[英]Python v3 ( Random password generator )
My question is: how to generate a random password with a length that varies from (8 to 12 characters) each time generated.我的问题是:如何生成每次生成的长度从(8 到 12 个字符)不等的随机密码。
This is my code:这是我的代码:
import string
import random
def randompassword():
chars=string.ascii_uppercase + string.ascii_lowercase + string.digits
size=8
return ''.join(random.choice(chars) for x in range(size,12))
print(randompassword())
size = 8; range(size, 12)
size = 8; range(size, 12)
always returns array [8,9,10,11]
, so you always get a password of length 4. Instead, determine the size of this particular password using randint
ahead of time: size = 8; range(size, 12)
总是返回数组[8,9,10,11]
,所以你总是得到一个长度为 4 的密码。 相反,提前使用randint
确定这个特定密码的大小:
import string
import random
def randompassword():
chars = string.ascii_uppercase + string.ascii_lowercase + string.digits
size = random.randint(8, 12)
return ''.join(random.choice(chars) for x in range(size))
There are nuances to this question and certain solutions may cause password weakness
problems.这个问题有细微差别,某些解决方案可能会导致
password weakness
问题。 Consider the following nuances along with the solution alternative.考虑以下细微差别以及解决方案替代方案。
string.printable
, but this isn't a good idea since that contains whitespace characters.string.printable
,但这不是一个好主意,因为它包含空格字符。 While they are not strictly illegal for passwords, you cannot easily see them and therefore cannot differentiate, say, a tab from several spaces (and so on).random.choices()
is used (as in other answers), one should also employ it's weights=
and cum_weights=
options, to eliminate aforementioned biases and even-out the distribution.random.choices()
(如在其他答案中),还应使用它的weights=
和cum_weights=
选项,以消除上述偏差并使分布均匀。secrets
module rather that its random
module for this use case.secrets
模块而不是它的random
模块。 From their documentation on random :Warning: The pseudo-random generators of this module should not be used for security purposes.
警告:该模块的伪随机生成器不应用于安全目的。 For security or cryptographic uses, see the secrets module.
对于安全或加密用途,请参阅secrets模块。
Here is one functionally-oriented solution using Python-3 .这是一个使用Python-3的面向功能的解决方案。 It uses
secrets.choice()
only.它仅使用
secrets.choice()
。 It doesn't totally solve the random problem (other nuances remain), but it does improve selection-distribution to reduces bias:它并没有完全解决随机问题(其他细微差别仍然存在),但它确实改善了选择分布以减少偏差:
>>> import string, secrets
>>> char_classes = (string.ascii_lowercase,
string.ascii_uppercase,
string.digits,
string.punctuation)
>>> size = lambda: secrets.choice(range(8,13)) # Chooses a password length.
>>> char = lambda: secrets.choice(secrets.choice(char_classes)) # Chooses one character, uniformly selected from each of the included character classes.
>>> pw = lambda: ''.join([char() for _ in range(size())]) # Generates the variable-length password.
DEMO : Generate 10 variable-length password-strings using characters uniformly selected from each of our character classes:演示:使用从我们的每个字符类中统一选择的字符生成 10 个可变长度的密码字符串:
>>> for i in range(1,11):
>>> p = pw()
>>> print('%i) %i chars :: %s' % (i,len(p),p))
1) 11 chars :: IwWNEAUmnJt
2) 10 chars :: ;N/'tO6RTv
3) 8 chars :: l=5.2CDh
4) 10 chars :: V0=I+A`t2Q
5) 12 chars :: PQm8:f,#56"9
6) 10 chars :: KOdx9~%r;F
7) 11 chars :: <?67U8}3>F{
8) 11 chars :: G$5y~3fE7o*
9) 10 chars :: 70,|=Rexwn
10) 8 chars :: &31P^@cU
Finally, while we used the secrets
module here, something similar could be done using numpy
and numpy.random
.最后,虽然我们在这里使用了
secrets
模块,但可以使用numpy
和numpy.random
完成类似的事情。 I hope this helps!我希望这会有所帮助!
Edit: As stated below the string.printable
string contains characters that can cause issues when used for passwords.编辑:如下所述,
string.printable
字符串包含在用于密码时可能导致问题的字符。 Instead of relying on this build-in set you're probably better off defining a custom set of usable characters.与其依赖这个内置集,不如定义一组自定义的可用字符。 Don't forget about characters as space which are LHF to improving the strength of a password.
不要忘记字符作为空格,它们是提高密码强度的 LHF。 Just be sure to handle heading/tailing spaces as the UI could potentially strip the input of a user preventing them from entering a valid password.
请务必处理标题/尾随空格,因为 UI 可能会剥离用户的输入,从而阻止他们输入有效密码。
import random import string def randompassword(): return ''.join([random.choice(string.printable) for _ in range(random.randint(8, 12))])
I believe it's only printing 4 characters due to size = 8
and range(size,12)
.我相信由于
size = 8
和range(size,12)
它只打印 4 个字符。 This translates to range(8, 12) = 4 characters.这转化为 range(8, 12) = 4 个字符。 You could increase the second number to allocate for a larger range to print random characters for like so
您可以增加第二个数字以分配更大的范围来打印随机字符,就像这样
import string
import random
def randompassword():
chars=string.ascii_uppercase + string.ascii_lowercase + string.digits
size= 8
return ''.join(random.choice(chars) for x in range(size,20))
print(randompassword())
Also be sure to check out python's random documentation here .还请务必在此处查看 python 的随机文档。
string.ascii_letters #considers all the small case and large case alphabets.
string.ascii_letters #考虑所有小写字母和大写字母。 string.digits #considers 0 to 9 digits.
string.digits #考虑 0 到 9 位数字。 string.punctuation #considers the special characters like symbols.
string.punctuation #考虑特殊字符,如符号。 random.choice #considers to randomly pick from the given data.
random.choice #考虑从给定数据中随机选择。 range(random.randint(6, 12)) #considers to pick a random int range from the given data.
range(random.randint(6, 12)) #考虑从给定数据中选择一个随机整数范围。 print(generator_pw()) #prints random generated password.
print(generator_pw()) #打印随机生成的密码。
import random, string
def generator_pw():
pwd = string.ascii_letters + string.digits + string.punctuation
return "".join(random.choice(pwd) for x in range(random.randint(6, 12)))
print(generator_pw())
range(size,12)
only returns numbers between size
(which you've hardcoded to 8) and 12, so your passwords will only be 4 characters long. range(size,12)
仅返回size
(您已硬编码为 8)和 12 之间的数字,因此您的密码只有 4 个字符长。 Make that ... for x in range(size)
.使
... for x in range(size)
。
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