Make GrafanaApi(auth=) an optional argument

This makes it easier to connect to Grafana instances that do not require
authentication.

CHANGELOG.md

@@ -3,6 +3,12 @@
 ## in progress
 
 
+## 2.3.0 (2022-05-26)
+
+* Make `GrafanaApi(auth=)` an optional argument. This makes it easier to
+  connect to Grafana instances that do not require authentication.
+
+
 ## 2.2.1 (2022-05-20)
 
 * Fix annotations query string parameter `dashboardId`. Thanks, @richbon75!

grafana_client/api.py

@@ -20,7 +20,7 @@
 class GrafanaApi:
     def __init__(
         self,
-        auth,
+        auth=None,
         host="localhost",
         port=None,
         url_path_prefix="",

grafana_client/client.py

@@ -91,10 +91,11 @@ def construct_api_url():
         self.url = construct_api_url()
 
         self.s = requests.Session()
-        if not isinstance(self.auth, tuple):
-            self.auth = TokenAuth(self.auth)
-        else:
-            self.auth = requests.auth.HTTPBasicAuth(*self.auth)
+        if self.auth is not None:
+            if not isinstance(self.auth, tuple):
+                self.auth = TokenAuth(self.auth)
+            else:
+                self.auth = requests.auth.HTTPBasicAuth(*self.auth)
 
     def __getattr__(self, item):
         def __request_runnner(url, json=None, headers=None):