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-1
print \’%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,rstrip
str=\’ 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())