alternative to use eval python eval-used / W0123

Question

d1 = {
        "a": "test"
    }
    
    cmd_dict = {
        "cmd1": "d1['a']",
        "cmd2 : "os.getcwd()"
    }
value = eval(md_dict['cmd1]) 
print(value)

Not i will get the value as test.

I am getting pylint error W0123 becasue i am using eval. is there any way to perform the same without using eval.

If you want to transport arbitrary Python code as text and have it run… no. Why are you doing that in the first place? — deceze, Jun 01 '23 at 05:43
Is this a purely academic query or is there a real-life use-case for this? — DarkKnight, Jun 01 '23 at 06:34

score 1 · Answer 1 · answered Jun 01 '23 at 05:52

1

Put functions in your dictionary, and you can simply call them like any other function. No eval() needed:

import os

d1 = {}
    
cmd_dict = {
    "cmd1": lambda: d1['a'],
    "cmd2" : os.getcwd,
}

d1['a'] = 'test'

value = cmd_dict['cmd1']()
print(value)  # test

Note that lambda creates a small anonymous function that will evaluate and return d1['a'] when it's called; the delayed evaluation (which, again, you do not need eval() to do) is why it returns test even though that value is set in d1 after cmd_dict has been created.

answered Jun 01 '23 at 05:52

Samwise

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thank you very much for the info..sorry i have one further question..if i have all the json data in cmd.json() file..is there any way to specify lambda inside json file cmd_dict = { "cmd1": lambda: d1['a'], "cmd2" : os.getcwd, } Exampl {"cmd1": lambda : d1[a] } – SS L Jun 01 '23 at 06:02
No -- you probably want to create a Python module rather than putting Python source code inside a JSON file. – Samwise Jun 01 '23 at 06:10

alternative to use eval python eval-used / W0123

1 Answers1