O) in order to answer this question....
Unnamed/anonymous namespaces vs. static functions
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339
The C++ Standard reads in section 7.3.1.1 Unnamed namespaces, paragraph 2:
The use of the...