improve README example code style

Author: Elias Nygren

README.md

@@ -71,54 +71,59 @@ You must take this into account in your automations.
 ### Defining and creating Servers
 
 ```python
+
 import upcloud_api
 from upcloud_api import Server, Storage, ZONE
 
-manager = upcloud_api.CloudManager("api_user", "password")
+manager = upcloud_api.CloudManager('api_user', 'password')
 manager.authenticate() # test credentials
 
 cluster = {
-	"web1": Server( core_number = 1, # CPU cores
-					memory_amount = 512, # RAM in MB
-					hostname = "web1.example.com",
-					zone = ZONE.London, # ZONE.Helsinki and ZONE.Chicago available also
-					storage_devices = [
-				        # OS: Ubuntu 14.04 from template
-				        # default tier: maxIOPS, the 100k IOPS storage backend
-						Storage(os = "Ubuntu 14.04", size=10),
-						# secondary storage, hdd for reduced cost
-						Storage(size=100, tier="hdd")
-					]),
-
-	"web2": Server( core_number = 1,
-					memory_amount = 512,
-					hostname = "web2.example.com",
-					zone = ZONE.London,
-					storage_devices = [
-						Storage(os = "Ubuntu 14.04", size=10),
-						Storage(size=100, tier="hdd"),
-					]),
-
-	"db":	Server( core_number = 2,
-					memory_amount = 2048,
-					hostname = "db.example.com",
-					zone = ZONE.London,
-					storage_devices = [
-						Storage(os = "Ubuntu 14.04", size=10),
-						Storage(size=100),
-					]),
-
-	"lb":	Server( core_number = 2,
-					memory_amount = 1024,
-					hostname = "balancer.example.com",
-					zone = ZONE.London,
-					storage_devices = [
-						Storage(os = "Ubuntu 14.04", size=10)
-					])
+    'web1': Server(
+        core_number = 1, # CPU cores
+        memory_amount = 512, # RAM in MB
+        hostname = 'web1.example.com',
+        zone = ZONE.London, # ZONE.Helsinki and ZONE.Chicago available also
+        storage_devices = [
+            # OS: Ubuntu 14.04 from template
+            # default tier: maxIOPS, the 100k IOPS storage backend
+            Storage(os = 'Ubuntu 14.04', size = 10),
+            # secondary storage, hdd for reduced cost
+            Storage(size = 100, tier = 'hdd')
+        ]
+    ),
+    'web2': Server(
+        core_number = 1,
+        memory_amount = 512,
+        hostname = 'web2.example.com',
+        zone = ZONE.London,
+        storage_devices = [
+            Storage(os = 'Ubuntu 14.04', size = 10),
+            Storage(size = 100, tier = 'hdd'),
+        ]
+    ),
+    'db': Server(
+        plan = '2xCPU-2GB' # use a preconfigured plan, instead of custom
+        hostname = 'db.example.com',
+        zone = ZONE.London,
+        storage_devices = [
+            Storage(os = 'Ubuntu 14.04', size = 10),
+            Storage(size = 100),
+        ]
+    ),
+    'lb': Server(
+        core_number = 2,
+        memory_amount = 1024,
+        hostname = 'balancer.example.com',
+        zone = ZONE.London,
+        storage_devices = [
+            Storage(os = 'Ubuntu 14.04', size = 10)
+        ]
+    )
 }
 
 for server in cluster:
-  manager.create_server( cluster[server] ) # automatically populates the Server objects with data from API
+  manager.create_server(cluster[server]) # automatically populates the Server objects with data from API
 
 ```