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    <p>Pass the instance explicitly as first argument:</p> <pre><code>method_to_use = order[i] method_to_use(my_pop) </code></pre> <p>Full working code:</p> <pre><code>order_type = 'a' class Population (object): def __init__(self,a): self.a = a def method1 (self): self.a = self.a*2 return self def method2 (self): self.a += 2 return self def method3 (self): self.a = 0 return self if order_type=='a': order = [Population.method1, Population.method2, Population.method3] elif order_type=='b': order = [Population.method2, Population.method1, Population.method3] else : order = [Population.method3, Population.method2, Population.method1] my_pop = Population(3) while iteration &lt; 100: iteration +=1 for method_to_use in order: method_to_use(my_pop) </code></pre> <p>If you want to pass more than one argument, simply use the <code>*args</code> syntax:</p> <pre><code>if order_type=='a': order = [Population.method1, Population.method2, Population.method3] arguments = [(), (), (the_argument,)] elif order_type=='b': order = [Population.method2, Population.method1, Population.method3] arguments = [(), (), (the_argument,)] else : order = [Population.method3, Population.method2, Population.method1] arguments = [(the_argument, ), (), ()] my_pop = Population(3) while iteration &lt; 100: iteration +=1 for method_to_use, args in zip(order, arguments): method_to_use(my_pop, *args) </code></pre> <p>The <code>()</code> is an empty tuple, hence <code>*args</code> will expand to no additional arguments, while <code>(the_argument,)</code> is a 1-element tuple that will pass the argument to the method.</p>
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    1. COThks you all for your help! What if I need to pass for method 3 (but not to other methods) a second argument then?
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    2. COThank you Bakuriu!
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