PYTHON

python class with optional arguments

class Optioncal_transition(object):
  def __init(self, **args):
    self.chemical = args.get('chemical')
    self.i = args.get('i')
    self.j = args.get('j', self.i)

python class optional attributes

You can use hasattr and getattr.

For example:

hasattr(foo, 'bar')
would return True if foo has an attribute named bar, otherwise False and

getattr(foo, 'bar', 'quux')
would return foo.bar if it exists, otherwise defaults to quux.

python class optional arguments

class Point:
    def __init__(self, x, y, z = 0):
        self.x = x
        self.y = y
        self.z = z
    
    def __str__(self):
        return f"X: {self.x}, Y: {self.y}, Z:{self.z}"

print(Point(1, 2)) # Object 1
print(Point(54, 92, 0)) # Object 2
print(Point(99, 26, 100)) # Object 3


# Output:

# X: 1, Y: 2, Z:0
# X: 54, Y: 92, Z:0
# X: 99, Y: 26, Z:100