python - 当项目包含括号时，将大字符串转换为 float 列表

Question

我有一个包含字符串的变量 r，但我需要它是一个 float 列表。这已在本论坛中多次提及，但我似乎找不到与这种情况相符的:

>>> print r
[0.06481481481481466, 0.06481481481481466, 0.06481481481481466, 0.0754716981132074, 0.07619047619047604, 0.07619047619047604, 0.07692307692307698, 0.07766990291262142, 0.07766990291262142, 0.07843137254901968, 0.07920792079207928, 0.07920792079207928, 0.08000000000000007, 0.08000000000000007]
>>> type(r)
<type 'str'>

当我尝试拆分它时...

    >>> r.split(',')
['[0.06481481481481466', ' 0.06481481481481466', ' 0.06481481481481466', ' 0.0754716981132074', ' 0.07619047619047604', ' 0.07619047619047604', ' 0.07692307692307698', ' 0.07766990291262142', ' 0.07766990291262142', ' 0.07843137254901968', ' 0.07920792079207928', ' 0.07920792079207928', ' 0.08000000000000007', ' 0.08000000000000007]']

现在 r 中的第一项和最后一项分别包含 '[' 和 ']'。很明显，为了将其转换为 float ，我需要删除它们。

这就是我所做的，但它似乎不起作用......

def stringlist_to_floatlist(e):
    split = e.split(',')
    l = len(split)
    for i in split:
        for br in ["[","]"]:
            if br in i:
                try:
                    i = float(i.replace(br,""))
                except TypeError:
                    continue
            else:
                try:
                    i = float(i)
                except TypeError:
                    continue
    return i 


>>> stringlist_to_floatlist(r)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 6, in stringlist_to_floatlist
TypeError: argument of type 'float' is not iterable

Answer 1

>>> ast.literal_eval('[0.06481481481481466, 0.06481481481481466, 0.06481481481481466, 0.0754716981132074, 0.07619047619047604, 0.07619047619047604, 0.07692307692307698, 0.07766990291262142, 0.07766990291262142, 0.07843137254901968, 0.07920792079207928, 0.07920792079207928, 0.08000000000000007, 0.08000000000000007]')
[0.06481481481481466, 0.06481481481481466, 0.06481481481481466, 0.0754716981132074, 0.07619047619047604, 0.07619047619047604, 0.07692307692307698, 0.07766990291262142, 0.07766990291262142, 0.07843137254901968, 0.07920792079207928, 0.07920792079207928, 0.08000000000000007, 0.08000000000000007]
>>> ast.literal_eval('[0.06481481481481466, 0.06481481481481466, 0.06481481481481466, 0.0754716981132074, 0.07619047619047604, 0.07619047619047604, 0.07692307692307698, 0.07766990291262142, 0.07766990291262142, 0.07843137254901968, 0.07920792079207928, 0.07920792079207928, 0.08000000000000007, 0.08000000000000007]')[0]
0.06481481481481466