Add license expression data from pypi API (#207)

Signed-off-by: Tushar Goel <tushar.goel.dav@gmail.com>

Author: TG1999

src/python_inspector/package_data.py

@@ -93,6 +93,7 @@ def get_pypi_data_from_purl(
             api_data_url=api_url,
             bug_tracking_url=bug_tracking_url,
             code_view_url=code_view_url,
+            license_expression=info.get("license_expression"),
             declared_license=get_declared_license(info),
             download_url=dist_url,
             size=url.get("size"),

tests/data/example-requirements-ignore-errors-expected.json

@@ -257,7 +257,7 @@
       "code_view_url": null,
       "vcs_url": null,
       "copyright": null,
-      "license_expression": null,
+      "license_expression": "MIT",
       "declared_license": {
         "classifiers": [
           "License :: OSI Approved :: MIT License"
@@ -321,7 +321,7 @@
       "code_view_url": null,
       "vcs_url": null,
       "copyright": null,
-      "license_expression": null,
+      "license_expression": "MIT",
       "declared_license": {
         "classifiers": [
           "License :: OSI Approved :: MIT License"