pylint fix

Author: terriko

adafruit_rfm9x.py

@@ -363,8 +363,8 @@ def __init__(self, spi, cs, reset, frequency, *, preamble_length=8,
         # No device type check!  Catch an error from the very first request and
         # throw a nicer message to indicate possible wiring problems.
         version = self._read_u8(_RH_RF95_REG_42_VERSION)
-        if (version != 18):
-            raise RuntimeError('failed to find rfm9x with expected version -- check wiring')
+        if version != 18:
+            raise RuntimeError('Failed to find rfm9x with expected version -- check wiring')
 
         # Set sleep mode, wait 10s and confirm in sleep mode (basic device check).
         # Also set long range mode (LoRa mode) as it can only be done in sleep.
@@ -497,8 +497,8 @@ def frequency_mhz(self):
 
     @frequency_mhz.setter
     def frequency_mhz(self, val):
-        if (val < 240 or val > 960):
-            raise RuntimeError("Frequency must be between 240 and 960")
+        if val < 240 or val > 960:
+            raise RuntimeError('frequency_mhz must be between 240 and 960')
         # Calculate FRF register 24-bit value.
         frf = int((val * 1000000.0) / _RH_RF95_FSTEP) & 0xFFFFFF
         # Extract byte values and update registers.
@@ -529,7 +529,7 @@ def tx_power(self, val):
         val = int(val)
         if self.high_power:
             if val < 5 or val > 23:
-                raise RuntimeError("tx_power must be between 5 and 23")
+                raise RuntimeError('tx_power must be between 5 and 23')
             # Enable power amp DAC if power is above 20 dB.
             # Lower setting by 3db when PA_BOOST enabled - see Data Sheet  Section 6.4
             if val > 20: