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__attribute__ - C/C++ - 清泛网 - 专注C/C++及内核技术
...一个带有可变参数的函数，其功能类似于printf：
//m=1；n=2
extern void myprint(const char *format,...) __attribute__((format(printf,1,2)));
//m=2；n=3
extern void myprint(int l，const char *format,...)
__attribute__((format(printf,2,3)));
需要特别注意的是，如果my...
What is the use of the ArraySegment class?
...l array, get the first item, and so on:
var array = new byte[] { 5, 8, 9, 20, 70, 44, 2, 4 };
array.Dump();
var segment = new ArraySegment<byte>(array, 2, 3);
segment.Dump(); // output: 9, 20, 70
segment.Reverse().Dump(); // output 70, 20, 9
segment.Any(s => s == 99).Dump(); // output fals...
Pandas DataFrame Groupby two columns and get counts
...
126
Followed by @Andy's answer, you can do following to solve your second question:
In [56]: df.gr...
CALayer with transparent hole in it
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219
I was able to solve this with Jon Steinmetz suggestion. If any one cares, here's the final sol...
What exactly do “u” and “r” string flags do, and what are raw string literals?
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702
There's not really any "raw string"; there are raw string literals, which are exactly the string...
How to remove all leading zeroes in a string
...
answered Feb 23 '11 at 23:36
lonesomedaylonesomeday
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Convert a PHP object to an associative array
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32 Answers
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How do I find where an exception was thrown in C++?
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72
Here's some info that may be of use in debugging your problem
If an exception is uncaught, the s...
cartesian product in pandas
...rom pandas import DataFrame, merge
df1 = DataFrame({'key':[1,1], 'col1':[1,2],'col2':[3,4]})
df2 = DataFrame({'key':[1,1], 'col3':[5,6]})
merge(df1, df2,on='key')[['col1', 'col2', 'col3']]
Output:
col1 col2 col3
0 1 3 5
1 1 3 6
2 2 4 5
3 2 4 6...