Upgrade pyo3 to 0.16 (#956)

* Upgrade pyo3 to 0.15

Rebase-conflicts-fixed-by: H. Vetinari <h.vetinari@gmx.com>

* Upgrade pyo3 to 0.16

Rebase-conflicts-fixed-by: H. Vetinari <h.vetinari@gmx.com>

* Install Python before running cargo clippy

* Fix clippy warnings

* Use `PyArray_Check` instead of downcasting to `PyArray1<u8>`

* Enable `auto-initialize` of pyo3 to fix `cargo test
--no-default-features`

* Fix some test cases

Why do they change?

* Refactor and add SAFETY comments to `PyArrayUnicode`

Replace deprecated `PyUnicode_FromUnicode` with `PyUnicode_FromKindAndData`

Co-authored-by: messense <messense@icloud.com>

.github/workflows/python.yml

@@ -63,6 +63,13 @@ jobs:
           toolchain: stable
           components: rustfmt, clippy
 
+      - name: Install Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.9
+          architecture: "x64"
+
+
       - name: Cache Cargo Registry
         uses: actions/cache@v1
         with:
@@ -88,12 +95,6 @@ jobs:
           command: clippy
           args: --manifest-path ./bindings/python/Cargo.toml --all-targets --all-features -- -D warnings
 
-      - name: Install Python
-        uses: actions/setup-python@v2
-        with:
-          python-version: 3.9
-          architecture: "x64"
-
       - name: Install
         working-directory: ./bindings/python
         run: |

bindings/python/.cargo/config.toml

@@ -11,4 +11,3 @@ rustflags = [
   "-C", "link-arg=dynamic_lookup",
   "-C", "link-arg=-mmacosx-version-min=10.11",
 ]
-