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How to filter Pandas dataframe using 'in' and 'not in' like in SQL
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You can use pd.Series.isin.
For "IN" use: something.isin(somewhere)
Or for "NOT IN": ~something....
Return a value if no rows are found in Microsoft tSQL
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How to reorder data.table columns (without copying)
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Use setcolorder():
library(data.table)
x <- data.table(a = 1:3, b = 3:1, c = runif(3))
x
#...
Most efficient method to groupby on an array of objects
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Convert a list to a dictionary in Python
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Fastest way to replace NAs in a large data.table
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What's the difference between “mod” and “remainder”?
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There is a difference between modulus and remainder. For example:
-21 mod 4 is 3 because -21 ...
SVN needs-lock 设置强制只读属性（官方资料） - 环境配置 - 清泛IT论坛，...
...fore versioning of binary files should follow the lock-modify-unlock model[1]. This setup uses the following three measuresforces users to use property svn:needs-lock on newly added binary files. Denies commits when the property is not available
sets the svn:needs-lock property on all already ex...
Iterate a list as pair (current, next) in Python
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