如何将其转换为数组？

Question

我正在尝试将看起来像这样的字符串转换为元组数组

"[(1,2), (2,3), (4,5)]" - ＆gt; [(1,2), (2,3), (4,5)]

以下是我想填充的代码体：

def convert_to_polygon(polygon_string):

    return polygon_array

我应该使用python库吗？这项工作是否存在？

Answer 1

您可以使用ast.literal_eval：

>>> import ast
>>> s = '{{1,2},{2,3},{4,5}}'
>>> polygon_array = ast.literal_eval(s.replace('{', '(').replace('}', ')'))
>>> polygon_array
((1, 2), (2, 3), (4, 5))
>>> polygon_array[1][0]
2

如果需要元组列表，请使用list(polygon_array)。

Answer 2

>>> def convert_to_polygon(polygon_string):
...     return eval(polygon_string)
... 
>>> polygon_string = "[(1,2), (2,3), (4,5)]"
>>> convert_to_polygon(polygon_string)
[(1, 2), (2, 3), (4, 5)]