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Convert datetime object to a String of date only in Python
I see a lot on converting a date string to an datetime object in Python, but I want to go the other way.
I've got
11 A...
What's the difference between django OneToOneField and ForeignKey?
...eld(Engine)
Car2 model uses ForeignKey(Engine2, unique=True)
From within python manage.py shell execute the following:
OneToOneField Example
>>> from testapp.models import Car, Engine
>>> c = Car.objects.get(name='Audi')
>>> e = Engine.objects.get(name='Diesel')
>&g...
What's the difference between lists enclosed by square brackets and parentheses in Python?
...ove 'y=x' example , list and tuple behave in the same way now (verified in python3.8.5)
– Youjun Hu
Aug 15 at 9:11
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All combinations of a list of lists
I'm basically looking for a python version of Combination of List<List<int>>
7 Answers
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What is the easiest way to get current GMT time in Unix timestamp format?
Python provides different packages ( datetime , time , calendar ) as can be seen here in order to deal with time. I made a big mistake by using the following to get current GMT time time.mktime(datetime.datetime.utcnow().timetuple())
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Get the cartesian product of a series of lists?
...
itertools.product
Available from Python 2.6.
import itertools
somelists = [
[1, 2, 3],
['a', 'b'],
[4, 5]
]
for element in itertools.product(*somelists):
print(element)
Which is the same as,
for element in itertools.product([1, 2, 3], ['a',...
Rename a dictionary key
... a new key and removing the old key is how you can achieve the "rename" in python.
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Is there a decorator to simply cache function return values?
...
Starting from Python 3.2 there is a built-in decorator:
@functools.lru_cache(maxsize=100, typed=False)
Decorator to wrap a function with a memoizing callable that saves up to the maxsize most recent calls. It can save time when an expen...
How do I write data into CSV format as string (not file)?
...
In Python 3:
>>> import io
>>> import csv
>>> output = io.StringIO()
>>> csvdata = [1,2,'a','He said "what do you mean?"',"Whoa!\nNewlines!"]
>>> writer = csv.writer(output, quoting=...
Find intersection of two nested lists?
... 16]]
c3 = [[13, 32], [7, 13, 28], [1,6]]
Then here is your solution for Python 2:
c3 = [filter(lambda x: x in c1, sublist) for sublist in c2]
In Python 3 filter returns an iterable instead of list, so you need to wrap filter calls with list():
c3 = [list(filter(lambda x: x in c1, sublist)) fo...