Added target accuracy in init function of VNA

Python_script/VNA.py

 #!/usr/bin/python3
 
 import pyvisa
-from VNA_dummy import VnaDummy
+import VNA_dummy
 
 
-def create_vna(hostname):
+def create_vna(hostname, target_accuracy):
     if hostname == 'localhost':
-        return VnaDummy(hostname)
+        return VNA_dummy.get_vna_dummy(target_accuracy)
     else:
-        return Vna(hostname)
+        return Vna(hostname, target_accuracy)
 
 
 class Vna:
-    def __init__(self, ip_address):
+    def __init__(self, ip_address, target_accuracy):
         """
                 Implements the basic operation of the VNA
 
@@ -21,6 +21,7 @@ class Vna:
 
         # store the credentials so that methods can access them
         self.__ip_address = ip_address
+        self.target_accuracy = target_accuracy
 
         # we try to connect to the VNA just to see if there is an error
         self.rm = pyvisa.ResourceManager()