diff --git a/port/arduino/docs/update_apis.py b/port/arduino/docs/update_apis.py
index ae3dc7d2f..7abcf3ef9 100755
--- a/port/arduino/docs/update_apis.py
+++ b/port/arduino/docs/update_apis.py
@@ -37,7 +37,7 @@ def replacePlaceholder(template, title, lable):
 def writeAPI(fout, infile_name):
     global code_identation
     state = State.SearchStartAPI
-    with open(infile_name, 'rb') as fin:
+    with open(infile_name, 'r') as fin:
         for line in fin:
             if state == State.SearchStartAPI:
                 parts = re.match('\s*(/\*).*API_START.*(\*/)',line)
diff --git a/port/arduino/docs/update_listings.py b/port/arduino/docs/update_listings.py
index 215464071..9a03740e6 100755
--- a/port/arduino/docs/update_listings.py
+++ b/port/arduino/docs/update_listings.py
@@ -111,7 +111,7 @@ def processTextLine(line, ref_prefix):
 
 def getExampleTitle(example_path):
     example_title = ''
-    with open(example_path, 'rb') as fin:
+    with open(example_path, 'r') as fin:
         for line in fin:
             parts = re.match('.*(EXAMPLE_START)\((.*)\):\s*(.*)(\*/)?\n',line)
             if parts: 
@@ -151,7 +151,7 @@ def writeListings(aout, infile_name, ref_prefix):
     code_identation = "    "
     skip_code = 0
 
-    with open(infile_name, 'rb') as fin:
+    with open(infile_name, 'r') as fin:
         for line in fin:
             if state == State.SearchExampleStart:
                 parts = re.match('.*(EXAMPLE_START)\((.*)\):\s*(.*)(\*/)?\n',line)
@@ -267,12 +267,12 @@ def writeListings(aout, infile_name, ref_prefix):
 def processExamples(intro_file, examples_folder, examples_ofile):
     with open(examples_ofile, 'w') as aout:
 
-        with open(intro_file, 'rb') as fin:
+        with open(intro_file, 'r') as fin:
             for line in fin:
                 aout.write(line)
 
         for group_title in list_of_groups:
-            if not list_of_examples.has_key(group_title): continue
+            if not group_title in list_of_examples.keys(): continue
             examples = list_of_examples[group_title]
             for example in examples:
                 example_path  = examples_folder + example[0] + "/" + example[0] + ".ino"
@@ -283,7 +283,7 @@ def processExamples(intro_file, examples_folder, examples_ofile):
         aout.write("\n\n");
 
         for group_title in list_of_groups:
-            if not list_of_examples.has_key(group_title): continue
+            if not group_title in list_of_examples.keys(): continue
             examples = list_of_examples[group_title]
             
             group_title = group_title + " example"
@@ -301,7 +301,7 @@ def processExamples(intro_file, examples_folder, examples_ofile):
         aout.write("\n")
 
         for group_title in list_of_groups:
-            if not list_of_examples.has_key(group_title): continue
+            if not group_title in list_of_examples.keys(): continue
             examples = list_of_examples[group_title]
             
             for example in examples:
diff --git a/tool/btstack_rtos_generator.py b/tool/btstack_rtos_generator.py
index 8bc173740..692069ddc 100755
--- a/tool/btstack_rtos_generator.py
+++ b/tool/btstack_rtos_generator.py
@@ -261,7 +261,7 @@ def create_wrapper(fout, type_and_name, arg_string, need_lock):
     num_functions += 1
 
 def write_wrappers_for_file(fout, file, header_name, need_lock):
-    with open(file, 'rb') as fin:
+    with open(file, 'r') as fin:
         typedefFound = 0
         multiline_function_def = 0
         multiline = ''