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Removing multiple keys from a dictionary safely
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def entries_to_remove(entries, the_dict):
for key in entries:
if key in the_dict:
del the_dict[key]
A more compact version was provided by mattbornski using dict.pop()
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What is the difference between old style and new style classes in Python?
What is the difference between old style and new style classes in Python? When should I use one or the other?
8 Answers
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Why does Python code use len() function instead of a length method?
...eople to implement .len(). Its the same thing, and one looks much cleaner. If the language is going to have an OOP __len__, what in the world is the point of making len(..)
– alternative
Nov 7 '11 at 21:13
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What is the best way to call a script from another script?
...ollowing.
test1.py
def some_func():
print 'in test 1, unproductive'
if __name__ == '__main__':
# test1.py executed as script
# do something
some_func()
service.py
import test1
def service_func():
print 'service func'
if __name__ == '__main__':
# service.py executed as...
Installing SciPy and NumPy using pip
...ns you linked in Installing SciPy have been removed, might be linking here now scipy.org/scipylib/building/windows.html
– jxramos
Aug 11 '15 at 20:52
30
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How to include PHP files that require an absolute path?
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Be careful, this will only ever work if you execute the script via a web server that populates DOCUMENT_ROOT
– Phil
Dec 22 '13 at 23:03
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Convert nested Python dict to object?
...y what the OP wants. A demonstration:
>>> from bunch import bunchify
>>> d = {'a': 1, 'b': {'c': 2}, 'd': ["hi", {'foo': "bar"}]}
>>> x = bunchify(d)
>>> x.a
1
>>> x.b.c
2
>>> x.d[1].foo
'bar'
A Python 3 library is available at https://github....
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
...重载<操作符了：
bool operator<(const a& a1, const a& a2)
{
if ( a1.m_a>=a2.m_a )
return false;
return true;
}
编译OK，可以使用了。
结论
因此，通过重载<操作符可以使自定义结构支持map容器。
另外的一种方法
下面介...
How can I format my grep output to show line numbers at the end of the line, and also the hit count?
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sorry switched to linux now its working :) it was windows version not so good
– London
Oct 19 '10 at 12:33
1
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NSInvocation for Dummies?
...send the addObject: message as follows:
[myArray addObject:myString];
Now, let's say you want to use NSInvocation to send this message at some other point in time:
First, you would prepare an NSInvocation object for use with NSMutableArray's addObject: selector:
NSMethodSignature * mySignatur...