param.parameterized.Parameters.update

Parameters.update(arg=<Undefined>, /, **kwargs)

Update multiple parameters of this object or class before triggering events.

Allows setting the parameters of the object or class using a dictionary, an iterable, or keyword arguments in the form of param=value. The specified parameters will be updated to the given values.

This method can also be used as a context manager to temporarily set and then reset parameter values.

Parameters:

**kwargs (dict or iterable or keyword arguments) – The parameters to update, provided as a dictionary, iterable, or keyword arguments in param=value format.

References

https://param.holoviz.org/user_guide/Parameters.html#other-parameterized-methods

Examples

Create a Parameterized class:

>>> import param
>>> class P(param.Parameterized):
...    a = param.String()
...    b = param.String()

Define the instance:

>>> p = P(a="0. Hello", b="0. World")

Use update() to update the parameters:

>>> p.param.update(a="1. Hello", b="2. World")
>>> p.a, p.b
('1. Hello', '1. World')

Update the parameters temporarily:

>>> with p.param.update(a="2. Hello", b="2. World"):
...     print(p.a, p.b)
2. Hello 2. World

>>> p.a, p.b
('1. Hello', '1. World')

Lets check that the events are triggered after all parameters have been updated:

>>> @param.depends(p.param.a, watch=True)
... def print_a_b(a):
...     print(p.a, p.b)
>>> my_param.param.update(a="3. Hello",b="3. World")
3. Hello 3. World