Errors: safe divide

Some operations can blow up at runtime. Dividing by zero raises an exception:

10 / 0     # ZeroDivisionError: division by zero

Instead of letting your program crash, you can catch the error and decide what to do:

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.

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.