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ROW_NUMBER() in MySQL

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App Inventor 2 DynamicComponents 拓展:动态创建AI2组件对象 · App Inventor 2 中文网

...反馈 App Inventor 2 DynamicComponents 拓展:动态创建AI2组件对象 DynamicComponents 拓展 FAQ 基准测试结果 « 返回首页 DynamicComponents 拓展 .aix 拓展下载: co...
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How to return 2 values from a Java method?

I am trying to return 2 values from a Java method but I get these errors. Here is my code: 14 Answers ...
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Creating a custom JButton in Java

... | edited Oct 27 '16 at 7:19 Lahiru Ashan 61288 silver badges1414 bronze badges answered Aug...
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Batch renaming files with Bash

... 192 You could use bash's parameter expansion feature for i in ./*.pkg ; do mv "$i" "${i/-[0-9.]*.pk...
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How to filter Pandas dataframe using 'in' and 'not in' like in SQL

...le: import pandas as pd >>> df country 0 US 1 UK 2 Germany 3 China >>> countries_to_keep ['UK', 'China'] >>> df.country.isin(countries_to_keep) 0 False 1 True 2 False 3 True Name: country, dtype: bool >>> df[df.country.isin(cou...
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Combine two or more columns in a dataframe into a new column with a new name

... 132 Use paste. df$x <- paste(df$n,df$s) df # n s b x # 1 2 aa TRUE 2 aa # 2 3 bb F...
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How to limit depth for recursive file list?

... | edited Dec 22 '10 at 13:39 answered Dec 22 '10 at 13:31 ...
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Why can't I use a list as a dict key in python?

...uality. Many would - understandably - expect that you can use any list [1, 2] to get the same key, where you'd have to keep around exactly the same list object. But lookup by value breaks as soon as a list used as key is modified, and for lookup by identity requires you to keep around exactly the sa...
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Rank items in an array using Python/NumPy, without sorting array twice

...se slicing on the left-hand side in the last step: array = numpy.array([4,2,7,1]) temp = array.argsort() ranks = numpy.empty_like(temp) ranks[temp] = numpy.arange(len(array)) This avoids sorting twice by inverting the permutation in the last step. ...