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How to select rows from a DataFrame based on column values?
...it is more efficient to
make an index first, and then use df.loc:
df = df.set_index(['B'])
print(df.loc['one'])
yields
A C D
B
one foo 0 0
one bar 1 2
one foo 6 12
or, to include multiple values from the index use df.index.isin:
df.loc[df.index.isin(['one','...
How to make vi redraw screen?
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control+L seems does not work for me; I have to reset terminal first. not know why....
– Sam Liao
Jul 13 '09 at 4:48
7
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CROSS JOIN vs INNER JOIN in SQL
...lues, it's wrong; for rows as elements they can't be shared. For tables as sets you don't need a Venn diagram. Figure 1 is a common terrible attempt to explain JOIN. Its key is also complex: It's only for tables as sets & only equijoin & only one value; it also represents the input different...
How to redirect cin and cout to files?
...file out.txt
f(); //call function
std::cin.rdbuf(cinbuf); //reset to standard input again
std::cout.rdbuf(coutbuf); //reset to standard output again
std::cin >> word; //input from the standard input
std::cout << word; //output to the standard input
}
You co...
What is the difference between JOIN and JOIN FETCH when using JPA and Hibernate
...is because your mapping between Employee and Department (a @OneToMany) are setted with FetchType.EAGER. In this case, any HQL (with fetch or not) query with FROM Employee will bring all Departments. Remember that all mapping *ToOne (@ManyToOne and @OneToOne) are EAGER by default.
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Can you use hash navigation without affecting history?
...otcha when you're on a page with a path fragment and don't realize base is set.
– Tyler Kasten
Jun 8 '17 at 23:05
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How do I set the UI language in vim?
...ws the UI in German . Damn you, vim! I want English , but since my OS is set up in German (the standard at our office), I guess vim is actually trying to be helpfull.
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How do I convert a string to a lower case representation?
... I want to compare user input, which are unicode strings, against a stored set of unicode strings and find matches, after lowercasing both sets. would u need tolowerspecial() is this case?
– Luke W
Apr 1 '17 at 17:15
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How do I include a path to libraries in g++
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In your MakeFile or CMakeLists.txt you can set CMAKE_CXX_FLAGS as below:
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -I/path/to/your/folder")
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完美解决phpcms批量移动内容后，新闻心情、评论排行等不更新的问题 - 更多...
...章
*/
public function remove() {
if(isset($_POST['dosubmit'])) {
$this->content_check_db = pc_base::load_model('content_check_model');
$this->hits_db = pc_base::load_model('hits_model');
$...