Make smart futures avoid polling.

[python_utils.git] / string_utils.py

diff --git a/string_utils.py b/string_utils.py
index a6a2da3155fcf312e9a9bc21ecd94f26141b4fcb..9a38d25c49cccddceec4da06ee8bbfe8133749aa 100644 (file)
--- a/string_utils.py
+++ b/string_utils.py
@@ -791,6 +791,9 @@ def extract_mac_address(in_str: Any, *, separator: str = ":") -> Optional[str]:
     >>> extract_mac_address(' MAC Address: 34:29:8F:12:0D:2F')
     '34:29:8F:12:0D:2F'
 
+    >>> extract_mac_address('? (10.0.0.30) at d8:5d:e2:34:54:86 on em0 expires in 1176 seconds [ethernet]')
+    'd8:5d:e2:34:54:86'
+
     """
     if not is_full_string(in_str):
         return None
@@ -1500,6 +1503,19 @@ def from_bitstring(bits: str, encoding='utf-8', errors='surrogatepass') -> str:
     return n.to_bytes((n.bit_length() + 7) // 8, 'big').decode(encoding, errors) or '\0'
 
 
+def ip_v4_sort_key(txt: str) -> str:
+    """Turn an IPv4 address into a tuple for sorting purposes.
+
+    >>> ip_v4_sort_key('10.0.0.18')
+    (10, 0, 0, 18)
+
+    """
+    if not is_ip_v4(txt):
+        print(f"not IP: {txt}")
+        return None
+    return tuple([int(x) for x in txt.split('.')])
+
+
 if __name__ == '__main__':
     import doctest
     doctest.testmod()