Dictionaries

Dictionary = array with a text as index
Also called hash or associative array in other languages
Can store 'anything':
prm['damping'] = 0.2             # number

def x3(x): 
    return x*x*x
prm['stiffness'] = x3            # function object

prm['model1'] = [1.2, 1.5, 0.1]  # list object
The text index is called key

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