Use pip to get Python dependencies

README.md

@@ -488,7 +488,23 @@ Note that, in order to better leverage ClearlyDefined data, the "v" should **not
 
 ### Example Python
 
-Use the `requirements.txt` file that's generated by the compiler to check dependencies:
+You can use `pip` and a `requirements.txt` (or similar) file to check Python dependencies:
+
+```
+pip install -r requirements.txt --dry-run \
+| grep -Poh "(?<=^Would install ).*$" | grep -oP '[^\s]+' \
+| sed -E -e 's|(.+)\-([a-zA-Z0-9\.]+)|pypi/pypi/-/\1/\2|' \
+| java -jar/dash-licenses/org.eclipse.dash.licenses-<version>.jar -
+````
+
+Steps:
+
+1. Do a dry-run install with `pip` feeding it with your requirements file;
+2. Extract the "Would install" line from the results and dump the libraries on separate lines;
+3. Map each line to a ClearlyDefined ID; and
+4. Invoke the tool.
+
+Very often, you can get away with `grep`ing the `requirements.txt` file check dependencies (if there's some reason why you can't use `pip`):
 
 ```
 cat requirements.txt | grep -v \# \