Python3, best alternatives to eval()? (input as an expression)
Question:
I’m using Python 3.
How can I input an expression without using eval(input("Input: "))?
I needed eval for an algebra calculator.
Answers:
how can I input an expression without using eval(input("Input: "))
Simply don’t use eval. In Python 3.x, input is the replacement for raw_input, so you don’t need eval. You can simply write your statement as input("Input: ").
Moreover, in Python 2.X, you should have used raw_input("Input: ") instead of eval(input("Input: ")).
If you’re the only person using that app and thus don’t need to be worried about security issues, just keep using eval() or exec().
Otherwise, just use a safe library for the specific task you need. E.g. numexpr I guess for a calculator.
Depending on how complicated your expressions are, ast.literal_eval may be a safer alternative.
I’m using Python 3.
How can I input an expression without using eval(input("Input: "))?
I needed eval for an algebra calculator.
how can I input an expression without using eval(input("Input: "))
Simply don’t use eval. In Python 3.x, input is the replacement for raw_input, so you don’t need eval. You can simply write your statement as input("Input: ").
Moreover, in Python 2.X, you should have used raw_input("Input: ") instead of eval(input("Input: ")).
If you’re the only person using that app and thus don’t need to be worried about security issues, just keep using eval() or exec().
Otherwise, just use a safe library for the specific task you need. E.g. numexpr I guess for a calculator.
Depending on how complicated your expressions are, ast.literal_eval may be a safer alternative.