Python语言总结 4.2. 和字符串(str,unicode等)处理有关的函数

4.2.7. 去除控制字符:removeCtlChr

Python语言总结
4.2. 和字符串(str,unicode等)处理有关的函数
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4.2.7. 去除控制字符:removeCtlChr

使得处理后的字符串，在XML都是合法的了。

#------------------------------------------------------------------------------
# remove control character from input string
# otherwise will cause wordpress importer import failed
# for wordpress importer, if contains contrl char, will fail to import wxr
# eg:
# 1. http://againinput4.blog.163.com/blog/static/172799491201110111145259/
# content contains some invalid ascii control chars
# 2. http://hi.baidu.com/notebookrelated/blog/item/8bd88e351d449789a71e12c2.html
# 165th comment contains invalid control char: ETX
# 3. http://green-waste.blog.163.com/blog/static/32677678200879111913911/
# title contains control char:DC1, BS, DLE, DLE, DLE, DC1
def removeCtlChr(inputString) :
    validContent = '';
    for c in inputString :
        asciiVal = ord(c);
        validChrList = [
            9, # 9=\t=tab
            10, # 10=\n=LF=Line Feed=换行
            13, # 13=\r=CR=回车
        ];
        # filter out others ASCII control character, and DEL=delete
        isValidChr = True;
        if (asciiVal == 0x7F) :
            isValidChr = False;
        elif ((asciiVal < 32) and (asciiVal not in validChrList)) :
            isValidChr = False;
       
        if(isValidChr) :
            validContent += c;

return validContent;

Example 4.11. removeCtlChr的使用范例

# remove the control char in title:
# eg;
# http://green-waste.blog.163.com/blog/static/32677678200879111913911/
# title contains control char:DC1, BS, DLE, DLE, DLE, DC1
infoDict['title'] = removeCtlChr(infoDict['title']);

[Tip]     关于控制字符

如果不了解什么是控制字符，请参考：ASCII字符集中的功能/控制字符
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4.2.6. 去除非单词（non-word）的字符:removeNonWordChar      Home      4.2.8. 将字符实体替换为Unicode数字实体:replaceStrEntToNumEnt

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