Convert a string to a list
You can use ast.literaleval from the ast (Abstract Syntax Trees) module.
$ ipython Python 3.10.6 | packaged by conda-forge | (main, Oct 24 2022, 16:02:16) [MSC v.1916 64 bit (AMD64)] Type 'copyright', 'credits' or 'license' for more information IPython 8.4.0 -- An enhanced Interactive Python. Type '?' for help. In : s = "['a', 'b', 'c']" In : import ast ast.literal_eval(s) Out: ['a', 'b', 'c'] In : type(ast.literal_eval(s)) Out: list
This is safer than using
eval(). From the documentation https://docs.python.org/3/library/ast.html#ast.literal_eval
This function had been documented as “safe” in the past without defining what that meant. That was misleading. This is specifically designed not to execute Python code, unlike the more general eval(). There is no namespace, no name lookups, or ability to call out. But it is not free from attack: A relatively small input can lead to memory exhaustion or to C stack exhaustion, crashing the process. There is also the possibility for excessive CPU consumption denial of service on some inputs. Calling it on untrusted data is thus not recommended.
convert_a_string_to_a_list.txt · Last modified: 2023/02/26 03:28 by raju