将字符串列表转换为数字列表Python

Question

I am using regular expressions in Python 3 to obtain a list of value:

lst = ['1.1' , '2.2' , '3.3']

Instead, I want a list of numbers as below:

lst = [1.1 , 2.2 , 3.3]

Answer 1

You can use a list comprehension.

lst = ['1.1' , '2.2' , '3.3']
lst = [float(x) for x in lst]

I'm using lst here because list is already taken by the builtin list .

Answer 2

Try python's map function. It takes a function and an iterable and applies the function to each item in the iterable.

lst = list(map(float, lst))

The call to list is required in python 3, because the built-in map function returns a special map object as opposed to a list. I would also recommend not using list as a variable name, as list is a built-in function in python.