fix py streaming data example

examples/python/streaming_data.py

@@ -94,7 +94,7 @@ def master(count: int = 1, size: int = 32):
         buf_iter = 0  # iterator of payloads for the while loop
         failures = 0  # keep track of manual retries
         start_timer = time.monotonic() * 1000  # start timer
-        for buf_index in size:  # cycle through all payloads in stream
+        for buf_index in range(size):  # cycle through all payloads in stream
             while not radio.write(stream[buf_iter]):
                 # upload to TX FIFO failed because TX FIFO is full.
                 # check for transmission errors