a code which checks validation of a real number

Question

I have a code which checks whether the number in a line is a valid real number or not but it doesnt work properly, can some one please help me ?

Answer 1

Ace thanks a lot for your best help🙏🙏🙏

Answer 2

this is my code

Answer 3

https://code.sololearn.com/c6ivNUGyg6QS/?ref=app