本文实例讲述了Python实现针对含中文字符串的截取功能。分享给大家供大家参考,具体如下:
对于含多字节的字符串,进行截断的时候,要判断截断处是几字节字符,不能将多字节从中分割,避免截断后乱码
下面给出utf8和gb18030上的实现, 用任何一种都可以,可以先进行转码,用encode, decode;
方法1:对utf8:
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def subString(string,length):
if length > = len (string):
return string
result = ''
i = 0
p = 0
while True :
ch = ord (string[i])
#1111110x
if ch > = 252 :
p = p + 6
#111110xx
elif ch > = 248 :
p = p + 5
#11110xxx
elif ch > = 240 :
p = p + 4
#1110xxxx
elif ch > = 224 :
p = p + 3
#110xxxxx
elif ch > = 192 :
p = p + 2
else :
p = p + 1
if p > = length:
break ;
else :
i = p
return string[ 0 :i]
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方法2:对gb18030编码
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def cut_string_off(string,s_len):
if len (string) = = 0 or s_len < = 0 :
return string
elif len (string) = = 1 or s_len > = len (string):
return string
elif s_len < len (string):
len_num = 0
while len_num < s_len:
tmp_c = ord (string[len_num])
if tmp_c > 0 and tmp_c < = 0x7F :
len_num + = 1
continue
tmp_nextc = ord (string[len_num + 1 ])
if tmp_c > = 0x81 and tmp_c < = 0xFE and tmp_nextc> = 0x40 and tmp_nextc< = 0xFE :
len_num + = 2
continue
else :
len_num + = 1 ;
continue
break
tmp = string[ 0 :len_num]
# print utf2gbk(tmp)
return tmp
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希望本文所述对大家Python程序设计有所帮助。
原文链接:http://www.cnblogs.com/liyuxia713/p/3518689.html