如何将字符串转换为 python object？

Question

So, I have got this piece of string:

"[{'id': 45, 'user_id': 2, 'cart_item_id': UUID('0fdc9e75-3d9c-4b89-912b-7058e1233432'), 'quantity': 1}]"

And i want to convert it to list of dict in python
Can anyone please help me out

Answer 1

A nice way would be using eval() :

my_obj = eval(your_string)

A not very nice, but a bit safer way would be parsing it as json . But quotes have to be handled first:

my_obj = json.loads(your_string.replace("'", '"')

Option 1 has to be used with caution as eval will evaluate any python code and thus is prone to attacks. Option 2 is ok, but a corner case with quotes is to be expected.

Answer 2

Try this

  def Convert(string):
        li = list(string.split("-"))
        return li
      
    # Driver code    
    str1 = "[{'id': 45, 'user_id': 2, 'cart_item_id': UUID('0fdc9e75-3d9c-4b89-912b-7058e1233432'), 'quantity': 1}]"
    print(Convert(str1))

Answer 3

You can use eval to evaluate your string to object. Just make sure the classes used/present in the string are available in the local or global namespace.

from uuid import UUID

output = eval(
    """[{'id': 45, 'user_id': 2, 'cart_item_id': UUID('0fdc9e75-3d9c-4b89-912b-7058e1233432'), 'quantity': 1}]""",
)

Answer 4

Here is a way to do that:

string = "[{'id': 45, 'user_id': 2, 'cart_item_id': UUID('0fdc9e75-3d9c-4b89-912b-7058e1233432'), 'quantity': 1}]"


with open('your_file.py') as file:
    data = file.read()

with open('your_file.py', 'w') as file:
    file.write(f'list_ = {string}\n{data}')

this will literally add the list to the file.