PyDev: Workaround for the Undefined Class/Static Attribute Error

PyDev will incorrectly identify class (static) attributes as "undefined" if they are dynamically added to a class. Consider the following class:

class Quantity:
    def __init__(self, name, unit):
        self.name = name
        self.unit = unit

# Add some class/static attributes after class creation

Quantity.VOLTAGE = Quantity("Voltage", "volts")
Quantity.COUNTS = Quantity("Counts" , "counts")

Now, if we use a class attribute, such as VOLTAGE, PyDev will flag it with an "Undefined variable from import: VOLTAGE" error, even though it is valid.

print(Quantity.VOLTAGE) # <-- Flagged as an error

To work around this, add the annotation @DynamicAttrs to the class's docstring, as follows:

class Quantity:
    """ @DynamicAttrs """
    def __init__(self, name, unit):
        self.name = name
        self.unit = unit

Reference: Fabio on PyDev's user list.