black + remove unused imports

stegano/tools.py

@@ -27,16 +27,13 @@ __license__ = "GPLv3"
 
 import base64
 import itertools
-from typing import List, Iterator, Tuple, Union
 from functools import reduce
 from typing import IO, Iterator, List, Tuple, Union
 
 from PIL import Image
 
-ENCODINGS = {
-    'UTF-8': 8,
-    'UTF-32LE': 32
-}
+ENCODINGS = {"UTF-8": 8, "UTF-32LE": 32}
+
 
 def a2bits(chars: str) -> str:
     """Converts a string to its bits representation as a string of 0's and 1's.
@@ -44,9 +41,12 @@ def a2bits(chars: str) -> str:
     >>> a2bits("Hello World!")
     '010010000110010101101100011011000110111100100000010101110110111101110010011011000110010000100001'
     """
-    return bin(reduce(lambda x, y : (x<<8)+y, (ord(c) for c in chars), 1))[3:]
+    return bin(reduce(lambda x, y: (x << 8) + y, (ord(c) for c in chars), 1))[
+        3:
+    ]
 
-def a2bits_list(chars: str, encoding: str ='UTF-8') -> List[str]:
+
+def a2bits_list(chars: str, encoding: str = "UTF-8") -> List[str]:
     """Convert a string to its bits representation as a list of 0's and 1's.
 
     >>>  a2bits_list("Hello World!")
@@ -65,20 +65,24 @@ def a2bits_list(chars: str, encoding: str ='UTF-8') -> List[str]:
     >>> "".join(a2bits_list("Hello World!"))
     '010010000110010101101100011011000110111100100000010101110110111101110010011011000110010000100001'
     """
-    return [bin(ord(x))[2:].rjust(ENCODINGS[encoding],"0") for x in chars]
+    return [bin(ord(x))[2:].rjust(ENCODINGS[encoding], "0") for x in chars]
+
 
 def bs(s: int) -> str:
     """Converts an int to its bits representation as a string of 0's and 1's.
     """
-    return str(s) if s<=1 else bs(s>>1) + str(s&1)
+    return str(s) if s <= 1 else bs(s >> 1) + str(s & 1)
+
 
 def setlsb(component: int, bit: str) -> int:
     """Set Least Significant Bit of a colour component.
     """
     return component & ~1 | int(bit)
 
-def n_at_a_time(items: List[int], n: int, fillvalue: str) \
-        -> Iterator[Tuple[Union[int, str]]]:
+
+def n_at_a_time(
+    items: List[int], n: int, fillvalue: str
+) -> Iterator[Tuple[Union[int, str]]]:
     """Returns an iterator which groups n items at a time.
     Any final partial tuple will be padded with the fillvalue
 
@@ -88,6 +92,7 @@ def n_at_a_time(items: List[int], n: int, fillvalue: str) \
     it = iter(items)
     return itertools.zip_longest(*[it] * n, fillvalue=fillvalue)
 
+
 def binary2base64(binary_file: str) -> str:
     """Convert a binary file (OGG, executable, etc.) to a
     printable string.
@@ -97,12 +102,14 @@ def binary2base64(binary_file: str) -> str:
         encoded_string = base64.b64encode(bin_file.read())
     return encoded_string.decode()
 
+
 def base642binary(b64_fname: str) -> bytes:
     """Convert a printable string to a binary file.
     """
-    b64_fname += '==='
+    b64_fname += "==="
     return base64.b64decode(b64_fname)
 
+
 def open_image(fname_or_instance: Union[str, IO[bytes]]):
     """Opens a Image and returns it.