[英]How do I unstring in python
因此,我正在尝试制作一个文本加密程序,该程序会将文本中的字母更改为不同的顺序字母,但是a = key [1](键是重新排列的字母的名称),但是由于key [1 ]不能分配给乱扔垃圾,有关如何解决此问题的任何想法。
So key
is your rearranged alphabet, and ALPHA
is the normal alphabet. 因此, key
是您重新排列的字母,而ALPHA
是普通字母。
ALPHA = 'abcdefghijklmnopqrstuvwxyz'
key = 'zwlsqpugxackmirnhfdvbjoeyt'
msg = 'secretmessage'
code = []
for i in msg:
code.append(key[ALPHA.index(i)])
print(''.join(code))
Make the string after encoding, rather than during encoding. 在编码之后而不是在编码期间制作字符串。
Strings in Python, and many other languages, are immutable, because reasons . 由于原因 ,Python和许多其他语言中的字符串是不可变的。
What you need is to create a new string, replacing characters as needed. 您需要创建一个新的字符串,并根据需要替换字符。
For byte strings (that in Python are plain byte arrays) there's .translate
. 对于字节字符串(在Python中是纯字节数组),存在.translate
。 It takes a 256-byte string that describes how to replace each possible byte. 它需要一个256字节的字符串来描述如何替换每个可能的字节。
For Unicode strings .translate
takes a map which is a bit more convenient but still maybe cumbersome: 对于Unicode字符串, .translate
一个映射,该映射稍微方便一些,但仍然很麻烦:
unicode('foo bar').translate({ord('f'): u'F', ord('b'): u'B'})
In general case, something like this should work: 在一般情况下,类似这样的方法应该起作用:
def transform_char(char):
# shift a characte 3 positions forward
return chr(ord(char) + 3)
def transform(source_string):
return ''.join(transform_char(c) for c in source_string)
What happens in transform
? transform
会发生什么? It generates a list of transformed characters ( [transform_char(c) for c in source_string]
) is called a "list comprehension". 它生成一个转换后的字符列表( [transform_char(c) for c in source_string]
)称为“列表理解”。 This list contains a transformed character for each character in source_string
. 此列表包含source_string
每个字符的转换字符。 Then all elements of this list are efficiently join
ed together by placing an empty string ''
between them. 然后,通过在列表中的所有元素之间放置一个空字符串''
,可以将它们有效地join
在一起。
I hope it's enough for you now. 我希望现在对您已经足够。
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