可能重复:
我已经注意到,我可以同时使用单引号和双引号来分隔python中的字符串,无论哪一个不是用于分隔字符串,我都可以在其中自由使用,而无需转义它。
示例:
ex1 = 'this works'
ex2 = "this works too"
ex3 = "it's much easier to write it's this way"
ex4 = 'but this way, it\'s possible to print out "quotes from other people"
我正在尝试做这样的事情:
> function gitb(){ git checkout -b $1; alias $1='git checkout $1'; }
> gitb sample
Switched to a new branch 'sample'
> git checkout master
Switched to branch 'master'
> sample
Switched to branch 'sample'
但是,函数gitb的行为并不像预期的那样,因为:
> alias sam
前几天,我在一些遗留代码中遇到了一个SQL注入的机会.
// input: email@email.com"
$email = $_POST['email'];
mysql_query('SELECT * FROM users WHERE email = "'.$email.'" ');
// output: you have an error in your syntax near " ...
// input: email@email.com'
mysql_query("SELECT * FR
我正在用Java编写一个程序,它将读取一个XML文件并进行一些修改,然后以相同的格式编写该文件。
下面是读取和写入XML文件的代码块:
final Document fileDocument = parseFileAsDocument(file);
final OutputFormat format = new OutputFormat(fileDocument);
try {
final FileWriter out = new FileWriter(file);
final XMLSeria