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Creating a singleton in Python
...
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.__call__...
How to initialize all members of an array to the same value?
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23 Answers
23
Active
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Extract traceback info from an exception object
...to this question depends on the version of Python you're using.
In Python 3
It's simple: exceptions come equipped with a __traceback__ attribute that contains the traceback. This attribute is also writable, and can be conveniently set using the with_traceback method of exceptions:
raise Exceptio...
How can I create a copy of an object in Python?
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193
To get a fully independent copy of an object you can use the copy.deepcopy() function.
For more...
Python != operation vs “is not”
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310
== is an equality test. It checks whether the right hand side and the left hand side are equal...
What does $_ mean in PowerShell?
... the current value in the pipe line, which is called $PSItem in Powershell 3 and newer.
1,2,3 | %{ write-host $_ }
or
1,2,3 | %{ write-host $PSItem }
For example in the above code the %{} block is called for every value in the array. The $_ or $PSItem variable will contain the current val...
KIO4_Gradient 拓展：布局中的颜色渐变 - App Inventor 2 中文网 - 清泛IT...
...droid/graphics/drawable/GradientDrawable.Orientation.html- 类型： 0 到 3 之间的整数：LINEAR_GRADIENT、RADIAL_GRADIENT或SWEEP_GRADIENThttps://developer.android.com/reference/android/graphics/drawable/GradientDrawable.html#setGradientType(int)- 形状： 0 到 3 之间的整数：LINE、OV...
How to make a class JSON serializable
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33 Answers
33
Active
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How to pretty-print a numpy.array without scientific notation and with given precision?
...f the output:
import numpy as np
x=np.random.random(10)
print(x)
# [ 0.07837821 0.48002108 0.41274116 0.82993414 0.77610352 0.1023732
# 0.51303098 0.4617183 0.33487207 0.71162095]
np.set_printoptions(precision=3)
print(x)
# [ 0.078 0.48 0.413 0.83 0.776 0.102 0.513 0.462 0.335...
How to get the caller's method name in the called method?
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243
inspect.getframeinfo and other related functions in inspect can help:
>>> import inspe...