u'string'和unicode（字符串）之间的区别

Question

This is a sample program i made:

>>> print u'\u1212'
ሒ
>>> print '\u1212'
\u1212
>>> print unicode('\u1212')
\u1212

why do i get \ሒ instead of ሒ when i print unicode('\ሒ') ?

I'm making a program to store data and not print it, so how do i store ሒ instead of \ሒ ? Now obviously i can't do something like:

x = u''+unicode('\u1212')

interestingly even if i do that, here's what i get:

\u1212

another fact that i think is worth mentioning :

>>> u'\u1212' == unicode('\u1212')
False

What do i do to store ሒ or some other character like that instead of \\uxxxx ?

Answer 1

'\ሒ' is an ASCII string with 6 characters: \\ , u , 1 , 2 , 1 , and 2 .

unicode('\ሒ') is a Unicode string with 6 characters: \\ , u , 1 , 2 , 1 , and 2

u'\ሒ' is a Unicode string with one character: ሒ .

You should use Unicode strings all around, if that's what you want.

u'\u1212'

If for some reason you need to convert '\ሒ' to u'\ሒ' , use

'\u1212'.decode('unicode-escape')

(Note that in Python 3, strings are always Unicode.)

Answer 2

This is just a misunderstanding.

This is a unicode string: x = u'\ሒ'

When you call print x it is will print its character ( ሒ ) as shown. If you just call x it will show the repr esntation of it:

u'\u1212'

All is well with the world.

This is an ascii string: y = "\ሒ"

When you call print y it is will print its value ( \ሒ ) as shown. If you just call x it will show the repr esntation of it:

'\\udfgdfg'

Notice the double slashes ( \\\\ ) that indicate the slash is being escaped.

So, lets look at the following function call: print unicode('\ሒ')

This is a function call, and we can replace the string with a variable, so we'll use the equivilent:

y = "\u1212"
print unicode(x)

But as in the second exacmple above, y is an ascii string that is being managed internally as '\\udfgdfg', its not a unicode string at all. So the unicode representation of '\\\\udfgdfg' is exactly the same. Thus why its not behaving correctly.