I have a couple of different functions, that each outputs a json
string if successful. I cannot know beforehand whether they will fail or not so I want have to try them all in the order specified below. How can I do this?
I have tried things like:
import func1
import func2
import func3
def compi(url):
try:
return func1(url)
except:
return func2(url)
else:
return func3(url)
I am certain that func3
will not fail.
def compi(url):
functions = [func1, func2, func3]
for func in functions:
try:
return func(url)
except:
pass
#oops, none of them succeeded.
raise Exception("All functions failed to return a value.")
Python functions are first-class objects, so instead of going through them manually, you can just make a list of them and loop through it, like so:
tested_funcs = [f1, f2, f3]
for f in tested_funcs:
result = f(someinput)
if result: break
return result
Wrap the inner block in a try/catch if it throws an error upon failing.
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