diff --git a/tools/binctl b/tools/binctl
index e2ec91e8..8c1de50d 100755
--- a/tools/binctl
+++ b/tools/binctl
@@ -14,8 +14,9 @@ def sign_data(seckey, data):
     digest = pyblake2.blake2s(data).digest()
     return signkey.sign(digest)
 
+
 def format_sigmask(sigmask):
-    bits = [ str(b + 1) if sigmask & (1<<b) else '.' for b in range(8) ]
+    bits = [str(b + 1) if sigmask & (1 << b) else '.' for b in range(8)]
     return '0x%02x = [%s]' % (sigmask, ' '.join(bits))
 
 
@@ -67,10 +68,10 @@ class BinImage(object):
         print()
 
     def serialize_header(self, sig=True):
-        header = struct.pack('<4sIIIBBBB427s', \
-            self.magic, self.hdrlen, self.expiry, self.codelen, \
-            self.vmajor, self.vminor, self.vpatch, self.vbuild, \
-            self.reserved)
+        header = struct.pack('<4sIIIBBBB427s',
+                                self.magic, self.hdrlen, self.expiry, self.codelen,
+                                self.vmajor, self.vminor, self.vpatch, self.vbuild,
+                                self.reserved)
         if sig:
             header += struct.pack('<B64s', self.sigmask, self.sig)
         else:
@@ -94,7 +95,7 @@ class BinImage(object):
 class FirmwareImage(BinImage):
 
     def __init__(self, data, vhdrlen):
-        super(FirmwareImage, self).__init__(data[vhdrlen:], magic=b'TRZF', max_size=7*128*1024)
+        super(FirmwareImage, self).__init__(data[vhdrlen:], magic=b'TRZF', max_size=7 * 128 * 1024)
         self.vhdrlen = vhdrlen
         self.vheader = data[:vhdrlen]
 
@@ -104,10 +105,11 @@ class FirmwareImage(BinImage):
             f.write(self.serialize_header())
             f.write(self.code)
 
+
 class BootloaderImage(BinImage):
 
     def __init__(self, data):
-        super(BootloaderImage, self).__init__(data, magic=b'TRZB', max_size=64*1024 + 7*128*1024)
+        super(BootloaderImage, self).__init__(data, magic=b'TRZB', max_size=64 * 1024 + 7 * 128 * 1024)
 
 
 class VendorHeader(object):
@@ -140,7 +142,7 @@ class VendorHeader(object):
         p += self.vimg_len
         self.sigmask = data[p]
         p += 1
-        self.sig = data[p:p+64]
+        self.sig = data[p:p + 64]
         assert len(data) == 4 + 4 + 4 + 1 + 1 + 1 + 1 + \
                             32 * len(self.vpub) + \
                             1 + self.vstr_len + vstr_pad + \
@@ -162,14 +164,14 @@ class VendorHeader(object):
         print('  * sig     :', binascii.hexlify(self.sig).decode('ascii'))
 
     def serialize_header(self, sig=True):
-        header = struct.pack('<4sIIBBBB', \
-            self.magic, self.hdrlen, self.expiry, \
-            self.vmajor, self.vminor, \
-            self.vsig_m, self.vsig_n)
+        header = struct.pack('<4sIIBBBB',
+                               self.magic, self.hdrlen, self.expiry,
+                               self.vmajor, self.vminor,
+                               self.vsig_m, self.vsig_n)
         for i in range(self.vsig_n):
             header += self.vpub[i]
         header += struct.pack('<B', self.vstr_len) + self.vstr
-        header += (-len(header) & 3) * b'\x00' # vstr_pad
+        header += (-len(header) & 3) * b'\x00'  # vstr_pad
         header += self.vimg
         if sig:
             header += struct.pack('<B64s', self.sigmask, self.sig)
@@ -205,6 +207,7 @@ def binopen(filename):
         return FirmwareImage(data, 0)
     raise Exception('Unknown file format')
 
+
 def main():
     if len(sys.argv) < 2:
         print('Usage: binctl file.bin [-s index seckey]')
diff --git a/tools/build_mocks b/tools/build_mocks
index 209c0a78..1ae3f3b0 100755
--- a/tools/build_mocks
+++ b/tools/build_mocks
@@ -107,6 +107,7 @@ def clear_directory(top_dir):
 
         os.rmdir(root)
 
