PyPI Stats
ingolemo

lenses

A python lens library for manipulating deeply nested immutable structures
PyPI GitHub
Downloads
Day
5.3K
Week
40.3K
Month
259.9K
Stars
336
Forks
18
Issues
4
Version
1.2.0

Package Insights

What's this?
Score breakdown - each component scores 0–100, weighted by percentage
Maintenance
20
Popularity
48
Adoption
54
Community
10
How the maintenance status was determined
Last commit
903 days ago
Monthly downloads
259,901
Active
Activity within 30 days
Stable
Activity within 31-180 days
Minimal
Activity within 181-365 days, or no activity data
• At Risk
No activity for > 365 days, but > 10,000 monthly downloads
Archived
Repository flagged as archived on GitHub
How the popularity category was determined
Monthly downloads
259,901
Stars
336
Stars per 1k downloads
1.29
Industry Standard
> 10,000,000 monthly downloads
Hidden Gem
< 0.5 stars per 1k downloads and > 100,000 monthly downloads
Community Favorite
> 5 stars per 1k downloads
• Rising Star
Balanced ratio of stars to downloads
Unknown
Fewer than 1,000 monthly downloads, or no star data
How download momentum is calculated
Week daily avg
5,756
Month daily avg
8,663
Momentum
-33.6%
((week_daily_avg - month_daily_avg) / month_daily_avg) * 100
Python version support tiers
requires_python
>=3.7, <4
Cutting Edge
Minimum supported version is 3.12 or newer
Modern
Minimum supported version is 3.9, 3.10, or 3.11
• Legacy
Supports 3.8 or older (or Python 2)
Unknown
No requires_python specified or unparseable
License categories
License
GPLv3+
Permissive
MIT, Apache, BSD, ISC, Unlicense, CC0, etc.
• Copyleft
GPL, LGPL, AGPL, MPL, EPL, etc.
Proprietary
Commercial, all rights reserved, custom EULAs
Unknown
No license specified, or none of the above match
How the release cadence was determined
Last release
925 days ago
Total releases
9
Releases/year
0.9
Rapid
Last release within 365 days and > 12 releases/year
Regular
Last release within 365 days
Slow
Last release 366-730 days ago
• Stalled
Last release > 730 days ago, or no releases
Unknown
No usable release date available
How contributor risk was determined
Contributors
9
Monthly downloads
259,901
High Load
≤ 2 contributors and ≥ 50,000 monthly downloads
Moderate Load
< 10 contributors and ≥ 500,000 monthly downloads
Low Load
< 25 contributors and ≥ 5,000,000 monthly downloads, or sole maintainer with ≥ 10,000 monthly downloads
• Balanced
Enough contributors for the package's popularity
Unknown
No contributor data available
Engagement
22
 
Issue Burden
11.9
per 1k stars
Discussions
0.0
per 1k stars
Fork Ratio
50.0%
contrib / forks
Stale Release
No
 
PR Velocity
Quiet
 

Weekly Downloads

GitHub Stars

Not all downloads include detailed metadata. Breakdowns reflect the subset that does.

Downloads by OS

Linux 3.5K
Windows 7

Python Versions

3.11
98.1% 3.4K
3.13
0.6% 20
3.9
0.6% 20
3.12
0.4% 15
3.8
0.3% 12

Top Countries

1. US US
3.3K
2. NL NL
285
3. JP JP
8
4. SG SG
7
5. CN CN
5
6. HK HK
2
7. IE IE
2
8. IN IN
2
9. RO RO
2
10. CA CA
1

Dependencies

0
12 optional dependencies

Used By

9

Package Information

License
GPLv3+
First Release
May 29, 2016
Last Release
2 years ago
Last Commit
2 years ago
Latest Version
1.2.0
Total Releases
9
Contributors
9
Open PRs
0
Archived
No
Author
Adrian Room
Python Versions
3 3.7 3.8 3.9 3.10 3.11
Wheels
py3
Keywords
lens lenses immutable functional optics
Topics
lens lenses functional-programming functional-optics python prism traversal immutable-datastructures immutable optics
Tracking Since
January 6, 2026
Data Updated
May 3, 2026
Data Freshness
Fresh

Links