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C++ sorting and keeping track of indexes
...; // std::iota
#include <algorithm> // std::sort, std::stable_sort
using namespace std;
template <typename T>
vector<size_t> sort_indexes(const vector<T> &v) {
// initialize original index locations
vector<size_t> idx(v.size());
iota(idx.begin(), id...
Importing a CSV file into a sqlite3 database table using Python
...csv, sqlite3
con = sqlite3.connect(":memory:") # change to 'sqlite:///your_filename.db'
cur = con.cursor()
cur.execute("CREATE TABLE t (col1, col2);") # use your column names here
with open('data.csv','r') as fin: # `with` statement available in 2.5+
# csv.DictReader uses first line in file fo...
Class with Object as a parameter
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DevrajDevraj
2,8092020 silver badges2323 bronze badges
3
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Any reason why scala does not explicitly support dependent types?
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@ashy_32bit if you can get access to "Advanced Topics in Types and Programming Languages" by Benjamin Pierce, there is a chapter in that which gives a reasonable introduction to dependent types. You could also read some papers by C...
Vim: insert the same characters across multiple lines
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answered Mar 5 '12 at 16:32
danpricedanprice
78444 silver badges33 bronze badges
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Python string.join(list) on object array rather than string array
...e comment.
– S.Lott
Jan 31 '09 at 2:32
2
(another) +1.. map is not less readable, just need to kn...
How do you use gcc to generate assembly code in Intel syntax?
... Clang cannot currently consume Intel syntax. See LLVM Bug 24232: [X86] Inline assembly operands don't work with .intel_syntax. Also, Clang ignores prefix/noprefix (not sure if it matters if Clang consumes the assembly).
– jww
Sep 26 '15 at 22:34
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How do I get the function name inside a function in PHP?
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Yasin Patel
4,21855 gold badges2323 silver badges4343 bronze badges
answered Apr 2 '18 at 9:06
Snehal KSnehal K
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Delete column from pandas DataFrame
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As you've guessed, the right syntax is
del df['column_name']
It's difficult to make del df.column_name work simply as the result of syntactic limitations in Python. del df[name] gets translated to df.__delitem__(name) under the covers by Python.
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STL中map容器使用自定义key类型报错详解 - C/C++ - 清泛网 - 专注C/C++及内核技术
...定义一个结构体来试试：[cpp]view plaincopystructa{char*pName;intm_a;} 引言
STL的map容器中，key的类型是不是随意的呢？
实践
编写测试代码
定义一个结构体来试试：
struct a
{
char* pName;
int m_a;
};
...
map<a, int> mp;
a ...