7 More Tricks to Write Better Python Code

- 00:30 Inline if-else statements
- 03:00 Sequence comparisons
- 10:00 Extended unpacking (Python-3 only)
- 13:57 Dict comprehensions
- 18:25 collections.OrderedDict
- 26:17 collections.Counter

[yuanzhenggay]

I watched the previous 7 tricks video 2days ago. I want to thank you again for the new 7 more tricks video.

[snoopyjc]

Nice! FYI dict is now insertion ordered as of python 3.6 (guaranteed in 3.7+)

[zzphantom]

in the case where all your dict values are integers, instead of passing (lambda: 0) to defaultdict you can do defaultdict(int), which will also default to 0

[francescovanspronsen]

I wonder how many people know about Groningen xD
Thanks for the excellent video Sebastiaan!

[thesavvyfounder]

Thx. On zip. There is also zip_longest which allows you to specify a value for a missing item in the iterable. So following your version comparison example you can specify a missing value is 0.

[johnreddenbacher]

Awesome job! Only problem is I was disappointed that you didn't use Maastricht. It is one of my favorite cities when I visit the Netherlands. Thank you for the lesson :)

[srrkmm]

Great sir, super explanation and teaching . you know extreme teaching capabilities. Appreciate great help :)

[ansakezay]

great tut, do more tutorial master . greats from Egypt

Ad 9:40: You could use the lexicographic example of sorting names - "Ben" comes before "Benny" because it's shorter.

Great videos tho! Thanks for them :)

[vitalyefremov]

Instead of defaultdict(lambda: 0) you may use defaultdict(int) as int() == 0

[kurtb]

In Python 3.6 you can change your print statements to (from example 1):

print(f'Update check: {msg}')

Uses format (f) and the variable {msg}. VERY Pythonic

[addishiwottadesse]

at 09:24, how about ?
msg = "update needed" if cmp(latest_python, my_python) else "upto date"

[iamsandeep]

Very helpful, however the lists/tuples/dicts with same number of items are very rare in real world. Perhaps that can be one of the topics for next video along with good ways of running multiple loops for such uneven elements. All the best.

[be_pie_today]

ad. OrderedDict: you can make a list comprehension of tuples (key, value) and pass it (the list) to a OrderedDict constructor

[konstantin]

Thank you ! it's very usefull for me.

[schogaia]

You should switch to fstrings, much easier to read than the % way

Other than that: great video

[MadLadsAnonymous]

Hi, Sebastiaan.
Am just learning Python and came across this and your previous 7 Tricks video--both excellent! I wish most Python courses just taught us these tricks from the beginning so our code would look cleaner and run faster.

re: DefaultDict vs Counter

What's the difference?

Your dict has the values as counts already, right? So if we want the count, we look for the key. But if key doesn't exist and we know the k, v pair, we can just add a default item to dict. So, what's the point of the Counter, especially since dicts can only have unique keys? I heard something about a single item default add (using the lambda notation) vs a "larger dict, " but still confused.

Cheers!

[zzphantom]

dict(zip(map(string.capwords, cities), populations))

[harshteck]

OrderedDictionary is useful but it's a double linked list. So it uses double the size of a regular dictionary. Any other way??

[elmirach]

Not sure if the trick with learning which version of python you're using is the most important thing to learn that you needed to put it as trick #1 towards better programming