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What is the difference between LINQ ToDictionary and ToLookup
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ToDictionary is <TKey, TValue> while ToLookup<TKey, T1, T2, T3, ...> is is similar to IGrouping but enumeration stays in memory.
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How to toggle a value in Python
...usec/pass" % (1000000 * t2.timeit(number=100000)/100000)
6.19 usec/pass
stmt3="""
toggle = False
for i in xrange(0,100):
toggle = (not toggle) & 1
"""
>>> t3=timeit.Timer(stmt=stmt3)
>>> print "%.2f usec/pass" % (1000000 * t3.timeit(number=100000)/100000)
9.84 usec/pass
>...
Print all but the first three columns
... even preserve trailing spaces from original string)
$ echo -e ' 1 2\t \t3 4 5 6 7 \t 8\t ' |
awk -v n=3 '{ for ( i=1; i<=n; i++) { sub("^["FS"]*[^"FS"]+["FS"]+","",$0);} } 1 ' |
sed 's/ /./g;s/\t/->/g;s/^/"/;s/$/"/'
"4...5...6.7.->.8->."
$ echo -e ' 1 2\t \t3 4 5...
Accessing nested JavaScript objects and arays by string path
...n;
}
}
return o;
}
Usage::
Object.byString(someObj, 'part3[0].name');
See a working demo at http://jsfiddle.net/alnitak/hEsys/
EDIT some have noticed that this code will throw an error if passed a string where the left-most indexes don't correspond to a correctly nested entry ...
C＋＋模板的特化 - C/C++ - 清泛网 - 专注C/C++及内核技术
...s X<vector<double>, int&> {};
template<typename T1, typename T2, typename T3>
class X<map<T1,T2>, T3&> {};
最后，还有一种超级牛X的，在tr1里面用以实现function的，以前我都没见过还可以这么玩的：
template<typename T>
class Y;//这是在声明一个类模板，既...
Access denied for user 'root'@'localhost' while attempting to grant privileges. How do I grant privi
... GRANT OPTION
...but still not allowed to create a table:
create table t3(id int, txt varchar(50), primary key(id));
ERROR 1142 (42000): CREATE command denied to user 'root'@'localhost' for table 't3'
Well, it was cause by an annoying user error, i.e. I didn't select a database.
After issuing ...
Undo a Git merge that hasn't been pushed yet
...nswer - note the difference). Let's say, on master, I did 3 commits at t1, t3, and t5. Let's say, on branch1, I did 3 comments at t2, t4 and t6 (assume t1, t2, t3, t4, t5 and t6 are in chronological order). Any command similar to git reset --hard HEAD~5 will only reset HEAD (may remove commits in bo...
Func with out parameter
...ass Result
{
public IList<Foo> List { get; set; }
public Int32 Count { get; set; }
}
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String concatenation vs. string substitution in Python
...> so_q_tmp(1000)
'http://stackoverflow.com/questions/1000'
>>> t3= timeit.Timer('so_q_tmp(1000)','from __main__ import so_q_tmp')
>>> t3.timeit(number=10000000)
14.564135316080637
>>> def so_q_join(n):
... return ''.join([DOMAIN,QUESTIONS,'/',str(n)])
...
>>>...
Copy all files with a certain extension from all subdirectories
... It does NOT preserver subdirs.
– b005t3r
Mar 26 '18 at 10:54
3
@b005t3r that is b...