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What would a “frozen dict” be?
...if config is None:
config = default_config = {'a': 1}
...
In python3 you have the option of this:
from types import MappingProxyType
default_config = {'a': 1}
DEFAULTS = MappingProxyType(default_config)
def foo(config=DEFAULTS):
...
Now the default config can be updated dynami...
Generate a heatmap in MatPlotLib using a scatter data set
...
Too bad it doesn't work with python3. It installs, but then crashes when you try to use it...
– Fábio Dias
May 15 '18 at 18:46
1
...
List of ANSI color escape sequences
...3[0m");
In C++ you'd use
std::cout<<"\033[31;1;4mHello\033[0m";
In Python3 you'd use
print("\033[31;1;4mHello\033[0m")
and in Bash you'd use
echo -e "\033[31;1;4mHello\033[0m"
where the first part makes the text red (31), bold (1), underlined (4) and the last part clears all this (0).
As d...
使用Activity启动器组件 · App Inventor 2 中文网
...aia 文件），你可以按如下方式找到这些名称：
将源代码下载到你的计算机。
使用文件资源管理器或解压缩实用程序，找到名为 youngandroidproject/project.properties 的文件。
第一行以main=开头。 之后的所有内容都是包名和类名。
例...
Python read-only property
...;module>()
----> 1 f.a = 'boom'
/home/oznt/.virtualenvs/tracker/lib/python3.5/site-packages/rop.py in __setattr__(self, name, value)
116 pass
117 else:
--> 118 raise AttributeError("Can't touch {}".format(name))
119
1...
If Python is interpreted, what are .pyc files?
...ython caches the byte code in a foo.pyc file right next to the source.
In python3, Python's import machinery is extended to write and search for byte code cache files in a single directory inside every Python package directory. This directory will be called __pycache__ .
Here is a flow chart descr...
Creating a singleton in Python
...s[cls]
class Logger(object):
__metaclass__ = Singleton
Or in Python3
class Logger(metaclass=Singleton):
pass
If you want to run __init__ every time the class is called, add
else:
cls._instances[cls].__init__(*args, **kwargs)
to the if statement in Singleton.__...
Saving an Object (Data persistence)
...
Quick example using company1 from your question, with python3.
import pickle
# Save the file
pickle.dump(company1, file = open("company1.pickle", "wb"))
# Reload the file
company1_reloaded = pickle.load(open("company1.pickle", "rb"))
However, as this answer noted, pickle o...
多媒体组件 · App Inventor 2 中文网
...，推荐使用“讯飞语音+”识别引擎，识别率较高，点此下载apk安装。
安装完成后无需设置，当触发需要识别语音时，系统会弹出对话框让你选择使用哪个识别引擎，这时选择“讯飞语音+”，点“始终”就OK了。
...
List changes unexpectedly after assignment. How do I clone or copy it to prevent this?
...
Actually it seems that currently, python3.8, .copy() is slightly faster than slicing. See below @AaronsHall answer.
– loved.by.Jesus
Apr 24 at 8:11
...