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Why does base64 encoding require padding if the input length is not divisible by 3?
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Aggregate / summarize multiple variables per group (e.g. sum, mean)
...~ variable, sum)
# year month x1 x2
1 2000 1 -80.83405 -224.9540159
2 2000 2 -223.76331 -288.2418017
3 2000 3 -188.83930 -481.5601913
4 2000 4 -197.47797 -473.7137420
5 2000 5 -259.07928 -372.4563522
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Best GUI designer for eclipse? [closed]
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edited Jun 10 '12 at 23:23
Andrew Marshall
87.3k1818 gold badges202202 silver badges204204 bronze badges
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Why do objects of the same class have access to each other's private data?
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edited Aug 3 '11 at 3:31
answered Aug 3 '11 at 3:26
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How do I exchange keys with values in a dictionary?
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Python 2:
res = dict((v,k) for k,v in a.iteritems())
Python 3 (thanks to @erik):
res = dict((v,k) for k,v in a.items())
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How to upgrade PowerShell version from 2.0 to 3.0
...t is installed here is 2.0. Is it possible for me to upgrade it to version 3.0 or 4.0?
7 Answers
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App Inventor 2 列表积木完全指南：从入门到精通，一篇搞定数据存储 - App...
...、布尔值（是否会员），取出来时保持原类型不变。
3. 追加列表项
使用 追加列表项 积木，将新元素添加到列表末尾。同样是块扩展积木，点击齿轮可以一次添加多项。
追加列表项 到 global colors: "黄"复制代码
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How to use glyphicons in bootstrap 3.0
I have already used glyphicons in bootstrap 2.3 but now I have upgraded to bootstrap 3.0. Now, I am unable to use the icon property.
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pandas: How do I split text in a column into multiple rows?
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This splits the Seatblocks by space and gives each its own row.
In [43]: df
Out[43]:
CustNum CustomerName ItemQty Item Seatblocks ItemExt
0 32363 McCartney, Paul 3 F04 2:218:10:4,6 60
1 31316 Lennon, John 25 F01 1:13:36:1...