How to generate random number between 0 and 1 in genetic algorithm toolbox, Deap

Question

I am using genetic algorithm toolbox in Python. The code:

toolbox.register("attr_bool", random.randint, 0, 1) usually defines random numbers of 0 and 1 to be generated. The question is that I am looking for random numbers between 0 and 1. I used toolbox.register("attr_bool", random.uniform(0, 1)), but it takes me the below error: TypeError: the first argument must be callable

Possible duplicate of [Random number between 0 and 1 in python](http://stackoverflow.com/questions/33359740/random-number-between-0-and-1-in-python) — Two-Bit Alchemist, Aug 29 '16 at 23:50
Look at your parentheses. Compare them to the example's parentheses. — user2357112, Aug 29 '16 at 23:53

score 2 · Accepted Answer · answered Aug 29 '16 at 23:50

2

The error is telling you that it must be able to call the first argument, meaning that it has to be able to act as a function. random.randint is a function, but random.uniform(0, 1) is not. It's a floating-point number. To fix this, you can simply make an anonymous wrapper function with the lambda keyword:

toolbox.register("attr_bool", lambda: random.uniform(0, 1))

answered Aug 29 '16 at 23:50

TigerhawkT3

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`TypeError: integer argument expected, got float`. – Amn Kh Aug 30 '16 at 00:06
May be we should change: – Amn Kh Aug 30 '16 at 00:07
`toolbox.register("individual", tools.initRepeat, creator.Individual, toolbox.attr_bool, 100)` `toolbox.register("population", tools.initRepeat, list, toolbox.individual)` – Amn Kh Aug 30 '16 at 00:07
If it requires an integer, why are you trying to give it a floating-point number? – TigerhawkT3 Aug 30 '16 at 00:09
Because the parameters should be between 0 and 1. The optimal value also is in that range. – Amn Kh Aug 30 '16 at 00:12
If it's giving you an error that tells you it needs an integer, I'd say it shouldn't be between 0 and 1. – TigerhawkT3 Aug 30 '16 at 00:13

How to generate random number between 0 and 1 in genetic algorithm toolbox, Deap

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