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Why can I add named properties to an array as if it were an object?
...n it. This should be considered harmful though. Arrays are for numerically indexed data - for non-numeric keys, use an Object.
Here's a more concrete example why non-numeric keys don't "fit" an Array:
var myArray = Array();
myArray['A'] = "Athens";
myArray['B'] = "Berlin";
alert(myArray.length);
...
Hidden features of Python [closed]
...
Wrap an iterable with enumerate and it will yield the item along with its index.
For example:
>>> a = ['a', 'b', 'c', 'd', 'e']
>>> for index, item in enumerate(a): print index, item
...
0 a
1 b
2 c
3 d
4 e
>>>
References:
Python tutorial—looping techniques
Pytho...
How to Load an Assembly to AppDomain with all references recursively?
...creating a new AppDomain, can someone explain?
– Tri Q Tran
Jul 29 '11 at 4:39
2
A MarshalByRefOb...
What does void mean in C, C++, and C#?
... term " void " comes from, and why it is called void. The intention of the question is to assist someone who has no C experience, and is suddenly looking at a C-based codebase.
...
Post-install script with Python setuptools
...
using this solution it seems that install_requires dependencies are ignored
– ealfonso
Jul 31 '18 at 16:56
7
...
再说WCF Data Contract KnownTypeAttribute - 更多技术 - 清泛网移动版 - 专注C/C++及内核技术
...
<parameter type="System.String"/>
<parameter index="0"/>
</parameter>
</knownType>
</add>
</declaredTypes>
</dataContractSerializer>
</system.runtime.serialization>
以上代码就指定了将Circle<Dictionary<string, T>>...
How to write DataFrame to postgres table?
...rt/database')
df.head(0).to_sql('table_name', engine, if_exists='replace',index=False) #truncates the table
conn = engine.raw_connection()
cur = conn.cursor()
output = io.StringIO()
df.to_csv(output, sep='\t', header=False, index=False)
output.seek(0)
contents = output.getvalue()
cur.copy_from(out...
Is it possible to pass a flag to Gulp to have it run tasks in different ways?
...... and ended up with this utility function:
function getArg(key) {
var index = process.argv.indexOf(key);
var next = process.argv[index + 1];
return (index < 0) ? null : (!next || next[0] === "-") ? true : next;
}
It eats an argument-name and will search for this in process.argv. If not...
Sorting a Python list by two fields
...
@MikeAxiak: docs.python.org/2/library/stdtypes.html#index-29 states in comment 9: Starting with Python 2.3, the sort() method is guaranteed to be stable. A sort is stable if it guarantees not to change the relative order of elements that compare equal — this is helpful for s...
Copy table without copying data
...
Try
CREATE TABLE foo LIKE bar;
so the keys and indexes are copied over as, well.
Documentation
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