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Mysql substr和Oracle substr区别 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
Mysql substr和Oracle substr区别Oracle substr(字符串，开始索引、从0起，长度)Mysql substr或substring(字符串，开始索引、从1起，长度)Oracle substr(字符串，开始索引、从0起，长度)
Mysql substr或substring(字符串，开始索引、从1起，长度)Mysql Orac...
For every character in string
...abcde";
int len = strlen(str);
for (int i = 0; i < len; i++)
{
char chr = str[i];
//do something....
}
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安卓App可以实现从其他App的目录中拷贝文件吗？ - App应用开发 - 清泛IT社...
先说结论：不可以，因为安卓的核心安全机制（沙箱机制）禁止访问其他app的私有目录。
例外：
1、取得了root权限。
2、公共目录可以，比如相册目录、/sdcard 目录等。
3、如果其他应用通过 ContentProvider 或 FileProvider 显式共...
Iterating each character in a string using Python
...re, to increment each character value:
>>> ''.join(map(lambda x: chr(ord(x)+1), "HAL"))
'IBM'
or more generally:
>>> ''.join(map(my_function, my_string))
where my_function takes a char value and returns a char value.
...
Useful code which uses reduce()? [closed]
...
I think reduce is a silly command. Hence:
reduce(lambda hold,next:hold+chr(((ord(next.upper())-65)+13)%26+65),'znlorabggbbhfrshy','')
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未能从“const std::string”为“const std::_Tree<_Traits> &”...
http://blog.csdn.net/mfcing/article/details/44157227
windbg 备忘 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...
.frame frame_number
Windbg查看全局变量:
a.直接把鼠标移动到全局变量上,就能显示值了.
b.watch窗口里面,把那个全局变量输进去.
入侵模式调试
在默认情况下，当我们用CDB调试一个已经运行的进程时，它通常作为全功能的调试器...
Replace all 0 values to NA
... 4 x 4
col1 col2 col3 col4
<dbl> <dbl> <dbl> <chr>
1 1 NA 1 a
2 2 2 NA b
3 3 3 3 c
4 NA 4 NA d
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Filter dict to contain only certain keys?
...st in Python 2.7.6, with a dictionary of 26 items (timeit(..., setup="d = {chr(x+97):x+1 for x in range(26)}")), depending on how many items are being filtered out (filtering out consonant keys is faster than filtering out vowel keys because you're looking up fewer items). The difference in performa...
Why doesn't this code simply print letters A to Z?
... answered Nov 4 '10 at 15:42
Christian C. SalvadóChristian C. Salvadó
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