python syntax marshmallow description

Quickly create list

>>> squares = [x**2 for x in range(1,10)]
>>> [n for n in range(1,100) if n%3==0]

>>> mybag = [' glass',' apple','green leaf ']
>>> [one.strip() for one in mybag]
>>> list(enumerate(mybag))

Performance and space

for key in _dict:
    pass

                                                                

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