I cant run it and facing errore.What should I do?

Question

num = input(":")
if float(num)<0:
raise ValueError("Negative!")

Answer 1

There is an IndentationError because you have an extra space before if statement.

num = input(":")
if float(num)<0:
raise ValueError("Negative!")

Just remove extra space and your problem will be solved.

Answer 2

Tnx, elder

Answer 3

num = input(":")
if float(num)<0:
raise valueerror("negative!")