python: examples

* cut some of then poor len usage.

lang/python/examples/howto/add-userid.py

@@ -53,7 +53,7 @@ else:
 
 fpr = "".join(fpr0.split())
 
-if len(uid_cmnt) > 0:
+if uid_cmnt:
     userid = "{0} ({1}) <{2}>".format(uid_name, uid_cmnt, uid_email)
 else:
     userid = "{0} <{2}>".format(uid_name, uid_email)

lang/python/examples/howto/create-key.py

@@ -52,7 +52,7 @@ elif os.path.exists(homedir) is True:
 else:
     pass
 
-if len(uid_cmnt) > 0:
+if uid_cmnt:
     userid = "{0} ({1}) <{2}>".format(uid_name, uid_cmnt, uid_email)
 else:
     userid = "{0} <{2}>".format(uid_name, uid_email)

lang/python/examples/howto/revoke-userid.py

@@ -53,7 +53,7 @@ else:
 
 fpr = "".join(fpr0.split())
 
-if len(uid_cmnt) > 0:
+if uid_cmnt:
     userid = "{0} ({1}) <{2}>".format(uid_name, uid_cmnt, uid_email)
 else:
     userid = "{0} <{2}>".format(uid_name, uid_email)

lang/python/examples/howto/send-key-to-keyserver.py

@@ -49,7 +49,7 @@ else:
     logrus = input("Enter the UID matching the key(s) to export: ")
     homedir = input("Enter the GPG configuration directory path (optional): ")
 
-if len(homedir) == 0:
+if not homedir:
     homedir = None
 elif homedir.startswith("~"):
     userdir = os.path.expanduser(homedir)
@@ -73,7 +73,7 @@ if homedir is not None:
 else:
     pass
 
-if len(logrus) > 0:
+if logrus:
     try:
         export_result = c.key_export(pattern=logrus)
     except Exception as e:

lang/python/examples/howto/sign-key.py

@@ -53,11 +53,11 @@ else:
 fpr = "".join(fpr0.split())
 key = c.get_key(fpr, secret=False)
 
-if len(userid) > 0 and sig_type.lower() == "local":
+if userid and sig_type.lower() == "local":
     c.key_sign(key, uids=userid, local=True)
-elif len(userid) > 0 and sig_type.lower() != "local":
+elif userid and sig_type.lower() != "local":
     c.key_sign(key, uids=userid)
-elif len(userid) == 0 and sig_type.lower() == "local":
+elif not userid and sig_type.lower() == "local":
     c.key_sign(key, local=True)
 else:
     c.key_sign(key)