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How to find list intersection?
actual output: [1,3,5,6]
expected output: [1,3,5]
11 Answers
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Base64 length calculation?
...log2(64) = 6).
Therefore 4 chars are used to represent 4 * 6 = 24 bits = 3 bytes.
So you need 4*(n/3) chars to represent n bytes, and this needs to be rounded up to a multiple of 4.
The number of unused padding chars resulting from the rounding up to a multiple of 4 will obviously be 0, 1, 2 or...
How to delete multiple values from a vector?
...vector like: a = c(1:10) and I need to remove multiple values, like: 2, 3, 5
8 Answers
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When is “i += x” different from “i = i + x” in Python?
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3 Answers
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Removing duplicates from a list of lists
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>>> k = [[1, 2], [4], [5, 6, 2], [1, 2], [3], [4]]
>>> import itertools
>>> k.sort()
>>> list(k for k,_ in itertools.groupby(k))
[[1, 2], [3], [4], [5, 6, 2]]
itertools often offers the fastest and most powerful solutions to this kind of ...
Why is [1,2] + [3,4] = “1,23,4” in JavaScript?
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13 Answers
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How to round an average to 2 decimal places in PostgreSQL?
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283
PostgreSQL does not define round(double precision, integer). For reasons @Mike Sherrill 'Cat Rec...
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 can I get the concatenation of two lists in Python without modifying either one? [duplicate]
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edited Mar 10 at 13:01
phoenix
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answered D...
How to deal with SettingWithCopyWarning in Pandas?
I just upgraded my Pandas from 0.11 to 0.13.0rc1. Now, the application is popping out many new warnings. One of them like this:
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