replace generators with a deducer

[arlor]

replace various generators with one deducer

[thautwarm]

I'm sorry for my offline these days(I'm busy with my final exams).
Thanks again for your PR, however, check it to pass CI, please.
Your Bug Here

[coveralls]

Coverage decreased (-0.06%) to 93.333% when pulling e237ecd on Athedorer:master into 55e8ed3 on Xython:master.

[codecov-io]

Codecov Report

Merging #5 into master will decrease coverage by 0.18%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master      #5      +/-   ##
=========================================
- Coverage   88.48%   88.3%   -0.19%     
=========================================
  Files           9       9              
  Lines         330     342      +12     
  Branches       62      69       +7     
=========================================
+ Hits          292     302      +10     
- Misses         22      23       +1     
- Partials       16      17       +1

Impacted Files	Coverage Δ
after/linq/standard/generator.py	100% <0%> (ø)	⬆️
after/linq/core/collections.py	67.64% <0%> (+6.77%)	⬆️

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