Buenas Practicas
Python
__init__
NO ES EL CONSTRUCTOR DE LA CLASE, ES EL INICIALIZADOR
Programar en Windows
Usar Python 2
import *
Two Scoops of django
Caracteres por linea
entre 80 y 100
print(len((1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1))) # 32
print(len((1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1))) # 43
print(len((1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1))) # 54
#
print(len((1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, \
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1))) # 43Por favor No Hagan Escaleras
if condicion1:
if condicion2:
if condicion3:
if condicion5:
if condicion6:
if condicion7:
Imports
Use el import *, bajo tu propio riesgo
Yes: import os
import sys
from subprocess import Popen, PIPE
No: import sys, os
# Stdlib imports
from __future__ import absolute_import
from math import sqrt
from os.path import abspath
# Core Django imports
from django.db import models
from django.utils.translation import ugettext_lazy as _
# Third-party app imports
from django_extensions.db.models import TimeStampedModel
# Imports from your apps
from splits.models import BananaSplit| from core.views import view | Absoluto | Se usa cuando se importa algo fuera del actual modulo |
| from .views import view | Relativo | Se usa cuando se importa un modulo en el mismo modulo |
| from views import view | Implicito Relativo | Usar bajo criterio propio, no es recomendado |
Tipos de Imports
__all__ == *
Convenciones
Yes:
# Aligned with opening delimiter.
foo = long_function_name(var_one, var_two,
var_three, var_four)
# More indentation included to distinguish this from the rest.
def long_function_name(
var_one, var_two, var_three,
var_four):
print(var_one)
# Hanging indents should add a level.
foo = long_function_name(
var_one, var_two,
var_three, var_four)
No:
# Arguments on first line forbidden when not using vertical alignment.
foo = long_function_name(var_one, var_two,
var_three, var_four)
# Further indentation required as indentation is not distinguishable.
def long_function_name(
var_one, var_two, var_three,
var_four):
print(var_one)
Tabs o Espacios
Espacios es la forma preferida para la sangría
Tabs solo debe usarse si ya el archivo a sido indentado de esta manera
Nombres
Modulos, debe ser en lowercase y cortos, se puede usar _ para mejorar la lectura
Clases CapWords
Funciones, Metodos de Clases y Variables, deben ser en lowercase y palabras separadas por _
Constantes son en uppercase y palabras separadas por _
self para los metodos de la instancia
cls para los metodos de la clase
class Prueba(object):
def metodo1(self):
print(self.__class__)
@classmethod
def metodo2(cls):
print(cls)
Prueba().metodo1() # <class '__main__.Prueba'>
Prueba.metodo2() # <class '__main__.Prueba'>
Metodos Magicos
| Magic Method | When it gets invoked (example) | Explanation |
|---|---|---|
| __new__(cls [,...]) | instance = MyClass(arg1, arg2) |
__new__ is called on instance creation |
| __init__(self [,...]) | instance = MyClass(arg1, arg2) |
__init__ is called on instance creation |
| __cmp__(self, other) # ** | self == other, self > other, etc. | Called for any comparison |
| __pos__(self) | +self | Unary plus sign |
| __neg__(self) | -self |
Unary minus sign |
| __invert__(self) | ~self |
Bitwise inversion |
| __index__(self) | x[self] |
Conversion when object is used as index |
| __nonzero__(self) #__bool__ | bool(self) |
Boolean value of the object |
| __getattr__(self, name) | self.name # name doesn't exist | Accessing nonexistent attribute |
| __setattr__(self, name, val) | self.name = val | Assigning to an attribute |
| __delattr__(self, name) | del self.name | Deleting an attribute |
| __getattribute__(self, name) | self.name | Accessing any attribute |
| __getitem__(self, key) | self[key] |
Accessing an item using an index |
| __setitem__(self, key, val) | self[key] = val | Assigning to an item using an index |
| __delitem__(self, key) | del self[key] | Deleting an item using an index |
| __iter__(self) | for x in self | Iteration |
| __contains__(self, value) | value in self, value not in self | Membership tests using in
|
| __call__(self [,...]) | self(args) | "Calling" an instance |
| __enter__(self) | with self as x: |
with statement context managers |
| __exit__(self, exc, val, trace) | with self as x: |
with statement context managers |
| __getstate__(self) | pickle.dump(pkl_file, self) | Pickling |
| __setstate__(self) | data = pickle.load(pkl_file) | Pickling |
| Magic Method | When it gets invoked (example) | Explanation |
|---|---|---|
| __eq__(self, other) | self == other | |
| __ne__(self, other) | self != other | |
| __lt__(self, other) | self < other | |
| __gt__(self, other) | self > other | |
| __le__(self, other) | self <= other | |
| __ge__(self, other) | self >= other | |
| __abs__(self) | abs(self) | |
| __round__(self, n) |
round(self, n) |
Boolean value of the object |
| __getattr__(self, name) |
self.name # name doesn't exist | Accessing nonexistent attribute |
| __setattr__(self, name, val) | self.name = val | Assigning to an attribute |
| __delattr__(self, name) | del self.name | Deleting an attribute |
| __getattribute__(self, name) | self.name | Accessing any attribute |
| __getitem__(self, key) | self[key] |
Accessing an item using an index |
| __setitem__(self, key, val) | self[key] = val | Assigning to an item using an index |
| __delitem__(self, key) | del self[key] | Deleting an item using an index |
| __iter__(self) | for x in self | Iteration |
| __contains__(self, value) | value in self, value not in self | Membership tests using in |
| __call__(self [,...]) | self(args) | "Calling" an instance |
| __enter__(self) | with self as x: |
with statement context managers |
| __exit__(self, exc, val, trace) | with self as x: |
with statement context managers |
| __getstate__(self) | pickle.dump(pkl_file, self) | Pickling |
| __setstate__(self) | data = pickle.load(pkl_file) | Pickling |
Buenas Practicas
By Leonardo Fabio Orozco Padilla
Buenas Practicas
- 1,640
