Drop support for Python 2.7

[alimanfoo]

Python 2.7 is coming up to end of life. Many packages have dropped support. Proposing to drop Python 2.7 support for the next major version of petl.

[juarezr]

Also PIP is hammering another nail in the python2's coffin.

It's planned for in pip 21.0 (Jan 2021).

But I don't know how this impacts existing python2 packages.

[juarezr]

Statistics for Set/2020

Source

Install package ofek/pypinfo for querying pip download data.

Last 30 days

$ pypinfo petl
Served from cache: False
Data processed: 77.39 GiB
Data billed: 77.39 GiB
Estimated cost: $0.38

download_count
46,930

Last year

$ pypinfo --start-date 2019-09-16 --end-date 2020-09-16 --percent --all --markdown petl pyversion
Served from cache: False
Data processed: 925.38 GiB
Data billed: 925.38 GiB
Estimated cost: $4.52

python_version	percent	download_count
2.7	24.56%	95,957
3.6	22.41%	87,579
3.7	21.72%	84,889
3.8	14.95%	58,431
None	12.41%	48,487
3.4	2.16%	8,434
3.5	1.79%	6,984
2.6	0.00%	12
3.9	0.00%	8
3.3	0.00%	2
Total		390,783

Last 90 days

$ pypinfo --days 90 --markdown petl month percent2 percent3
Served from cache: False
Data processed: 449.58 GiB
Data billed: 449.58 GiB
Estimated cost: $2.20

download_month	percent_2	percent_3	download_count
2020-08	14.7	85.3	46,699
2020-07	19.5	80.5	33,202
2020-09	13.9	86.1	23,626
2020-06	22.6	77.4	9,525
Total			113,052

Last 100 days per version

$ pypinfo --days 100 --markdown petl version pyversion
Served from cache: False
Data processed: 493.03 GiB
Data billed: 493.03 GiB
Estimated cost: $2.41

version	python_version	download_count
1.3.0	3.8	48,385
0.25.3	2.7	10,250
1.2.0	3.6	9,091
1.1.1	2.7	8,470
1.3.0	3.7	6,317
1.2.0	3.7	5,282
1.3.0	3.6	4,209
1.6.2	3.6	2,838
1.6.2	3.8	2,435
1.6.2	3.7	2,344
Total		99,621

Last 30 days per version

$ pypinfo --days 30 --all --markdown petl system pyversion version
Served from cache: False
Data processed: 149.37 GiB
Data billed: 149.37 GiB
Estimated cost: $0.73

system_name	python_version	version	download_count
Linux	3.8	1.3.0	25,219
Linux	2.7	0.25.3	3,356
Linux	2.7	1.1.1	2,659
Linux	3.6	1.2.0	2,368
Linux	3.7	1.2.0	1,806
Linux	3.7	1.6.3	1,561
Linux	3.8	1.6.2	998
Linux	3.6	1.6.2	921
Linux	3.8	1.6.3	868
Linux	3.7	1.3.0	764
Total			40,520

Conclusions

• People using python2.7 are using old releases like 0.25.3 and 1.1.1.
• New releases 7,65% are using python versions 3.6, 3.7 and 3.8.
• Some suspicious info:
  • 1.3.0 + 3.8
  • Last 90 days total: 113,052
  • Last 100 days total: 99,621

[hugovk]

Please see PR #563.