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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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How Does Modulus Divison Work
... means:
27 / 16 = 1, remainder 11
=> 27 mod 16 = 11
Other examples:
30 / 3 = 10, remainder 0
=> 30 mod 3 = 0
35 / 3 = 11, remainder 2
=> 35 mod 3 = 2
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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 there no xrange function in Python3?
Recently I started using Python3 and it's lack of xrange hurts.
6 Answers
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Simultaneously merge multiple data.frames in a list
...question was marked as a duplicate of this one so I answer here, using the 3 sample data frames below:
x <- data.frame(i = c("a","b","c"), j = 1:3, stringsAsFactors=FALSE)
y <- data.frame(i = c("b","c","d"), k = 4:6, stringsAsFactors=FALSE)
z <- data.frame(i = c("c","d","a"), l = 7:9, stri...
How does zip(*[iter(s)]*n) work in Python?
... arguments for a function call. Therefore you're passing the same iterator 3 times to zip(), and it pulls an item from the iterator each time.
x = iter([1,2,3,4,5,6,7,8,9])
print zip(x, x, x)
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How to round an average to 2 decimal places in PostgreSQL?
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PostgreSQL does not define round(double precision, integer). For reasons @Mike Sherrill 'Cat Rec...
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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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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The difference between bracket [ ] and double bracket [[ ]] for accessing the elements of a list or
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The R Language Definition is handy for answering these types of questions:
http://cran.r-pro...