[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

conversions/octal_to_binary.py

@@ -59,30 +59,16 @@ def octal_to_binary(octal: str) -> str:
     oct_string = str(octal).strip()
     if not oct_string:
         raise ValueError("Empty string was passed to the function")
-    is_negative = oct_string[0] == "-"
+    is_negative = oct_string.startswith("-")
     if is_negative:
         oct_string = oct_string[1:]
+        binary_num = "-0b"
+    else:
+        binary_num = "0b"
     if not oct_string.isdigit() or not all(0 <= int(char) <= 7 for char in oct_string):
         raise ValueError("Non-octal value was passed to the function")
-    decimal_number = 0
-    for char in oct_string:
-        decimal_number = 8 * decimal_number + int(char)
-    if is_negative:
-        decimal_number = -decimal_number
-    # Converting Decimal to Binary
-    if decimal_number == 0:
-        return "0b0"
-    negative = False
-    if decimal_number < 0:
-        negative = True
-        decimal_number = -decimal_number
-    binary: list[int] = []
-    while decimal_number > 0:
-        binary.insert(0, decimal_number % 2)
-        decimal_number >>= 1
-    if negative:
-        return "-0b" + "".join(str(e) for e in binary)
-    return "0b" + "".join(str(e) for e in binary)
+    binary_num += str(bin(int(oct_string, 8)))[2:]
+    return binary_num
 
 
 if __name__ == "__main__":