What does the raises keyword do for error handling, how do I use it, and what does it returns if the function fails? All I could in the docs was "Both support raising exceptions, but this must be explicitly declared on a fn with the raises keyword." If its for raising exceptions, how do I do this properly?
#How to use `raises`
candid lance
jovial drift
from python import Python
# Handle errors so caller doesn't need to
fn test1():
try:
let np = Python.import_module("numpy")
print(np.array([1, 2, 3]))
except e:
print("Error importing and using numpy:", e.value)
# Doesn't handle errors, but caller will need to
fn test2() raises:
let np = Python.import_module("numpy")
print(np.array([1, 2, 3]))
# Doesn't need raises because `def` expects that it could raise
# Caller still needs to handle error
def test3():
let np = Python.import_module("numpy")
print(np.array([1, 2, 3]))
fn main():
let a = test1()
# These two will cause an error unless you put them in try/catch blocks or change `fn main()` to raises
let b = test2()
let c = test3()
What happens if they fail? Just a normal error?
candid lance
Is this essentially just a way to say one is aware that the code may not work?