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xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools ), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun

解决

xcode-select –install

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开启HiDPI

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sudo defaults write /Library/Preferences/com.apple.windowserver DisplayResolutionEnabled -bool YES
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def two_type(t=1):
    def dec(fun):
        def real_fun(x):
            if t == 1:
                print ("i am real")
            else:
                print ("i am false")
            fun(x)
        return real_fun
    return dec

@two_type(t=0)
def fun(x):
    print(2*x)
fun(2)

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def make_averager():
	count = 0
	total = 0

	def averager(new_value):
		count += 1
		total += new_value
		return total / count
	return averager

对于数字，字符串，元祖 不可变类型来说，只能读取不能更新。 重新绑定会隐式创建局部变量count.
只有可变变量是可以的。

或者使用nonlocal count, total

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def use_logging(func):

	def wrapper(*args, **lkwargs):
		logging.warn("%s is running" % func.__name__)
		return func(*args, **lkwargs)
	return wrapper

def bar():
	print('i am bar')

bar = use_logging(bar)
bar()
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class Foo(object):
	def __init__(self, func):
		self._func = func

	def __call__(self):
		print('class decorator running')
		self._func()
		print('class decorator ending')

@Foo
def bar():
	print('bar')

bar()

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There is an option “unlimited scrollback buffer” which you can find under Preferences > Profiles > Terminal or you can just pump up number of lines that you want to have in history in the same place.

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conda create -n py36-test python=3.6
source activate py36-test
python -m ipykernel install --name py36-test
source deactivate
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export PATH=~/anaconda2/bin:$PATH

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把 ~/Library/Preferences 里的 com.qiuyuzhou.ShadowsocksX-NG.plist 和 ~/Library/Application Support 里的 ShadowsocksX-NG/ 删掉.