+
 if __name__ == '__main__':
     clear_directory('../mocks/generated')
     build_directory('../embed/extmod', '../mocks/generated')
diff --git a/tools/build_vendorheader b/tools/build_vendorheader
index 3d80e02e..f55b08df 100755
--- a/tools/build_vendorheader
+++ b/tools/build_vendorheader
@@ -49,4 +49,5 @@ def main():
     with open(ofn, 'wb') as f:
         f.write(vheader)
 
+
 main()
diff --git a/tools/combine_firmware b/tools/combine_firmware
index b72514e7..c7947e5a 100755
--- a/tools/combine_firmware
+++ b/tools/combine_firmware
@@ -6,6 +6,7 @@ def pairwise(iterable):
     a = iter(iterable)
     return zip(a, a)
 
+
 files = sys.argv[1:]
 files = list(pairwise(files))
 
diff --git a/tools/ed25519raw.py b/tools/ed25519raw.py
index ec882568..2fd060a9 100644
--- a/tools/ed25519raw.py
+++ b/tools/ed25519raw.py
@@ -26,6 +26,7 @@ def expmod(b, e, m):
 def inv(x):
     return expmod(x, q - 2, q)
 
+
 d = -121665 * inv(121666)
 I = expmod(2, (q - 1) >> 2, q)
 
@@ -39,6 +40,7 @@ def xrecover(y):
         x = q - x
     return x
 
+
 By = 4 * inv(5)
 Bx = xrecover(By)
 B = [Bx % q, By % q]
diff --git a/tools/keytool b/tools/keytool
index 90995494..8688940e 100755
--- a/tools/keytool
+++ b/tools/keytool
@@ -77,7 +77,7 @@ def combinePubkeys(m, n):
         sum = None
         for j in range(0, n):
             if mask & (1 << j) != 0:
-                if sum == None:
+                if sum is None:
                     sum = pks[j]
                 else:
                     sum = ed25519raw.edwards(sum, pks[j])
@@ -88,9 +88,8 @@ def combinePubkeys(m, n):
 def get_nonce(sk, data, ctr):
     h = ed25519raw.H(sk)
     b = ed25519raw.b
-    a = 2**(b - 2) + sum(2**i * ed25519raw.bit(h, i) for i in range(3, b - 2))
-    r = ed25519raw.Hint(bytes([h[i] for i in range(b >> 3, b >> 2)]) + data +
-                        binascii.unhexlify("%08x" % ctr))
+    a = 2 ** (b - 2) + sum(2 ** i * ed25519raw.bit(h, i) for i in range(3, b - 2))
+    r = ed25519raw.Hint(bytes([h[i] for i in range(b >> 3, b >> 2)]) + data + binascii.unhexlify('%08x' % ctr))
     R = ed25519raw.scalarmult(ed25519raw.B, r)
     return (r, ed25519raw.encodepoint(R))
 
@@ -256,5 +255,6 @@ def test():
     ed25519raw.checkvalid(sig, digest, globalPk)
     print('Valid Signature!')
 
+
 if __name__ == '__main__':
     test()
diff --git a/tools/pb2py b/tools/pb2py
index e05bbcf8..c0546829 100755
--- a/tools/pb2py
+++ b/tools/pb2py
@@ -165,6 +165,7 @@ def write_to_file(genpath, t, out):
     f.write(data)
     f.close()
 
+
 if __name__ == '__main__':
     parser = argparse.ArgumentParser()
     parser.add_argument('modulename', type=str, help="Name of module to generate")
diff --git a/tools/png2toi b/tools/png2toi
index aa15975e..096b6cdc 100755
--- a/tools/png2toi
+++ b/tools/png2toi
@@ -56,7 +56,7 @@ def process_image(ifn, savefiles=False):
         pixeldata = process_grayscale(w, h, pix)
     z = zlib.compressobj(level=9, wbits=10)
     zdata = z.compress(pixeldata) + z.flush()
-    zdata = zdata[2:-4] # strip header and checksum
+    zdata = zdata[2:-4]  # strip header and checksum
 
     data = b''
     if im.mode == 'RGB':
diff --git a/tools/ttf2c b/tools/ttf2c
index ff6c41bc..09956ce9 100755
--- a/tools/ttf2c
+++ b/tools/ttf2c
@@ -46,6 +46,7 @@ def process_face(name, style, size):
             f.write('    Font_%s_%s_%d_glyph_%d,\n' % (name, style, size, i))
         f.write('};\n')
 
+
 process_face('Roboto', 'Regular', 20)
 process_face('Roboto', 'Bold', 20)
 process_face('RobotoMono', 'Regular', 20)