diff --git a/RaspberryPi_JetsonNano/python/examples/epd_2in7_V2_test.py b/RaspberryPi_JetsonNano/python/examples/epd_2in7_V2_test.py
index 629cf1bb..0cefe281 100644
--- a/RaspberryPi_JetsonNano/python/examples/epd_2in7_V2_test.py
+++ b/RaspberryPi_JetsonNano/python/examples/epd_2in7_V2_test.py
@@ -120,7 +120,7 @@
     
     '''4Gray display'''
     logging.info("4Gray display--------------------------------")
-    epd.Init_4Gray()
+    epd.init_4Gray()
     
     Limage = Image.new('L', (epd.width, epd.height), 0)  # 255: clear the frame
     draw = ImageDraw.Draw(Limage)
diff --git a/RaspberryPi_JetsonNano/python/examples/epd_2in7_test.py b/RaspberryPi_JetsonNano/python/examples/epd_2in7_test.py
index 138e24b4..bb58da0b 100644
--- a/RaspberryPi_JetsonNano/python/examples/epd_2in7_test.py
+++ b/RaspberryPi_JetsonNano/python/examples/epd_2in7_test.py
@@ -75,7 +75,7 @@
     
     '''4Gray display'''
     logging.info("4Gray display--------------------------------")
-    epd.Init_4Gray()
+    epd.init_4Gray()
     
     Limage = Image.new('L', (epd.width, epd.height), 0)  # 255: clear the frame
     draw = ImageDraw.Draw(Limage)
diff --git a/RaspberryPi_JetsonNano/python/examples/epd_2in9_V2_test.py b/RaspberryPi_JetsonNano/python/examples/epd_2in9_V2_test.py
index 24f69415..839168f4 100644
--- a/RaspberryPi_JetsonNano/python/examples/epd_2in9_V2_test.py
+++ b/RaspberryPi_JetsonNano/python/examples/epd_2in9_V2_test.py
@@ -96,7 +96,7 @@
 
     '''4Gray display'''
     logging.info("4Gray display--------------------------------")
-    epd.Init_4Gray()
+    epd.init_4Gray()
     
     Limage = Image.new('L', (epd.height, epd.width), 0)  # 255: clear the frame
     draw = ImageDraw.Draw(Limage)
diff --git a/RaspberryPi_JetsonNano/python/examples/epd_4in2_V2_test.py b/RaspberryPi_JetsonNano/python/examples/epd_4in2_V2_test.py
index 02b491ea..fa197b8e 100644
--- a/RaspberryPi_JetsonNano/python/examples/epd_4in2_V2_test.py
+++ b/RaspberryPi_JetsonNano/python/examples/epd_4in2_V2_test.py
@@ -144,7 +144,7 @@
             
     '''4Gray display'''
     logging.info("6.4Gray display--------------------------------")
-    epd.Init_4Gray()
+    epd.init_4Gray()
     
     Limage = Image.new('L', (epd.width, epd.height), 0)  # 255: clear the frame
     draw = ImageDraw.Draw(Limage)
diff --git a/RaspberryPi_JetsonNano/python/examples/epd_4in2_test.py b/RaspberryPi_JetsonNano/python/examples/epd_4in2_test.py
index d56b6ec7..f39f132c 100644
--- a/RaspberryPi_JetsonNano/python/examples/epd_4in2_test.py
+++ b/RaspberryPi_JetsonNano/python/examples/epd_4in2_test.py
@@ -94,7 +94,7 @@
     
     '''4Gray display'''
     logging.info("5.4Gray display--------------------------------")
-    epd.Init_4Gray()
+    epd.init_4Gray()
     
     Limage = Image.new('L', (epd.width, epd.height), 0)  # 255: clear the frame
     draw = ImageDraw.Draw(Limage)
diff --git a/RaspberryPi_JetsonNano/python/lib/waveshare_epd/epd2in7.py b/RaspberryPi_JetsonNano/python/lib/waveshare_epd/epd2in7.py
index 831492b6..24ecfc5a 100644
--- a/RaspberryPi_JetsonNano/python/lib/waveshare_epd/epd2in7.py
+++ b/RaspberryPi_JetsonNano/python/lib/waveshare_epd/epd2in7.py
@@ -295,6 +295,11 @@ def init(self):
         return 0
 
