really drop python<=3.7 support

[kloczek]

Filter all code over pyupgrade --py38-plus.

[kloczek]

My PR not messed with that line on which point plint

[brunato]

Sorry but too many changes in so many files to be merged in the master branch.
Also I agree with some changes (e.g. set() constructors) but not others (e.g. C-style formatted strings replaced by format() in some cases).

I could agree for a merge in the develop branch for a limited set of cases (set, super, ...).

Thank you

[kloczek]

Sorry but too many changes in so many files to be merged in the master branch.

All those changes has been generated automatically by pyupgrade --py38-plus.
You can install pyupgrade and execute find . -name\*.py | xargs pyupgrade --py38-plus and you will have exactly the same patch.

[brunato]

Sorry but too many changes in so many files to be merged in the master branch.

All those changes has been generated automatically by pyupgrade --py38-plus. You can install pyupgrade and execute find . -name\*.py | xargs pyupgrade --py38-plus and you will have exactly the same patch.

I understood that, but in development, not in master branch.

I saw that pyupgrade doesn't have so many exception options, anyway i will try it during development.

Dropping Python 3.7 doesn't mean necessarily that all the codebase is Py38+. In this case the compatibility is dropped mainly by the usage of protocols defined in the base package elementpath.

Thank you

[kloczek]

OK I understand.
You know what to do and how.
Just please do that when you will have time.

[brunato]

Tested on develop. Two things:

1. The code produced with pyupgrade --py38-plus is exactly the same produced with pyupgrade --py37-plus
2. Some strings are not translated neither if it's possible, maybe pyupgrade gets confused sometimes when the value includes quotes or round brackets.

[brunato]

Also found a bug applying to a module in elementpath. A for-yield is replaced with a yield from despite the variable is an instance attribute:

diff --git a/elementpath/xpath_context.py b/elementpath/xpath_context.py
index 3b16ee9..483bb85 100644
--- a/elementpath/xpath_context.py
+++ b/elementpath/xpath_context.py
@@ -386,8 +386,7 @@ class XPathContext:
             status = self.item, self.axis
             self.axis = 'attribute'
 
-            for self.item in self.item.attributes:
-                yield self.item
+            yield from self.item.attributes
 
             self.item, self.axis = status

[kloczek]

Also found a bug applying to a module in elementpath. A for-yield is replaced with a yield from despite the variable is an instance attribute:

Just open the ticket in pyupgrade.