Python常用内置的字符串处理函数整理,python函数,收集常用的Python


收集常用的Python 内置的各种字符串处理 函数的使用方法str='python String function'生成字符串变量str='python String function'字符串长度获取:len(str)例:print '%s length=%d' % (str,len(str))字母处理全部大写:str.upper()全部小写:str.lower()大小写互换:str.swapcase()首字母大写,其余小写:str.capitalize()首字母大写:str.title()print '%s lower=%s' % (str,str.lower())print '%s upper=%s' % (str,str.upper())print '%s swapcase=%s' % (str,str.swapcase())print '%s capitalize=%s' % (str,str.capitalize())print '%s title=%s' % (str,str.title())格式化相关获取固定长度,右对齐,左边不够用空格补齐:str.ljust(width)获取固定长度,左对齐,右边不够用空格补齐:str.ljust(width)获取固定长度,中间对齐,两边不够用空格补齐:str.ljust(width)获取固定长度,右对齐,左边不足用0补齐print '%s ljust=%s' % (str,str.ljust(20))print '%s rjust=%s' % (str,str.rjust(20))print '%s center=%s' % (str,str.center(20))print '%s zfill=%s' % (str,str.zfill(20))字符串搜索相关搜索指定字符串,没有返回-1:str.find('t')指定起始位置搜索:str.find('t',start)指定起始及结束位置搜索:str.find('t',start,end)从右边开始查找:str.rfind('t')搜索到多少个指定字符串:str.count('t')上面所有方法都可用index代替,不同的是使用index查找不到会抛异常,而find返回-1print '%s find nono=%d' % (str,str.find('nono'))print '%s find t=%d' % (str,str.find('t'))print '%s find t from %d=%d' % (str,1,str.find('t',1))print '%s find t from %d to %d=%d' % (str,1,2,str.find('t',1,2))#print '%s index nono ' % (str,str.index('nono',1,2))print '%s rfind t=%d' % (str,str.rfind('t'))print '%s count t=%d' % (str,str.count('t'))字符串替换相关替换old为new:str.replace('old','new')替换指定次数的old为new:str.replace('old','new',maxReplaceTimes)print '%s replace t to *=%s' % (str,str.replace('t', '*'))print '%s replace t to *=%s' % (str,str.replace('t', '*',1))字符串去空格及去指定字符去两边空格:str.strip()去左空格:str.lstrip()去右空格:str.rstrip()去两边字符串:str.strip('d'),相应的也有lstrip,rstripstr=' python String function 'print '%s strip=%s' % (str,str.strip())str='python String function'print '%s strip=%s' % (str,str.strip('d'))按指定字符分割字符串为数组:str.split(' ')默认按空格分隔str='a b c de'print '%s strip=%s' % (str,str.split())str='a-b-c-de'print '%s strip=%s' % (str,str.split('-'))字符串判断相关是否以start开头:str.startswith('start')是否以end结尾:str.endswith('end')是否全为字母或数字:str.isalnum()是否全字母:str.isalpha()是否全数字:str.isdigit()是否全小写:str.islower()是否全大写:str.isupper()str='python String function'print '%s startwith t=%s' % (str,str.startswith('t'))print '%s endwith d=%s' % (str,str.endswith('d'))print '%s isalnum=%s' % (str,str.isalnum())str='pythonStringfunction'print '%s isalnum=%s' % (str,str.isalnum())print '%s isalpha=%s' % (str,str.isalpha())print '%s isupper=%s' % (str,str.isupper())print '%s islower=%s' % (str,str.islower())print '%s isdigit=%s' % (str,str.isdigit())str='3423'print '%s isdigit=%s' % (str,str.isdigit())

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