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Remove all occurrences of a value from a list?
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23 Answers
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Lua简明教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...行lua命令后进入lua的shell中执行语句。
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chenhao-air:lua chenhao$ lua
Lua 5.2.2 Copyright (C) 1994-2013 Lua.org, PUC-Rio
> print("Hello, World")
Hello, World
>
也可以把脚本存成一个文件，用如下命令...
How to apply a function to two columns of Pandas dataframe
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Here's an example using apply on the dataframe, which I am calling with axis = 1.
Note the d...
Filter rows which contain a certain string
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The answer to the question was already posted by the @latemail in the comments above. You can us...
Index all *except* one item in python
...you could use a list comp. For example, to make b a copy of a without the 3rd element:
a = range(10)[::-1] # [9, 8, 7, 6, 5, 4, 3, 2, 1, 0]
b = [x for i,x in enumerate(a) if i!=3] # [9, 8, 7, 5, 4, 3, 2, 1, 0]
This is very general, and can be used with all iterables, incl...
Difference between Math.Floor() and Math.Truncate()
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edited May 23 '17 at 12:03
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answered Aug 1 '08 at 12:26
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Average of 3 long integers
I have 3 very large signed integers.
12 Answers
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How to initialize an array in one step using Ruby?
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You can use an array literal:
array = [ '1', '2', '3' ]
You can also use a range:
array = ('1'..'3').to_a # parentheses are required
# or
array = *('1'..'3') # parentheses not required, but included for clarity
For arrays of whitespace-delimited strings, you can us...
How to drop columns by name in a data frame
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You should use either indexing or the subset function. For example :
R> df <- data.fram...
Zip lists in Python
...ch tuple contains, you could examine the length of the first element:
In [3]: result = zip(a, b, c)
In [4]: len(result[0])
Out[4]: 3
Of course, this won't work if the lists were empty to start with.
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