     def Init_4Gray(self):
+        logger.warning("The 'Init_4Gray' method is deprecated, use 'init_4Gray' instead")
+        return self.init_4Gray()
+
+
+    def init_4Gray(self):
         if (epdconfig.module_init() != 0):
             return -1
         self.reset()
diff --git a/RaspberryPi_JetsonNano/python/lib/waveshare_epd/epd2in7_V2.py b/RaspberryPi_JetsonNano/python/lib/waveshare_epd/epd2in7_V2.py
index 30074a6d..8257c63c 100644
--- a/RaspberryPi_JetsonNano/python/lib/waveshare_epd/epd2in7_V2.py
+++ b/RaspberryPi_JetsonNano/python/lib/waveshare_epd/epd2in7_V2.py
@@ -203,6 +203,11 @@ def init_Fast(self):
         return 0
 
     def Init_4Gray(self):
+        logger.warning("The 'Init_4Gray' method is deprecated, use 'init_4Gray' instead")
+        return self.init_4Gray()
+
+
+    def init_4Gray(self):
         if (epdconfig.module_init() != 0):
             return -1
         self.reset()
diff --git a/RaspberryPi_JetsonNano/python/lib/waveshare_epd/epd2in9_V2.py b/RaspberryPi_JetsonNano/python/lib/waveshare_epd/epd2in9_V2.py
index d84510b3..e5d8e8f6 100644
--- a/RaspberryPi_JetsonNano/python/lib/waveshare_epd/epd2in9_V2.py
+++ b/RaspberryPi_JetsonNano/python/lib/waveshare_epd/epd2in9_V2.py
@@ -291,6 +291,10 @@ def init_Fast(self):
         return 0
     
     def Init_4Gray(self):
+        logger.warning("The 'Init_4Gray' method is deprecated, use 'init_4Gray' instead")
+        return self.init_4Gray()
+
+    def init_4Gray(self):
         if (epdconfig.module_init() != 0):
             return -1
         self.reset()
diff --git a/RaspberryPi_JetsonNano/python/lib/waveshare_epd/epd3in7.py b/RaspberryPi_JetsonNano/python/lib/waveshare_epd/epd3in7.py
index 37685680..15fa5700 100644
--- a/RaspberryPi_JetsonNano/python/lib/waveshare_epd/epd3in7.py
+++ b/RaspberryPi_JetsonNano/python/lib/waveshare_epd/epd3in7.py
@@ -148,7 +148,7 @@ def ReadBusy(self):
         logger.debug("e-Paper busy release") 
 
 
-    def init(self, mode):
+    def init(self, mode=1):
         if (epdconfig.module_init() != 0):
             return -1
         # EPD hardware init start
@@ -422,7 +422,8 @@ def display_1Gray(self, image):
         self.ReadBusy()   
         
 
-    def Clear(self, color, mode):
+    '''The color argument is not supported on this screen.'''
+    def Clear(self, color, mode=1):
         self.send_command(0x4E)
         self.send_data(0x00)
         self.send_data(0x00)
diff --git a/RaspberryPi_JetsonNano/python/lib/waveshare_epd/epd4in2.py b/RaspberryPi_JetsonNano/python/lib/waveshare_epd/epd4in2.py
index ce1d057f..f5ebf447 100644
--- a/RaspberryPi_JetsonNano/python/lib/waveshare_epd/epd4in2.py
+++ b/RaspberryPi_JetsonNano/python/lib/waveshare_epd/epd4in2.py
@@ -394,6 +394,10 @@ def init_Partial(self):
         return 0
 
     def Init_4Gray(self):
+        logger.warning("The 'Init_4Gray' method is deprecated, use 'init_4Gray' instead")
+        return self.init_4Gray()
+
+    def init_4Gray(self):
         if epdconfig.module_init() != 0:
             return -1
         # EPD hardware init start
diff --git a/RaspberryPi_JetsonNano/python/lib/waveshare_epd/epd4in2_V2.py b/RaspberryPi_JetsonNano/python/lib/waveshare_epd/epd4in2_V2.py
index 105d57b2..20dd4765 100644
--- a/RaspberryPi_JetsonNano/python/lib/waveshare_epd/epd4in2_V2.py
+++ b/RaspberryPi_JetsonNano/python/lib/waveshare_epd/epd4in2_V2.py
@@ -264,9 +264,11 @@ def Lut(self):
         self.send_command(0x2c)
         self.send_data(self.LUT_ALL[232])
 
-    
-
     def Init_4Gray(self):
+        logger.warning("The 'Init_4Gray' method is deprecated, use 'init_4Gray' instead")
+        return self.init_4Gray()
+
+    def init_4Gray(self):
         if epdconfig.module_init() != 0:
             return -1
         # EPD hardware init start