问题
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.
Help me, please :)
回答1:
You can use map()[docs] and float()[docs]:
b = map(float, a)
回答2:
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
来源：https://stackoverflow.com/questions/6396733/python-and-arrays