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Django datetime issues (default=datetime.now())
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618
it looks like datetime.now() is being evaluated when the model is defined, and not each time yo...
What's the difference between jquery.js and jquery.min.js?
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11 Answers
11
Active
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Combine two or more columns in a dataframe into a new column with a new name
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132
Use paste.
df$x <- paste(df$n,df$s)
df
# n s b x
# 1 2 aa TRUE 2 aa
# 2 3 bb...
Shell script to send email [duplicate]
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146
Yes it works fine and is commonly used:
$ echo "hello world" | mail -s "a subject" someone@so...
What's the difference between std::move and std::forward
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160
std::move takes an object and allows you to treat it as a temporary (an rvalue). Although it i...
How is performance affected by an unused using directive?
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135
An unused using has no impact to the runtime performance of your application.
It can affect...
What's the proper way to install pip, virtualenv, and distribute for Python?
In my answer to SO question 4314376 , I recommended using ez_setup so that you could then install pip and virtualenv as follows:
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