[mod] #160: examples: Allow to pass files path in f() prompt as arg

Reduce usage message
Add missing exits

examples/load_binary_encrypted_message.py

@@ -21,14 +21,11 @@ import sys
 from duniterpy.key import SigningKey
 
 
-def load_binary_encrypted_message():
+def load_binary_encrypted_message(signed_message_path=None):
+    if not signed_message_path:
         if len(sys.argv) < 2:
-        print(
-            """
-        Usage:
-            python decrypt_message.py ENCRYPTED_MESSAGE_FILEPATH
-        """
-        )
+            print("Usage: python decrypt_message.py ENCRYPTED_MESSAGE_FILEPATH")
+            sys.exit(1)
 
         # capture encrypted message filepath argument
         signed_message_path = sys.argv[1]

examples/load_binary_signed_message.py

@@ -19,14 +19,11 @@ import sys
 
 from duniterpy.key import VerifyingKey
 
-def load_binary_signed_message():
+def load_binary_signed_message(signed_message_path=None):
+    if not signed_message_path:
         if len(sys.argv) < 2:
-        print(
-            """
-        Usage:
-            python verify_signed_message.py SIGNED_MESSAGE_FILEPATH
-        """
-        )
+            print("Usage: python verify_signed_message.py SIGNED_MESSAGE_FILEPATH")
+            sys.exit(1)
 
         # capture signed message filepath argument
         signed_message_path = sys.argv[1]

examples/load_credentials_file.py

@@ -19,7 +19,8 @@ import sys
 
 from duniterpy.key import SigningKey
 
-def load_credentials_file():
+def load_credentials_file(credentials_filepath=None):
+    if not credentials_filepath:
         if len(sys.argv) < 2:
             print("Usage: python load_credentials_file.py FILEPATH")
             sys.exit(1)

examples/load_scuttlebutt_file.py

@@ -19,7 +19,8 @@ import sys
 
 from duniterpy.key import SigningKey
 
-def load_scuttlebutt_file():
+def load_scuttlebutt_file(scuttlebutt_filepath=None):
+    if not scuttlebutt_filepath:
         if len(sys.argv) < 2:
             print("Usage: python load_scuttlebutt_file.py FILEPATH")
             sys.exit(1)