Errors and exceptionserrors-safe-divide
Lesson·difficulty 2/5·~10 min
Errors: safe divide
Errors: safe divide
Some operations can blow up at runtime. Dividing by zero raises an exception:
python
10 / 0 # ZeroDivisionError: division by zero
Instead of letting your program crash, you can catch the error and decide what to do:
python
try:
risky()
except ValueError:
print("handled it")
Only the specific exception you name is caught — which keeps you from accidentally hiding unrelated bugs.
Your task
Write safe_divide(a, b) that returns a / b, but returns None when b
is 0 instead of raising ZeroDivisionError.
python
safe_divide(6, 3) # 2.0
safe_divide(7, 2) # 3.5
safe_divide(5, 0) # None
Hint: wrap the division in try / except ZeroDivisionError.
Tests
- even division
- fractional
- divide by zero
- negative
- zero numerator (hidden)
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