英文文档: class str(object='') class str(object=b'', encoding='utf-8', errors='strict') Return a string version of object. If object is not provided, returns the empty string. Otherwise, the behavior of str()depends on whether encoding or errors is given
str内部功能详解: class str(object): """ str(object='') -> str str(bytes_or_buffer[, encoding[, errors]]) -> str Create a new string object from the given object. If encoding or errors is specified, then the object must expose a data buffer
bool值之间的转换 and 空字符串即为False 字符串内有内容即为True. a = 11 c = str(a) #int转换成str print(type(c)) a = ' b = int(a) # str转换成int print(type(b)) a = '' # 空字符串为False print(bool(a)) b = ' ' #字符串内有内容即为True print(bool(b)) str的常见功能(***重要) **capitalize capitalize() s =
模拟实现兼容低版本IE浏览器的原生bind()函数功能: 代码如下: if(!Function.prototype.bind){ Function.prototype.bind=function(oThis){ if (typeof this !== 'function'){ throw new TypeError('调用者不是当前函数对象'); } var aArgs = Array.prototype.slice.call(arguments,
Implement strstr() 实现strstr函数功能 whowhoha@outlook.com Question: Implement strstr(). Returns the index of the first occurrence of needle in haystack, or –1 if needle is not part of haystack. int strStr(string haystack, string needle) { for (int i = 0;
输入 show variables like '%func%'; 命令 会看到 log_bin_trust_function_creators 的状态,如果是OFF表示自定义函数功能是关闭的 输入命令 set global log_bin_trust_function_creators=1; 可将 log_bin_trust_function_creators 开启自定义函数功能 但是这样设置是一个临时的方案,因为mysql自动重启后状态又会变为OFF,所以需要在 在服务启动时加上 “--log
应用 MySQL 时,会遇到不能创建函数的情况.出现如下错误信息: ERROR 1418 : This function has none of DETERMINISTIC, NO SQL, or READS SQL DATA in its declaration and binary logging is enabled (you *might* want to use the less safe log_bin_trust_function_creators variable) 那是因为没有