new_contents: # Code from https://www.geeksforgeeks.org/g-fact-34-class-or-static-variables-in-python/
  # Copy - Paste here to test it directly
  # Python program to show that the variables with a value
  # assigned in class declaration, are class variables
  
  # Class for Computer Science Student
  class CSStudent:
  	stream = 'cse'				 # Class Variable
  	def __init__(self,name,roll):
  		self.name = name		 # Instance Variable
  		self.roll = roll		 # Instance Variable
  
  # Objects of CSStudent class
  a = CSStudent('Geek', 1)
  b = CSStudent('Nerd', 2)
  
  print(a.stream) # prints "cse"
  print(b.stream) # prints "cse"
  print(a.name) # prints "Geek"
  print(b.name) # prints "Nerd"
  print(a.roll) # prints "1"
  print(b.roll) # prints "2"
  
  # Class variables can be accessed using class
  # name also
  print(CSStudent.stream) # prints "cse"
  
  # Now if we change the stream for just a it won't be changed for b
  a.stream = 'ece'
  print(a.stream) # prints 'ece'
  print(b.stream) # prints 'cse'
  
  # To change the stream for all instances of the class we can change it
  # directly from the class
  CSStudent.stream = 'mech'
  
  print(a.stream) # prints 'mech' <-- error here, it prints ece
  print(b.stream) # prints 'mech'
  
subject: Test d'un bout de code de GeeksForGeeks