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How to join two sets in one line without using “|”
...;> from operator import or_
>>> from functools import reduce # python3 required
>>> reduce(or_, [{1, 2, 3, 4}, {3, 4, 5, 6}])
set([1, 2, 3, 4, 5, 6])
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What's the difference between globals(), locals(), and vars()?
... variables are copied into locals() again.
Two notes:
This behavior is CPython specific -- other Pythons may allow the updates to make it back to the local namespace automatically.
In CPython 2.x it is possible to make this work by putting an exec "pass" line in the function. This switches the fu...
App Inventor 2 App上架国内应用市场完整指南 · App Inventor 2 中文网
... 首页 教育 中文教育版 各版本对比 App上架指南 入门必读 IoT专题 AI2拓展 Aia Store 关于 关于我们 发布日志 服务条款 ...
Bare asterisk in function arguments?
...argument when you have no following keyword arguments.
See this answer or Python 3 documentation for more details.
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Why #egg=foo when pip-installing from git repo
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If you've made a custom Python package, when you ran setuptools, a directory named project-name.egg-info/top_level.txt should have been created. Use the contents of this file as the value for the egg parameter.
– dspacejs
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Why does writeObject throw java.io.NotSerializableException and how do I fix it?
...ta and it's third party, consider other means of serialization, like JSON, XML, BSON, MessagePack, etc. where you can get 3rd party objects serialized without modifying their definitions.
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Hashing a dictionary?
...hing needs to be consistent across different machines. Implementations of python on cloud platforms like Heroku and GAE will return different values for hash() on different instances making it useless for anything that must be shared between two or more "machines" (dynos in the case of heroku)
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python-pandas and databases like mysql
... a DataFrame from it. SQLAlchemy makes it easier to combine SQL conditions Pythonically if you intend to mix and match things over and over.
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import Table
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionma...
Is there a built-in function to print all the current properties and values of an object?
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unpythonic, because follows not-invented-here
– user3850
Oct 10 '08 at 17:31
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Why can't I use a list as a dict key in python?
I'm a bit confused about what can/can't be used as a key for a python dict.
11 Answers
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