python3

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Compression

1. compress

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import zlib

...
zlib.compress(str.encode("utf-8"))
// compress requires byte

2. decompress

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import zlib

...
zlib.compress(byte).decode("utf-8")

3. Dynamodb Binary

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from boto3.dynamodb.types import Binary

# dynamodb.Binary Obj has attr: value
if isinstance(Item[column_name], Binary):
	box_plot_str = zlib.decompress(Item[column_name].column.value).decode("utf-8")

Json

json -> str

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json.dumps()

str -> json

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json.loads()

File

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file.open('sample.txt', 'w')
file.write()
file.close()

Decorator

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def log(func):
    def wrapper(*args, **kw):
        print('call %s():' % func.__name__)
        return func(*args, **kw)
    return wrapper
    
@log
def now():
    print('2015-3-25')