[Python] Create an array that sums to a specific number?

I am using python. I am trying to create an array that sums to a certain number, but I want the array to be of a length of my choosing. Any idea on how to do this? For example, I want a array that sums to 1. So [.25,.25,.25,.25], but I want the numbers that are inside the array to be random, and I want my array to have a length of 98. Can someone please help?

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