This would break uses of locals(), e.g.
def foo(a, b):
x = a + b
if not x:
return None
del x
print('{x}, {a}, {b}'.format(**locals()))
return a * b
foo(1, 2)
Plus if the calculation raises an exception and I'm looking at the report
on Sentry, I'd like to see the values of all variables. In particular I
might have expected the function to return early and I want to see what `x`
was.
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