Everyday Standard Library Tools

Your learning sequence

1. 1 Count Repeated Values with Counter Read
2. 2 Not solved yet.○ Count N-Grams and Break Ties with Counter Practice · Easy
3. 3 Handle Missing Keys with get, setdefault and defaultdict Read
4. 4 Not solved yet.○ Group Rows by Key and Return a Plain dict Practice · Easy
5. 5 Queues and Sliding Windows with deque Read
6. 6 Not solved yet.○ Compute a Rolling Median with a Bounded deque Practice · Medium
7. 7 Priority Queues, Sorted Lists and Summary Statistics Read
8. 8 Not solved yet.○ Build a Task Queue That Keeps Arrival Order for Ties Practice · Medium
9. 9 Layer Configuration with ChainMap Read
10. 10 Not solved yet.○ Resolve a Setting and Report the Layer It Came From Practice · Medium
11. 11 When to Use OrderedDict Instead of dict Read
12. 12 Generators and One-Shot Iterators Read
13. 13 Not solved yet.○ Find the First Error with a Generator Practice · Easy
14. 14 Take the First Few Items with chain and islice Read
15. 15 Not solved yet.○ Take n Items Across Chunks Without Reading Ahead Practice · Easy
16. 16 Group Adjacent Items with groupby Read
17. 17 Not solved yet.○ Count and Total Rows per Key with groupby Practice · Medium
18. 18 Split a Stream into Batches with batched Read
19. 19 Not solved yet.○ Page Records and Check the Size at Call Time Practice · Easy
20. 20 Adjacent Pairs and Running Totals with pairwise and accumulate Read
21. 21 Not solved yet.○ Find the Largest Drop from a Running Peak Practice · Easy
22. 22 Split an Iterator with tee and Combine Inputs with product Read
23. 23 Repeat, Pad and Filter Streams with itertools Read
24. 24 Reuse Earlier Results with cache and lru_cache Read
25. 25 Not solved yet.○ Speed Up Edit Distance with a Cached Helper Practice · Medium
26. 26 Cache Method Results Without Keeping Objects Alive Read
27. 27 Not solved yet.○ Give Each Object Its Own Cache Practice · Medium
28. 28 Compute an Attribute Once with cached_property Read
29. 29 Not solved yet.○ Cache a Report Total Until You Clear It Practice · Medium
30. 30 Choose a Function by Argument Type with singledispatch Read
31. 31 Not solved yet.○ Build a JSON Converter Other Code Can Extend Practice · Hard
32. 32 Write Typed Decorators with wraps and ParamSpec Read
33. 33 Preset Arguments with partial and partialmethod Read
34. 34 Not solved yet.○ Retry a Flaky Call and Preset Arguments with partial Practice · Medium
35. 35 Combine a List into One Value with reduce Read
36. 36 Make Objects Sortable with total_ordering Read
37. 37 Not solved yet.○ Sort Version Strings with Pre-Releases First Practice · Medium
38. 38 Write a Context Manager with a Generator Read
39. 39 Not solved yet.○ Change an Attribute for One Block and Put It Back Practice · Medium
40. 40 Clean Up Any Number of Resources with ExitStack Read
41. 41 Not solved yet.○ Open a List of Resources and Close Them All Practice · Hard
42. 42 Small contextlib Helpers for Cleanup and Expected Errors Read
43. 43 Not solved yet.○ Close a Stream Only If You Opened It Practice · Easy
44. 44 Join Paths Safely with pathlib Read
45. 45 Not solved yet.○ Keep a Joined Path Inside Its Root Folder Practice · Easy
46. 46 Walk a Directory Tree and Skip Folders Read
47. 47 Not solved yet.○ Find Large Files Without Entering Skipped Folders Practice · Medium
48. 48 Replace String Constants with StrEnum Read
49. 49 Not solved yet.○ Migrate a Status Enum to StrEnum Practice · Medium
50. 50 Combine Permission Bits with Flag Read
51. 51 Not solved yet.○ Decode a Three-Bit Permission Mask Practice · Medium
52. 52 Read and Check a TOML Config File Read
53. 53 Not solved yet.○ Load a Server Config and Report the First Bad Setting Practice · Medium
54. 54 Store Times in UTC and Schedule in Local Time Read
55. 55 Not solved yet.○ Find the Next Daily Run in a Time Zone Practice · Hard

from enum import Enum

class Col(Enum):
    R = 1

print(Col.R is Col(1))
print(Col.R == 1)