如何确保python中的所有字符串文字都是unicode

时间:2013-03-16 14:06:25

标签: python unicode unicode-literals

我有一个相当大的python代码库来完成。这是一个问题,其中一些字符串文字是字符串,其他字符串是unicode。这会导致错误。我试图将所有内容转换为unicode。我想知道是否有一个工具可以将所有文字转换为unicode。即如果它找到这样的东西:

print "result code %d" % result['code']

为:

print u"result code %d" % result[u'code']

如果它有助于我使用PyCharm(如果有一个扩展来执行此操作),但是我也很乐意使用类似的命令。希望这样的工具存在。

2 个答案:

答案 0 :(得分:8)

您可以使用tokenize.generate_tokens将Python代码的字符串表示形式分解为标记。 tokenize也会为您分类令牌。因此,您可以在Python代码中识别字符串文字。

然后操纵令牌并不难,在需要的位置添加'u'


import tokenize
import token
import io
import collections

class Token(collections.namedtuple('Token', 'num val start end line')):
    @property
    def name(self):
        return token.tok_name[self.num]

def change_str_to_unicode(text):    
    result = text.splitlines()
    # Insert a dummy line into result so indexing result
    # matches tokenize's 1-based indexing
    result.insert(0, '')
    changes = []
    for tok in tokenize.generate_tokens(io.BytesIO(text).readline):
        tok = Token(*tok)
        if tok.name == 'STRING' and not tok.val.startswith('u'):
            changes.append(tok.start)

    for linenum, s in reversed(changes):
        line = result[linenum]
        result[linenum] = line[:s] + 'u' + line[s:]
    return '\n'.join(result[1:])

text = '''print "result code %d" % result['code']
# doesn't touch 'strings' in comments
'handles multilines' + \
'okay'
u'Unicode is not touched'
'''

print(change_str_to_unicode(text))

产量

print u"result code %d" % result[u'code']
# doesn't touch 'strings' in comments
u'handles multilines' + u'okay'
u'Unicode is not touched'

答案 1 :(得分:1)

试试这个(使用正则表达式),它比@ unutbu的解决方案更短。
但是有一个循环漏洞,包含#的字符串将不适用于此。

import re
scode = '''
print "'Hello World'" # prints 'Hello World'
u'Unicode is unchanged'"""
# so are "comments"'''
x1 = re.compile('''(?P<unicode>u?)(?P<c>'|")(?P<data>.*?)(?P=c)''')

def repl(m):
    return "u%(c)s%(data)s%(c)s" % m.groupdict()

fcode = '\n'.join(
      [re.sub(x1,repl,i)
       if not '#' in i
       else re.sub(x1,repl,i[:i.find('#')])+i[i.find('#'):]
       for i in scode.splitlines()])
print fcode

输出:

print u"'Hello World'" # prints 'Hello World'
u'Unicode is unchanged'
# so are "comments"

对于#我有这个(它比@ unutbu的解决方案更长:|)

import re
scode = '''print "'Hello World'"  # prints 'Hello World'
u'Unicode is unchanged'
# so are "comments"
'#### Hi' # 'Hi' '''

x1 = re.compile('''(?P<unicode>u?)(?P<c>'|")(?P<data>.*?)(?P=c)''')

def in_string(text,index):
    curr,in_l,in_str,level = '',0,False,[]

    for c in text[:index+1]:
        if c == '"' or c == "'":
            if in_str and curr == c:
                instr = False
                curr = ''
                in_l -= 1
            else:
                instr = True
                curr = c
                in_l += 1
        level.append(in_l)
    return bool(level[index])

def repl(m):
    return "u%(c)s%(data)s%(c)s" % m.groupdict()

def handle_hashes(i):
    if i.count('#') == 1:
        n = i.find('#')
    else:
        n = get_hash_out_of_string(i)
    return re.sub(x1,repl,i[:n]) + i[n:]

def get_hash_out_of_string(i):
    n = i.find('#')
    curr = i[:]
    last = (len(i)-1)-''.join(list(reversed(i))).find('#')
    while in_string(curr,n) and n < last:
        curr = curr[:n]+' '+curr[n+1:]
        n = curr.find('#')
    return n

fcode = '\n'.join(
    [re.sub(x1,repl,i)
     if not '#' in i
     else handle_hashes(i)
     for i in scode.splitlines()])

print fcode

输出:

print u"'Hello World'"  # prints 'Hello World'
u'Unicode is unchanged'
# so are "comments"
u'#### Hi' # 'Hi'