Question

我想转换：

data = 'A|B|2|D|0.3|5|kg|1.69|m'

to list
['A','B',2,'D',0.3,5,'kg',1.69,'m'] 
# where every element is the type it should be (not all are strings)

我试过了：

data_list = da.split('|')
print(da_list)
['A', 'B', '2', 'D', '0.3', '5', 'kg', '1.69', 'm'] # every element is string

#Then

data_list02 = map(lambda x: (int(x) or float(x)) if x.isdigit() else str(x), data_list)
print (data_list02)
['A', 'B', 2, 'D', '0.3', 5, 'kg', '1.69', 'm'] # float are retained as str

我试过的lambda解决方案有什么问题？我不想写另一个def function

Answer 1

您可以使用literal_eval模块中的ast使用自定义方法，例如：

from ast import literal_eval as le

def format(data, sep= '|'):
    for k in data.split(sep):
        try:
            yield le(k)
        # Or:
        # You can escape any kind of odd data by using:
        # except Exception:
        #     yield k
        # Or list them then yield k
        except ValueError:
            yield k
        # Thanks to @RomanPerekhrest's comment
        except SyntaxError:
            yield k

data = 'A|B|2|D|0.3|5|kg|1.69|m'
final = list(format(data))
print(final)

输出：

['A', 'B', 2, 'D', 0.3, 5, 'kg', 1.69, 'm']

PS：我没有在大量数据中测试此方法，如果任何数据失败，请留下您的反馈。

Answer 2

您可以使用：

data_List=[int(x) if x.isdigit() else float(x) if x.replace(".", "", 1).isdigit() else str(x) for x in data]

示例：

>>> data = 'A|B|2|D|0.3|5|kg|1.69|m'
>>> data=data.split('|')
>>> data
['A', 'B', '2', 'D', '0.3', '5', 'kg', '1.69', 'm']
>>> data_List=[int(x) if x.isdigit() else float(x) if x.replace(".", "", 1).isdigit() else str(x) for x in data]
>>> data_List
['A', 'B', 2, 'D', 0.3, 5, 'kg', 1.69, 'm']

<强> 修改

如果您使用负整数或浮点数：

data_List=[int(x) if x.lstrip('-').isdigit() else float(x) if x.lstrip('-').replace(".", "", 1).isdigit() else str(x) for x in data]

示例：

>>> data = 'A|B|2|D|0.3|-5|kg|-1.69|m'
>>> data=data.split('|')
>>> data_List=[int(x) if x.lstrip('-').isdigit() else float(x) if x.lstrip('-').replace(".", "", 1).isdigit() else str(x) for x in data]
>>> data_list
['A', 'B', 2, 'D', 0.3, -5, 'kg', -1.69, 'm']

如何使用lambda函数准备包含整数，浮点数和字符串组合的列表？

2 个答案: