Control structures
Just like the Python programming language, Vyper also has control structures, such as if and for, but with some restrictions compared to Python.
Let’s create a Vyper file, named ControlStructures.vy, and add the following code to it:
# @version ^0.3.0 @external @pure def sum() -> int128:     s: int128 = 0     for i in [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]:         s += i     return s @external @pure def greet(time: String[10]) -> String[20]:     if time == "morning":         return "Good morning!"     elif time == "evening":         return "Good evening!"     else:         return "How are you?"
As you can see, the way you use...
