examples: python bindings and hkp4py updates

* Mostly tightening up the details on the hkp4py example script.
* Also fixed a typo in the LGPL boiler plate text included in all the
  other example scripts for the HOWTO.

doc/gpgme-python-howto.texi

@@ -843,12 +843,19 @@ importing of the keys found.
 @example
 import gpg
 import hkp4py
+import sys
 
 c = gpg.Context()
-server = hkp4py.KeyServer("https://hkps.pool.sks-keyservers.net")
+server = hkp4py.KeyServer("hkps://hkps.pool.sks-keyservers.net")
-pattern = input("Enter the pattern to search for keys or user IDs: ")
 results = []
 
+if len(sys.argv) > 2:
+    pattern = " ".join(sys.argv[1:])
+elif len(sys.argv) == 2:
+    pattern = sys.argv[1]
+else:
+    pattern = input("Enter the pattern to search for keys or user IDs: ")
+
 try:
     keys = server.search(pattern)
     print("Found @{0@} key(s).".format(len(keys)))
@@ -2377,6 +2384,11 @@ Without that recent addition it would have been necessary to encode
 the contents of each @samp{hkp4py.KeyServer().search()[i].key} in
 @samp{hkp4py.KeyServer().search()} before trying to import it.
 
+An example of this is included in the @ref{Importing keys, , Importing Keys} section of this
+HOWTO and the corresponding executable version of that example is
+available in the @samp{lang/python/examples/howto} directory as normal; the
+executable version is the @samp{import-keys-hkp.py} file.
+
 @node Copyright and Licensing
 @chapter Copyright and Licensing
 

lang/python/docs/gpgme-python-howto.org

@@ -2288,6 +2288,10 @@ Without that recent addition it would have been necessary to encode
 the contents of each =hkp4py.KeyServer().search()[i].key= in
 =hkp4py.KeyServer().search()= before trying to import it.
 
+An example of this is included in the [[#howto-import-key][Importing Keys]] section of this
+HOWTO and the corresponding executable version of that example is
+available in the =lang/python/examples/howto= directory as normal; the
+executable version is the =import-keys-hkp.py= file.
 
 
 * Copyright and Licensing