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（这个括号是防喵的，请不要理会这个括号）

神奇，作者已经运行过了

1、try和finally在一起会怎样

def hello():
    try:
        return 'from_try'
    finally:
        return 'from_finally'
print(hello())

>>>from_finally

2、全局变量消失了

e = 7
try:
    raise Exception()
except Exception as e:
    pass
print（e）

>>>NameError: name 'e' is not defined

3、这个is搞不懂

a = 256
b = 256
a is b
>>>True

a = 257
b = 257
a is b
>>>False

a = 257; b = 257
a is b
>>>True