[Rpm-maint] [rpm-software-management/rpm] Add real-life examples of Python RPM (PR #3177)

[Jakub Kadlčík]

@FrostyX commented on this pull request.



> @@ -0,0 +1,15 @@
+#!/usr/bin/python3
+
+# Install a package from a file stored on your system.
+# A Python equivalent for `rpm -i hello-2.12.1-4.fc40.x86_64.rpm`
+
+import os
+import rpm
+
+ts = rpm.TransactionSet()
+path = "/tmp/hello-2.12.1-4.fc40.x86_64.rpm"
+with open(path, "r") as fp:
+    filename = os.path.basename(path)
+    hdr = ts.hdrFromFdno(fp.fileno())
+    ts.addInstall(hdr, filename, "i")
+ts.run(lambda *args: print(args), {})

I have never actually installed anything through the Python API in real life, so I am not sure what the `ts.run` arguments should be. Same for the erasing example above.

Also, this script fails with

```
# FIXME this snippet fails with
TypeError: 'NoneType' object cannot be interpreted as an integer
FATAL ERROR: python callback ??? failed, aborting!
```

Can you please help me finish this example?

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