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Pythonic way set variables if none in __init__


Pythonic way set variables if none in __init__

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Pythonic way set variables if none in __init__
Tag : python , By : Icyflash
Date : November 28 2020, 04:01 AM

I wish this helpful for you What's the most pythonic or elegant way of achieving this? , Use ternary operator
def __init__(self, connection=None, some=None, thing=None, else=None):
   self.connection = SetConnection() if connection is None else connection

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Pythonic: use of __dict__ in the function self.__init__ of a class


Tag : class , By : ChristianM
Date : March 29 2020, 07:55 AM
I wish did fix the issue. Yes, it is reasonable to update the instance dictionary directly. Alternatively, you can use setattr to update the variables. I've seen both approaches used in production code.
With setattr there is no need to touch the instance dictionary directly:
class MyClass():
    def __init__(self):
        for var in 'a', 'b', 'c':
            setattr(self, var, dict())
class MyClass():
    def __init__(self):
        vars(self).update(a=dict(), b=dict(), c=dict())

Pythonic approach to defining __init__ helper methods?


Tag : python , By : Terrence Poon
Date : March 29 2020, 07:55 AM
hop of those help? Are you sure it won't work in the order you're already using? Remember, you're not using C. The called method doesn't have to appear in the class definition before calling code, so long as it has been defined by the time it gets called.
I would, however, change this:
_load_from_file(self)
self._load_from_file()

Is it pythonic to use __init__.py modules of a package for generic, abstract classes?


Tag : python , By : Lunis Neko
Date : March 29 2020, 07:55 AM
I hope this helps you . It depends by what is the API you want to provide. For example the collections module in the standard library defines all the classes in the __init__.py1. And the standard library should be pretty "pythonic", whatever that means.
However it provides mostly a "module-like" interface. It's quite rare to see:
import collections.abc
from .abc import *
from . import abc

# ...
__all__ = list_of_names_to_export + abc.__all__

Is it possible for `topmost.__init__.py` to access global variables in `topmost.submodule.__init__.py`?


Tag : python , By : Grant
Date : March 29 2020, 07:55 AM
I wish did fix the issue. A global variable declared/defined through/within a function will appear (in the global scope) when the function is first executed.
Proof:
$ python3
Python 3.5.2 (default, Nov 17 2016, 17:05:23) 
[GCC 5.4.0 20160609] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> 'abc' in globals()
False
>>> def foo():
...     global abc
...     abc = 123
...     print('foo')
... 
>>> 'abc' in globals()
False
>>> foo()
foo
>>> 'abc' in globals()
True
>>> 
topmost
    /__init__.py
    /submodule
      /__init__.py
def characterize(input):
    global abc 
    abc = load_abc_model()
    return abc.func(input)

Is it pythonic to apply decorator to __init__ function?


Tag : python , By : Yst
Date : March 29 2020, 07:55 AM
hop of those help? I think "pythonic" here may be subjective (And I use may lightly) but I believe keeping to the more standard approach and doing sanity checks within __init__ and keep the guessing to a minimum later on in debugging or when working with a team.
Something like this seems to do the same thing but feel more natural and is easier to follow.
def sanity_check():
    print('a')
    #do checks here
    return True #or False

class testClass(object):

    def __init__(self):
        if sanity_check():
            print('b')
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