Python and arrays

I know that python is a crazy language because of it's cycles constructions :)

So, I have an array of numbers but in string type:

a = ['1', '40', '356', '...']

I need this or a copy of this array but with float type instead of string. The only thing is that the code should be in one line.

Hel开发者_StackOverflowp me, please :)

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You can use map()^[docs] and float()^[docs]:

b = map(float, a)

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 a = ['1', '40', '356', '...']
 b = [float(x) for x in a]

This is called a list comprehension. It's a very powerful feature of Python, and you can read more about list comprehensions here:

http://docs.python.org/tutorial/datastructures.html#list-comprehensions