This is an immutable truth.

Immutable means you cannot change it.

A Python tuple is just an immutable list.

Truth based on certainty is not as immutable as truth based on factual evidence.

language, this may be new to you. A symbol is really just an immutable string.

And how we look, though it is superficial and immutable, has a huge impact on our lives.

The earth becomes as solid and immutable as the heavens, while the sky and stars take on the pyrotechnic sharpness and dynamism... of modern artificial lighting.

A key difference between mutable objects and immutable objects is once an object is mutable, then we have to worry about other variables that might refer to the same object.

Immutable, so that it may warn of a severe punishment from Him and give happy tidings to those who believe and do the right that there is a better reward (of Paradise) for them,

There's no way to change the value of the string, and the error says there's no way to do assignment in a string, that that type of object, because it's immutable, does not support assignment.

Before trying again, Van Gogh retreats from Arles to a village... where his brushwork changes radically the earth becomes as solid and immutable as the heavens, while the sky and stars take on the pyrotechnic sharpness and dynamism... of modern artificial lighting.

And of course, barring surgery, or the fake tan that I got two days ago for work, there's very little that we can do to transform how we look, and how we look, though it is superficial and immutable, has a huge impact on our lives.