prelocate data in array

Author: andrewqian2001datadog

datadog/dogstatsd/max_sample_metric.py

@@ -10,7 +10,7 @@ def __init__(self, name, tags, metric_type, specified_rate=1.0, max_metric_sampl
         self.metric_type = metric_type
         self.max_metric_samples = max_metric_samples
         self.specified_rate = specified_rate
-        self.data = []
+        self.data = [None] * max_metric_samples if max_metric_samples > 0 else []
         self.stored_metric_samples = 0
         self.total_metric_samples = 0