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Are list-comprehensions and functional functions faster than “for loops”?
In terms of performance in Python, is a list-comprehension, or functions like map() , filter() and reduce() faster than a for loop? Why, technically, they run in a C speed , while the for loop runs in the python virtual machine speed ?.
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How to use a decimal range() step value?
Is there a way to step between 0 and 1 by 0.1?
33 Answers
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Linear Regression and group by in R
I want to do a linear regression in R using the lm() function. My data is an annual time series with one field for year (22 years) and another for state (50 states). I want to fit a regression for each state so that at the end I have a vector of lm responses. I can imagine doing for loop for each ...
How does the Brainfuck Hello World actually work?
Someone sent this to me and claimed it is a hello world in Brainfuck (and I hope so...)
6 Answers
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How can I profile C++ code running on Linux?
I have a C++ application, running on Linux, which I'm in the process of optimizing. How can I pinpoint which areas of my code are running slowly?
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How to change the order of DataFrame columns?
I have the following DataFrame ( df ):
34 Answers
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What is the difference between NULL, '\0' and 0?
In C, there appear to be differences between various values of zero -- NULL , NUL and 0 .
11 Answers
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Convert floats to ints in Pandas?
I've been working with data imported from a CSV. Pandas changed some columns to float, so now the numbers in these columns get displayed as floating points! However, I need them to be displayed as integers, or, without comma. Is there a way to convert them to integers or not display the comma?
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C#位运算符（C#按位与、按位或 等） - 更多技术 - 清泛网 - 专注C/C++及内核技术
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整型，字符型
整型
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~a
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位逻辑与运算
2
a & b
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位逻辑或运算
2
a | b
^
位逻辑异或运算
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a ^ b
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Convert tuple to list and back
I'm currently working on a map editor for a game in pygame, using tile maps.
The level is built up out of blocks in the following structure (though much larger):
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