/usr/lib/python3/dist-packages/rstr/rstr_base.py is in python3-rstr 2.2.6-1.
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import itertools
import random
import string
from copy import copy
from functools import partial
from rstr.xeger import Xeger
ALPHABETS = {'printable': string.printable,
'letters': string.ascii_letters,
'uppercase': string.ascii_uppercase,
'lowercase': string.ascii_lowercase,
'digits': string.digits,
'punctuation': string.punctuation,
'nondigits': string.ascii_letters + string.punctuation,
'nonletters': string.digits + string.punctuation,
'whitespace': string.whitespace,
'nonwhitespace': string.printable.strip(),
'normal': string.ascii_letters + string.digits + ' ',
'word': string.ascii_letters + string.digits + '_',
'nonword': ''.join(set(string.printable)
.difference(string.ascii_letters +
string.digits + '_')),
'postalsafe': string.ascii_letters + string.digits + ' .-#/',
'urlsafe': string.ascii_letters + string.digits + '-._~',
'domainsafe': string.ascii_letters + string.digits + '-'
}
class RstrBase(object):
"""Create random strings from a variety of alphabets.
The alphabets for printable(), uppercase(), lowercase(), digits(), and
punctuation() are equivalent to the constants by those same names in the
standard library string module.
nondigits() uses an alphabet of string.letters + string.punctuation
nonletters() uses an alphabet of string.digits + string.punctuation
nonwhitespace() uses an alphabet of string.printable.strip()
normal() uses an alphabet of string.letters + string.digits + ' ' (the
space character)
postalsafe() is based on USPS Publication 28 - Postal Addressing Standards:
http://pe.usps.com/text/pub28/pub28c2.html
The characters allowed in postal addresses are letters and digits, periods,
slashes, the pound sign, and the hyphen.
urlsafe() uses an alphabet of unreserved characters safe for use in URLs.
From section 2.3 of RFC 3986: "Characters that are allowed in a URI but
do not have a reserved purpose are called unreserved. These include
uppercase and lowercase letters, decimal digits, hyphen, period,
underscore, and tilde.
domainsafe() uses an alphabet of characters allowed in hostnames, and
consequently, in internet domains: letters, digits, and the hyphen.
"""
def __init__(self, _random, **custom_alphabets):
super(RstrBase, self).__init__()
self._random = _random
self._alphabets = copy(ALPHABETS)
for alpha_name, alphabet in custom_alphabets.items():
self.add_alphabet(alpha_name, alphabet)
def add_alphabet(self, alpha_name, characters):
"""Add an additional alphabet to an Rstr instance and make it available
via method calls.
"""
self._alphabets[alpha_name] = characters
def __getattr__(self, attr):
if attr in self._alphabets:
return partial(self.rstr, self._alphabets[attr])
else:
message = "Rstr instance has no attribute: {0}".format(attr)
raise AttributeError(message)
def sample_wr(self, population, k):
"""Samples k random elements (with replacement) from a population"""
return [self._random.choice(population)
for i in itertools.repeat(None, k)]
def rstr(self, alphabet, start_range=None,
end_range=None, include='', exclude=''):
"""Generate a random string containing elements from 'alphabet'
By default, rstr() will return a string between 1 and 10 characters.
You can specify a second argument to get an exact length of string.
If you want a string in a range of lengths, specify the start and end
of that range as the second and third arguments.
If you want to make certain that particular characters appear in the
generated string, specify them as "include".
If you want to *prevent* certain characters from appearing, pass them
as 'exclude'.
"""
popul = [char for char in list(alphabet) if char not in list(exclude)]
if end_range is None:
if start_range is None:
start_range, end_range = (1, 10)
else:
k = start_range
if end_range:
k = self._random.randint(start_range, end_range)
result = self.sample_wr(popul, k) + list(include)
self._random.shuffle(result)
return ''.join(result)
class Rstr(RstrBase, Xeger):
def __init__(self, _random=random, **alphabets):
super(Rstr, self).__init__(_random=_random, **alphabets)
default_instance = Rstr()
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