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multi-value-return pattern in Python

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originally, you have:

def func():
    return 1
print func() + func()

Then you decided that func() can return some extra information but you don’t want to break previous code (or modify them one by one). It looks like

def func():
    return 1, "extra info"
value, extra = func()
print value # 1 (expected)
print extra # extra info (expected)
print func() + func() # (1, 'extra info', 1, 'extra info') (not expected, we want the previous behaviour, i.e. 2)

The previous codes (func() + func()) are broken. You have to fix it.

The solution is adapted from the answer,

http://stackoverflow.com/questions/17648591/multiple-value-return-pattern-in-python-not-tuple-list-dict-or-object-soluti/17680730#17680730

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