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How to toggle a value in Python
...0
>>> x ^= 1
>>> x
1
The technique generalizes to any pair of integers. The xor-by-one step is replaced with a xor-by-precomputed-constant:
>>> A = 205
>>> B = -117
>>> t = A ^ B # precomputed toggle constant
>>> x = A
>>> x ^...
Setting the correct encoding when piping stdout in Python
...he problem just exist when piping to stdout .
I tested in Fedora 25 Python 2.7.13
python --version
Python 2.7.13
cat b.py
#!/usr/bin/env python
#-*- coding: utf-8 -*-
import sys
print sys.stdout.encoding
running ./b.py
UTF-8
running ./b.py | less
None
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Programmatically change log level in Log4j2
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In log4j 2.7 LoggerContext hasn't a getConfiguration() method, see logging.apache.org/log4j/2.x/log4j-api/apidocs/index.html?org/…
– maxxyme
Nov 23 '16 at 13:53
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Multiple variables in a 'with' statement?
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It is possible in Python 3 since v3.1 and Python 2.7. The new with syntax supports multiple context managers:
with A() as a, B() as b, C() as c:
doSomething(a,b,c)
Unlike the contextlib.nested, this guarantees that a and b will have their __exit__()'s called even if ...
使用App Inventor扩展实现多点触控：Rotation Detector · App Inventor 2 中文网
... to implement multitouch: Rotation Detector
Xinyue Deng dengxinyue0420@gmail.com
DRAFT (March 6, 2016): Building extensions requires the App Inventor extensions capability, which is not yet incorporated into the App Inventor release. But you can try some ofary AI2 server.
You can implement the...
使用App Inventor扩展实现多点触控：Rotation Detector · App Inventor 2 中文网
... to implement multitouch: Rotation Detector
Xinyue Deng dengxinyue0420@gmail.com
DRAFT (March 6, 2016): Building extensions requires the App Inventor extensions capability, which is not yet incorporated into the App Inventor release. But you can try some ofary AI2 server.
You can implement the...
使用App Inventor扩展实现多点触控：Rotation Detector · App Inventor 2 中文网
... to implement multitouch: Rotation Detector
Xinyue Deng dengxinyue0420@gmail.com
DRAFT (March 6, 2016): Building extensions requires the App Inventor extensions capability, which is not yet incorporated into the App Inventor release. But you can try some ofary AI2 server.
You can implement the...
使用App Inventor扩展实现多点触控：Rotation Detector · App Inventor 2 中文网
... to implement multitouch: Rotation Detector
Xinyue Deng dengxinyue0420@gmail.com
DRAFT (March 6, 2016): Building extensions requires the App Inventor extensions capability, which is not yet incorporated into the App Inventor release. But you can try some ofary AI2 server.
You can implement the...
How to import a module given the full path?
...ngs = run_path("/path/to/file.py")
That interface is available in Python 2.7 and Python 3.2+
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Python dictionary from an object's fields
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Note that best practice in Python 2.7 is to use new-style classes (not needed with Python 3), i.e.
class Foo(object):
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Also, there's a difference between an 'object' and a 'class'. To build a dictionary from an arbitrary object, it's sufficient to us...