if not is_ip_v4(txt):
print(f"not IP: {txt}")
return None
- return tuple([int(x) for x in txt.split('.')])
+ return tuple(int(x) for x in txt.split('.'))
def path_ancestors_before_descendants_sort_key(volume: str) -> Tuple[str, ...]:
['/usr', '/usr/local', '/usr/local/bin']
"""
- return tuple([x for x in volume.split('/') if len(x) > 0])
+ return tuple(x for x in volume.split('/') if len(x) > 0)
def replace_all(in_str: str, replace_set: str, replacement: str) -> str:
return in_str
+def replace_nth(string: str, source: str, target: str, nth: int):
+ """Replaces the nth occurrance of a substring within a string.
+
+ >>> replace_nth('this is a test', ' ', '-', 3)
+ 'this is a-test'
+
+ """
+ where = [m.start() for m in re.finditer(source, string)][nth - 1]
+ before = string[:where]
+ after = string[where:]
+ after = after.replace(source, target, 1)
+ return before + after
+
+
if __name__ == '__main__':
import doctest