12 files changed, 34 insertions, 32 deletions
diff --git a/tests/io/argv.py b/tests/io/argv.py
index a13f2cad2..53254da11 100644
--- a/tests/io/argv.py
+++ b/tests/io/argv.py
@@ -1,2 +1,3 @@
 import sys
+
 print(sys.argv)
diff --git a/tests/io/buffered_writer.py b/tests/io/buffered_writer.py
index c2cedb991..64e5fa1ee 100644
--- a/tests/io/buffered_writer.py
+++ b/tests/io/buffered_writer.py
@@ -4,7 +4,7 @@ try:
     io.BytesIO
     io.BufferedWriter
 except AttributeError:
-    print('SKIP')
+    print("SKIP")
     raise SystemExit
 
 bts = io.BytesIO()
diff --git a/tests/io/builtin_print_file.py b/tests/io/builtin_print_file.py
index d9b8e2a96..822356a6c 100644
--- a/tests/io/builtin_print_file.py
+++ b/tests/io/builtin_print_file.py
@@ -5,13 +5,13 @@ import sys
 try:
     sys.stdout
 except AttributeError:
-    print('SKIP')
+    print("SKIP")
     raise SystemExit
 
 print(file=sys.stdout)
-print('test', file=sys.stdout)
+print("test", file=sys.stdout)
 
 try:
     print(file=1)
-except (AttributeError, OSError): # CPython and uPy differ in error message
-    print('Error')
+except (AttributeError, OSError):  # CPython and uPy differ in error message
+    print("Error")
diff --git a/tests/io/file1.py b/tests/io/file1.py
index af4176b64..2a46c9c63 100644
--- a/tests/io/file1.py
+++ b/tests/io/file1.py
@@ -4,43 +4,43 @@ print(f.readline())
 print(f.read())
 f = open("io/data/file1")
 print(f.readlines())
-f = open("io/data/file1","r")
+f = open("io/data/file1", "r")
 print(f.readlines())
-f = open("io/data/file1","rb")
+f = open("io/data/file1", "rb")
 print(f.readlines())
-f = open("io/data/file1",mode="r")
+f = open("io/data/file1", mode="r")
 print(f.readlines())
-f = open("io/data/file1",mode="rb")
+f = open("io/data/file1", mode="rb")
 print(f.readlines())
 
 # write() error
-f = open('io/data/file1', 'r')
+f = open("io/data/file1", "r")
 try:
-    f.write('x')
+    f.write("x")
 except OSError:
-    print('OSError')
+    print("OSError")
 f.close()
 
 # read(n) error on binary file
-f = open('io/data/file1', 'ab')
+f = open("io/data/file1", "ab")
 try:
     f.read(1)
 except OSError:
-    print('OSError')
+    print("OSError")
 f.close()
 
 # read(n) error on text file
-f = open('io/data/file1', 'at')
+f = open("io/data/file1", "at")
 try:
     f.read(1)
 except OSError:
-    print('OSError')
+    print("OSError")
 f.close()
 
 # read() w/o args error
-f = open('io/data/file1', 'ab')
+f = open("io/data/file1", "ab")
 try:
     f.read()
 except OSError:
-    print('OSError')
+    print("OSError")
 f.close()
diff --git a/tests/io/file_readinto.py b/tests/io/file_readinto.py
index cbefc6e04..1f3702a21 100644
--- a/tests/io/file_readinto.py
+++ b/tests/io/file_readinto.py
@@ -7,8 +7,8 @@ print(f.readinto(b))
 print(b)
 
 # readinto() on writable file
-f = open('io/data/file1', 'ab')
+f = open("io/data/file1", "ab")
 try:
     f.readinto(bytearray(4))
 except OSError:
-    print('OSError')
+    print("OSError")
diff --git a/tests/io/file_readline.py b/tests/io/file_readline.py
index 25e76597b..86d010eaf 100644
--- a/tests/io/file_readline.py
+++ b/tests/io/file_readline.py
@@ -6,9 +6,9 @@ print(f.readline(5))
 print(f.readline())
 
 # readline() on writable file
-f = open('io/data/file1', 'ab')
+f = open("io/data/file1", "ab")
 try:
     f.readline()
 except OSError:
-    print('OSError')
+    print("OSError")
 f.close()
diff --git a/tests/io/file_seek.py b/tests/io/file_seek.py
index 10fb1fd06..2fe57692c 100644
--- a/tests/io/file_seek.py
+++ b/tests/io/file_seek.py
@@ -25,10 +25,10 @@ print(f.tell())
 f.close()
 
 # seek closed file
-f = open('io/data/file1', 'r')
+f = open("io/data/file1", "r")
 f.close()
 try:
     f.seek(1)
 except (OSError, ValueError):
     # CPy raises ValueError, uPy raises OSError
-    print('OSError or ValueError')
+    print("OSError or ValueError")
diff --git a/tests/io/file_with.py b/tests/io/file_with.py
index ee1e70242..899c0f928 100644
--- a/tests/io/file_with.py
+++ b/tests/io/file_with.py
@@ -15,7 +15,7 @@ except:
 # Regression test: test that exception in with initialization properly
 # thrown and doesn't crash.
 try:
-    with open('__non_existent', 'r'):
+    with open("__non_existent", "r"):
         pass
 except OSError:
     print("OSError")
diff --git a/tests/io/iobase.py b/tests/io/iobase.py
index 6f554b00f..667e62985 100644
--- a/tests/io/iobase.py
+++ b/tests/io/iobase.py
@@ -6,14 +6,15 @@ except:
 try:
     io.IOBase
 except AttributeError:
-    print('SKIP')
+    print("SKIP")
     raise SystemExit
 
 
 class MyIO(io.IOBase):
     def write(self, buf):
         # CPython and uPy pass in different types for buf (str vs bytearray)
-        print('write', len(buf))
+        print("write", len(buf))
         return len(buf)
 
-print('test', file=MyIO())
+
+print("test", file=MyIO())
diff --git a/tests/io/resource_stream.py b/tests/io/resource_stream.py
index 37d985bf1..5656205b6 100644
--- a/tests/io/resource_stream.py
+++ b/tests/io/resource_stream.py
@@ -4,7 +4,7 @@ import sys
 try:
     uio.resource_stream
 except AttributeError:
-    print('SKIP')
+    print("SKIP")
     raise SystemExit
 
 buf = uio.resource_stream("data", "file2")
diff --git a/tests/io/stringio1.py b/tests/io/stringio1.py
index 9f7c1e44e..6d8491754 100644
--- a/tests/io/stringio1.py
+++ b/tests/io/stringio1.py
@@ -4,7 +4,7 @@ except ImportError:
     import io
 
 a = io.StringIO()
-print('io.StringIO' in repr(a))
+print("io.StringIO" in repr(a))
 print(a.getvalue())
 print(a.read())
 
@@ -35,7 +35,7 @@ print(a.read())
 
 a = io.StringIO()
 a.close()
-for f in [a.read, a.getvalue, lambda:a.write("")]:
+for f in [a.read, a.getvalue, lambda: a.write("")]:
     # CPython throws for operations on closed I/O, MicroPython makes
     # the underlying string empty unless MICROPY_CPYTHON_COMPAT defined
     try:
diff --git a/tests/io/write_ext.py b/tests/io/write_ext.py
index 5a6eaa35c..18cd75ddb 100644
--- a/tests/io/write_ext.py
+++ b/tests/io/write_ext.py
@@ -5,7 +5,7 @@ import uio
 try:
     uio.BytesIO
 except AttributeError:
-    print('SKIP')
+    print("SKIP")
     raise SystemExit
 
 buf = uio.BytesIO()