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Convert string to variable name in python [duplicate]
...
x='buffalo'
exec("%s = %d" % (x,2))
After that you can check it by:
print buffalo
As an output you will see:
2
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%d,%c,%s,%x等转换符 释义 - C/C++ - 清泛网 - 专注C/C++及内核技术
%d,%c,%s,%x等转换符 释义转换说明符 %a(%A) 浮点数、十六进制数字和p-(P-)记数法(C99) %c 字符 %d 有符号十进制整数 %f 浮...转换说明符
%a(%A) 浮点数、十六进制数字和p-(P-)记数法(C99)
%c 字符
%d ...
关于 __VA_ARGS__ 宽字符版本的问题 - C/C++ - 清泛网 - 专注C/C++及内核技术
...日志函数，考虑到宽字符（Unicode版本）时：#define WIDEN2(x) L ## x#define WIDEN(x) WIDEN2(x)#define __...在写一个可变参数的记录日志函数，考虑到宽字符（Unicode版本）时：
#define WIDEN2(x) L ## x
#define WIDEN(x) WIDEN2(x)
#define __WFILE__ WIDEN(__FI...
正则表达式中 /i,/g,/m,/s,/e,/x 的含义 - 更多技术 - 清泛网 - 专注C/C++及内核技术
正则表达式中 /i,/g,/m,/s,/e,/x 的含义正则表达式中 i, g, m, s, e, x的区别和含义 i (忽略大小写) g (全文查找出现的所有匹配字符) m (多行查找) gi(全文查找、忽略大小写) ig...正则表达式中 /i,/g,/m,/x,/e,/x 的含义：
/i (忽略大小写)
/g (...
Undefined reference to symbol X509_free - C/C++ - 清泛网 - 专注C/C++及内核技术
Undefined reference to symbol X509_freeundefined-reference-to-symbol-x509-freeUndefined reference to symbol X509_free 编译错误的解决方法：链接库中增加 -lcrypto，而非 -lcrypt参考：https: stackoverflow com questions 33215936 undefined-reference-to-symbol-x509-freeUndefined refer...
What is “point free” style (in Functional Programming)?
...mbinators and function composition [...] instead of variables.
Haskell example:
Conventional (you specify the arguments explicitly):
sum (x:xs) = x + (sum xs)
sum [] = 0
Point-free (sum doesn't have any explicit arguments - it's just a fold with + starting with 0):
sum = foldr (+) 0
Or ev...
Remove all elements contained in another array
... method:
myArray = myArray.filter( function( el ) {
return toRemove.indexOf( el ) < 0;
} );
Small improvement, as browser support for Array.includes() has increased:
myArray = myArray.filter( function( el ) {
return !toRemove.includes( el );
} );
Next adaptation using arrow function...
Which @NotNull Java annotation should I use?
...tion and/or static code analysis (FindBugs and Sonar) to avoid NullPointerExceptions. Many of the tools seem incompatible with each others' @NotNull / @NonNull / @Nonnull annotation and listing all of them in my code would be terrible to read. Any suggestions of which one is the 'best'? Here is...
What is the difference between a var and val definition in Scala?
...a var can. However, said object can have its internal state modified. For example:
class A(n: Int) {
var value = n
}
class B(n: Int) {
val value = new A(n)
}
object Test {
def main(args: Array[String]) {
val x = new B(5)
x = new B(6) // Doesn't work, because I can't replace the obje...
Why is Python 3.x's super() magic?
In Python 3.x, super() can be called without arguments:
1 Answer
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