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-rw-r--r--glucometerutils/drivers/fsoptium.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/glucometerutils/drivers/fsoptium.py b/glucometerutils/drivers/fsoptium.py
index 5c3971e..77244af 100644
--- a/glucometerutils/drivers/fsoptium.py
+++ b/glucometerutils/drivers/fsoptium.py
@@ -89,7 +89,7 @@ class Device(serial.SerialDevice, driver_base.GlucometerDriver):
DEFAULT_CABLE_ID = "1a61:3420"
def _send_command(self, command):
- cmd_bytes = bytes("$%s\r\n" % command, "ascii")
+ cmd_bytes = bytes(f"$%s\r\n" % command, "ascii")
logging.debug("Sending command: %r", cmd_bytes)
self.serial_.write(cmd_bytes)