Exception Handling in Python

Catch and handle errors with try / except / else / finally, and raise your own.

Easy

try:
    value = int(text)
except ValueError:
    print("Not a number")
else:
    print("Parsed", value)       # only if no exception
finally:
    print("Always runs")

Catch specific exceptions, not a bare except:, so real bugs aren't hidden. Raise your own with raise ValueError("resistance must be positive"), or define custom classes that inherit from Exception.

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