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#!/usr/bin/env python3
from __future__ import unicode_literals, absolute_import
from typing import Optional, Union
import ipaddress
import string
def strip_non_printable(value: Optional[str]) -> Optional[str]:
"""
Removes any non-printable characters and adds an indicator to the string
when binary characters are fonud.
:param value: the value that you wish to strip
"""
if value is None:
return None
# Filter all non-printable characters
# (note that we must use join to account for the fact that Python 3
# returns a generator)
printable_value = "".join(filter(lambda c: c in string.printable, value))
if printable_value != value:
if printable_value:
printable_value += " "
printable_value += "(contains binary)"
return printable_value
def tostr(value: Union[str, int, float, None]) -> Optional[str]:
"""
Converts any variable to a string or returns None if the variable
contained None to begin with; this function currently supports None,
unicode strings, byte strings and numbers.
:param value: the value you wish to convert to a string
"""
if value is None:
return None
elif isinstance(value, str):
return value
elif isinstance(value, (int, float)):
return str(value)
else:
return value
def is_hostname_ipv6(hostname: str) -> bool:
try:
ipaddress.IPv6Address(hostname)
except ipaddress.AddressValueError:
return False
else:
return True
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