Fix pandas warnings

Author: hugovk

src/stravavis/plot_dumbbell.py

@@ -40,11 +40,7 @@ def plot_dumbbell(
 
     # Get activity start and end times
     activities["start"] = activities["Activity Date"]
-    activities["duration"] = 0
-    for i in range(len(activities)):
-        activities["duration"][i] = pd.Timedelta(
-            activities["Elapsed Time"][i], unit="s"
-        )
+    activities["duration"] = pd.to_timedelta(activities["Elapsed Time"], unit="s")
     activities["end"] = pd.to_datetime(activities["start"] + activities["duration"])
 
     # Remove activities outside the year_min -> year_max window

src/stravavis/plot_landscape.py

@@ -19,8 +19,8 @@ def plot_landscape(df, output_file="landscape.png"):
     processed = []
 
     for activity in track(activities, "Processing tracks"):
-        df_i = df[df["name"] == activity]
-        df_i["dist_norm"] = (df_i["dist"] - df_i["dist"].min()) / (
+        df_i = df[df["name"] == activity].copy()
+        df_i.loc[:, "dist_norm"] = (df_i["dist"] - df_i["dist"].min()) / (
             df_i["dist"].max() - df_i["dist"].min()
         )
         processed.append(df_i)