Drop python3.6 support

[koxudaxi]

No description provided.

[codecov]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage 👍

Coverage data is based on head (b47f6a6) compared to base (e9b6edf).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##            master      #887     +/-   ##
===========================================
  Coverage   100.00%   100.00%             
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  Files           11        14      +3     
  Lines         1020      2066   +1046     
  Branches       201       435    +234     
===========================================
+ Hits          1020      2066   +1046     

Flag	Coverage Δ
unittests	100.00% <100.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
datamodel_code_generator/__main__.py	100.00% <100.00%> (ø)
datamodel_code_generator/http.py	100.00% <100.00%> (ø)
datamodel_code_generator/model/base.py	100.00% <100.00%> (ø)
datamodel_code_generator/model/enum.py	100.00% <100.00%> (ø)
...amodel_code_generator/model/pydantic/base_model.py	100.00% <100.00%> (ø)
..._code_generator/model/pydantic/custom_root_type.py	100.00% <100.00%> (ø)
...tamodel_code_generator/model/pydantic/dataclass.py	100.00% <100.00%> (ø)
datamodel_code_generator/model/pydantic/imports.py	100.00% <100.00%> (ø)
datamodel_code_generator/model/pydantic/types.py	100.00% <100.00%> (ø)
datamodel_code_generator/parser/base.py	100.00% <100.00%> (ø)
... and 7 more

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[gjcarneiro]

I am working on a code base that runs onpython 3.6 still, and will not upgrade for some time. Is the intention to have the code generator itself require python >= 3.7 but generates code that still works on python 3.6? Or is the generated code no longer going to support 3.6?

[koxudaxi]

@gjcarneiro

Is the intention to have the code generator itself require python >= 3.7
Some libraries drop Python 3.6 support.
I don't want to keep complex dependency.

Also, I checked the download list.
I think Python 3.6 users are decreasing now.

but generates code that still works on python 3.6? Or is the generated code no longer going to support 3.6?

I would remove string annotation features like Optional['OriginalModel'] for Python3.6

But, If a few users need Python 3.6 support.
I will close the PR.

[gjcarneiro]

Would be great if you could generate code still compatible with Python 3.6, even if it needs to run on Python >= 3.7 now. But it's your call. Thanks!