diff --git a/libraries/AP_HAL_ChibiOS/hwdef/scripts/addfunc_parse.py b/libraries/AP_HAL_ChibiOS/hwdef/scripts/addfunc_parse.py
index 4f5ebc5a46..609814fe0e 100755
--- a/libraries/AP_HAL_ChibiOS/hwdef/scripts/addfunc_parse.py
+++ b/libraries/AP_HAL_ChibiOS/hwdef/scripts/addfunc_parse.py
@@ -28,7 +28,7 @@ def is_pin(str):
         return False
 
 def parse_adc_table(fname, table):
-    csvt = csv.reader(open(fname,'rb'))
+    csvt = csv.reader(open(fname,'r'))
     i = 0
     for row in csvt:
         for col in row:
diff --git a/libraries/AP_HAL_ChibiOS/hwdef/scripts/af_parse.py b/libraries/AP_HAL_ChibiOS/hwdef/scripts/af_parse.py
index b5940b9861..dd3b1774ea 100755
--- a/libraries/AP_HAL_ChibiOS/hwdef/scripts/af_parse.py
+++ b/libraries/AP_HAL_ChibiOS/hwdef/scripts/af_parse.py
@@ -86,10 +86,10 @@ if len(sys.argv) != 2:
 
 parse_af_table(sys.argv[1], table)
 
-sys.stdout.write("AltFunction_map = {\n");
+sys.stdout.write("AltFunction_map = {\n")
 sys.stdout.write('\t# format is PIN:FUNCTION : AFNUM\n')
 sys.stdout.write('\t# extracted from %s\n' % os.path.basename(sys.argv[1]))
 for k in sorted(table.keys(), key=cmp_to_key(pin_compare)):
     s = '"' + k + '"'
     sys.stdout.write('\t%-20s\t:\t%s,\n' % (s, table[k]))
-sys.stdout.write("}\n");
+sys.stdout.write("}\n")
diff --git a/libraries/AP_HAL_ChibiOS/hwdef/scripts/dma_parse.py b/libraries/AP_HAL_ChibiOS/hwdef/scripts/dma_parse.py
index d0edd0f57f..f4dbab8fd5 100755
--- a/libraries/AP_HAL_ChibiOS/hwdef/scripts/dma_parse.py
+++ b/libraries/AP_HAL_ChibiOS/hwdef/scripts/dma_parse.py
@@ -11,7 +11,7 @@ import sys, csv, os
 
 def parse_dma_table(fname, table):
     dma_num = 1
-    csvt = csv.reader(open(fname,'rb'))
+    csvt = csv.reader(open(fname,'r'))
     i = 0
     last_channel = -1
     for row in csvt:
@@ -78,7 +78,7 @@ sys.stdout.write("DMA_Map = {\n");
 sys.stdout.write('\t# format is (DMA_TABLE, StreamNum, Channel)\n')
 sys.stdout.write('\t# extracted from %s\n' % os.path.basename(sys.argv[1]))
 
-for k in sorted(table.iterkeys()):
+for k in sorted(table.keys()):
     s = '"%s"' % k
     sys.stdout.write('\t%-10s\t:\t[' % s)
     for i in range(len(table[k])):