Python- How to convert a string to float ( i know what float() function is my question is different)

Question

I have a problem converting string to float. For example, I want to get an input like 10**2 and I want the program to save the result of 10**2 in the variable.

like this :

Number = float(input("Enter the number : "))
print(number * 2)

something like this and when i run and it says :

Enter the number :

and I give it 10**2 I want it to return 200

like this :

Enter the number : 10**2
200

How can I do it? I tried different ways non worked.

Ok, I can see your code and what you expect, but what does your code do and why is it not right? — quamrana
– quamrana, Commented Nov 13, 2022 at 16:20

C-3PO · Accepted Answer · 2022-11-13 16:18:07Z

2

You can use eval to parse general arithmetic expressions:

Number = eval(input("Enter the number : "))
print(Number * 2)

You can even provide formulas, such as 10**2 + 5, etc.

answered Nov 13, 2022 at 16:18

C-3PO

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2 Comments

Sam Mason Over a year ago

might be worth a warning! a silly/naughty user could enter __import__('os').system('rm /') which might not be bad, but adding "-rf" in there probably would be

C-3PO Over a year ago

I guess that is concern if this is plugged into a website, but the use case of the OP seemed to be an everyday application. In that case, eval is the same as the user opening a terminal and typing commands.

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