[英]Generate random element from list with no more than one repetition of one element
I am trying to generate a pattern whose vocabulary can consist of only 'A', 'B', 'C', 'D' or '*'
, characters can repeat any number of times but the catch is that resulting the pattern must have at least one letter. 我正在尝试生成一个其词汇表只能由
'A', 'B', 'C', 'D' or '*'
,字符可以重复任意次数,但要注意的是,导致该模式必须具有至少一个字母。
I tried with random module and this is the closest I came to what I want: 我尝试使用随机模块,这是我最想要的:
random.sample(set(vocabulary), 5)
Out[30]: ['A', 'D', '*', 'B', 'C']
Ideally I would like to see output like: 理想情况下,我希望看到如下输出:
A***
ABAB
ABC*
and so on 等等
how can I go about this? 我该怎么办?
Actually you want the product of your list element, you can use itertools.product
: 实际上,您需要list元素的乘积,可以使用
itertools.product
:
>>> from itertools import product
>>> voc=['A', 'B', 'C', 'D', '*']
>>> for pro in product(voc,repeat=5):
... print ''.join(pro)
*AAAA
*AAAB
*AAAC
*AAAD
*AAA*
*AABA
*AABB
*AABC
.
.
And if you just want to get ride of equal subsets you can use the following list comprehension, for example: 而且,如果您只是想获得相等的子集,则可以使用以下列表理解,例如:
>>> voc=['C', 'D', '*']
>>> list(product(voc,repeat=3))
[('C', 'C', 'C'), ('C', 'C', 'D'), ('C', 'C', '*'), ('C', 'D', 'C'), ('C', 'D', 'D'), ('C', 'D', '*'), ('C', '*', 'C'), ('C', '*', 'D'), ('C', '*', '*'), ('D', 'C', 'C'), ('D', 'C', 'D'), ('D', 'C', '*'), ('D', 'D', 'C'), ('D', 'D', 'D'), ('D', 'D', '*'), ('D', '*', 'C'), ('D', '*', 'D'), ('D', '*', '*'), ('*', 'C', 'C'), ('*', 'C', 'D'), ('*', 'C', '*'), ('*', 'D', 'C'), ('*', 'D', 'D'), ('*', 'D', '*'), ('*', '*', 'C'), ('*', '*', 'D'), ('*', '*', '*')]
>>> list(i for i in product(voc,repeat=3)if len(set(i))>1)
[('C', 'C', 'D'), ('C', 'C', '*'), ('C', 'D', 'C'), ('C', 'D', 'D'), ('C', 'D', '*'), ('C', '*', 'C'), ('C', '*', 'D'), ('C', '*', '*'), ('D', 'C', 'C'), ('D', 'C', 'D'), ('D', 'C', '*'), ('D', 'D', 'C'), ('D', 'D', '*'), ('D', '*', 'C'), ('D', '*', 'D'), ('D', '*', '*'), ('*', 'C', 'C'), ('*', 'C', 'D'), ('*', 'C', '*'), ('*', 'D', 'C'), ('*', 'D', 'D'), ('*', 'D', '*'), ('*', '*', 'C'), ('*', '*', 'D')]
chars=['A', 'B', 'C', 'D', '*']
s=""
L = len(chars)
for i in range(0,5):
s += chars[random.randrange(0,L)]
# now ensure that a character is present by setting a random character
s[random.randrange(0,5)] = chars[random.randrange(0,L-1)]
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