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"""
Example collection data:
{
  _id: “9991f84c4b0a110af3830012”,
  name: “John Smith”,
  brands: [“Nike”, “Asics”, “Adidas”]
}

{
  _id: “9991f84c4b0a110af3830012”,

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"""
The built-in function iter() can be called with two arguments
where the first argument must be a callable object (function)
and second is the sentinel. The iterator calls this function 
until the returned value is equal to the sentinel.
"""
inf = iter(int,1)

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>>> list1, list2, list3 = [1,2,3], ['a','b','c'], [7,8,9]
>>> all_lists = sum([list1, list2, list3], [])
>>> all_lists
[1, 2, 3, 'a', 'b', 'c', 7, 8, 9]

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"""
The expression x and y first evaluates x; if x is false, its value is returned; otherwise, y is evaluated and the resulting value is returned.

The expression x or y first evaluates x; if x is true, its value is returned; otherwise, y is evaluated and the resulting value is returned.
"""

In [3]: True and ['a']
Out[3]: ['a']

In [4]: False and ['a']

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def find_defining_class(obj,meth_name): 
    for ty in type(obj).mro(): 
        if meth_name in ty.__dict__: 
            return ty

Here's an example:

>>>hand=Hand() 
>>>print find_defining_class(hand,'shuffle') 
<class'Card.Deck'>

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from math import sqrt
N = 100
result = [p for p in range(2, N) if 0 not in [p % d for d in range(2, int(sqrt(p)) + 1)]]

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import string
replace_punctuation = string.maketrans(string.punctuation, ' ' * len(string.punctuation))
line = line.translate(replace_punctuation)

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import datetime
datetime.datetime.now().replace(microsecond=0)