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java: Class.isInstance vs Class.isAssignableFrom
Let clazz be some Class and obj be some Object .
4 Answers
4
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How do I merge two dictionaries in a single expression in Python (taking union of dictionaries)?
...dictionaries, merged (i.e. taking the union). The update() method would be what I need, if it returned its result instead of modifying a dictionary in-place.
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Undefined behavior and sequence points
...ndard do not formally contain 'sequence points'; operations are 'sequenced before' or 'unsequenced' or 'indeterminately sequenced' instead. The net effect is essentially the same, but the terminology is different.
Disclaimer : Okay. This answer is a bit long. So have patience while reading it. I...
How to run only one local test class on Gradle
I am new to Gradle. I use Gradle 1.10 and Ubuntu 13.
9 Answers
9
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Should I instantiate instance variables on declaration or in the constructor?
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There is no difference - the instance variable initialization is actually put in the constructor(s) by the compiler.
The first variant is more readable.
You can't have exception handling with the first variant.
There is additionally the initialization block, which is ...
Selecting/excluding sets of columns in pandas [duplicate]
I would like to create views or dataframes from an existing dataframe based on column selections.
9 Answers
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How do I 'overwrite', rather than 'merge', a branch on another branch in Git?
I have two branches, email and staging . staging is the latest one and I no longer need the old changes in email branch, yet I don't want to delete them.
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Create a “with” block on several context managers? [duplicate]
Suppose you have three objects you acquire via context manager, for instance A lock, a db connection and an ip socket.
You can acquire them by:
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lua和c/c++互相调用实例分析 - C/C++ - 清泛网 - 专注C/C++及内核技术
...入"栈"接口：
void (lua_pushnil) (lua_State *L);
void (lua_pushnumber) (lua_State *L, lua_Number n);
void (lua_pushinteger) (lua_State *L, lua_Integer n);
void (lua_pushlstring) (lua_State *L, const char *s, size_t l);
void (lua_pushstring) (lua_State *L, const char *s);
void (lua_pu...
Why does one use dependency injection?
...; I hardly write virtual functions and interfaces (although I do once in a blue moon) and all my configuration is magically serialized into a class using json.net (sometimes using an XML serializer).
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