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Is there any difference between “foo is None” and “foo == None”?
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And you may want to add that the is operator cannot be customized (overloaded by a user-defined class).
– martineau
Dec 17 '10 at 20:28
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How to find elements by class
... because then stylelistrow2 will match. Better comment is "why not use string.find() instead of re?"
– FlipMcF
Mar 5 '15 at 11:52
2
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Foreign Key to non-primary key
I have a table which holds data, and one of those rows needs to exist in another table. So, I want a foreign key to maintain referential integrity.
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How to test code dependent on environment variables using JUnit?
...onmentVariablesTest {
@Test
public void setEnvironmentVariable() {
String value = withEnvironmentVariable("name", "value")
.execute(() -> System.getenv("name"));
assertEquals("value", value);
}
}
For Java 5 to 7 the library System Rules has a JUnit rule called EnvironmentVari...
Split string, convert ToList() in one line
I have a string that has numbers
10 Answers
10
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how to convert a string date into datetime format in python? [duplicate]
How do I convert a a string of datetime into datetime format in python so that it can be compared with another date?
2 Answ...
MFC CString与std::string互转 - C/C++ - 清泛网 - 专注C/C++及内核技术
MFC CString与std::string互转CString cstr;std::string stdstr;非Unicode：stdstr.assign( (LPSTR) (LPCTSTR) cstr); 或者 stdstr = std::string( (LPSTR) (...CString cstr;
std::string stdstr;
非Unicode：
stdstr.assign( (LPSTR) (LPCTSTR) cstr); 或者 stdstr = std::string( (LPSTR) (LPCTSTR)...
QUERY_STRING、REQUEST_URI、SCRIPT_NAME、PHP_SELF区别 - 更多技术 - 清泛...
QUERY_STRING、REQUEST_URI、SCRIPT_NAME、PHP_SELF区别通过实例说明PHP中QUERY_STRING、REQUEST_URI、SCRIPT_NAME、PHP_SELF区别。实例：
1、http://localhost/aaa/ （打开aaa中的index.php）
$_SERVER['QUERY_STRING'] = "";
$_SERVER['REQUEST_URI'] = "/aaa/";
$_SERVER['SCRIPT_NAME...
实例演示SimpleXMLElement的用法 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...示SimpleXMLElement的用法使用PHP解析XML时，常用simplexml_load_string，缺省是一个SimpleXMLElement的包装函数，今天不说simplexml_load_string，只说SimpleXMLEle...使用PHP解析XML时，常用simplexml_load_string，缺省是一个SimpleXMLElement的包装函数，今天不...
Find object in list that has attribute equal to some value (that meets any condition)
... None)
This gets the first item from the list that matches the condition, and returns None if no item matches. It's my preferred single-expression form.
However,
for x in test_list:
if x.value == value:
print("i found it!")
break
The naive loop-break version, is perfectly Pytho...