Fix for Unused global variable (#824)

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Author: Andrey1994

python_package/examples/tests/eego_impedances_and_eeg.py

@@ -17,7 +17,7 @@
     # Get impedance data
     board.config_board('impedance_mode:1')
     board.start_stream()
-    for i in range(5):
+    for _ in range(5):
         time.sleep(1)
         data = board.get_board_data()  # get all data and remove it from internal buffer
         print(f'{data.shape[0]} channels x {data.shape[1]} samples')
@@ -26,7 +26,7 @@
     # Get EEG data
     board.config_board('impedance_mode:0')
     board.start_stream()
-    for i in range(3):
+    for _ in range(3):
         time.sleep(1)
         data = board.get_board_data()  # get all data and remove it from internal buffer
         print(f'{data.shape[0]} channels x {data.shape[1]} samples')