[Python基础]007.字符串

字符串

内建操作

内建操作

字符串长度

len

代码

s = 'abcd'

print len(s)

大小写变换

lower 小写
upper 大写
swapcase 大小写互换
capiatlize 首字母大写

代码

s = 'aBcd'

print s.lower()

print s.upper()

print s.swapcase()

print s.capitalize()

去空格或其他

strip 截掉左右空格或左右其他字符
lstrip 截掉左空格或左右其他字符
rstrip 截掉右空格或左右其他字符

代码

# 去空格回车

s = ' abcd \n'

print s.strip()         # abcd

print s.lstrip()        # abcd \n

print s.rstrip()        #  abcd

# 去特定字符

s = 'abcda'

print s.strip('a')      # bcd

print s.lstrip('a')     # bcda

print s.rstrip('a')     # abcd

连接字符串

+ 直接加运算
join 连接多个字符串

代码

# 直接连接

s = 'abc'

print s + 'defg'

# 连接多个字符串

strs = ['a', 'b', 'c', 'd']     # 要连接的字符串数组

sep = ','                       # 字符串之间的分隔符

s = sep.join(strs)              # 连接

print s                         # 输出 a,b,c,d

查找替换

find 返回出现的第一个标号，没有找到则返回-1。
index 与find一样，但在没有找到时会抛出异常。
rfind 返回最后出现的第一个标号，没有找到则返回-1。
rindex 与rfind相同，但在没找到时会抛出异常。
count 统计字符串出现次数。
replace 替换字符串

代码

# 查找

s = 'abcdefgabcdefg'

print s.find('e')           #

print s.index('e')          #

print s.rfind('e')          #

print s.rindex('e')         #

print s.count('e')          #

# 特定范围查找

print s.find('e', 5, 7)     # -1 查找范围s[5:7]

print s.index('e', 5)       # 11 查找范围s[5:]

print s.rfind('e', 5, 7)    # -1 查找范围s[5:7]

print s.rindex('e', 0, 5)   # 4  查找范围s[0:5]

# 替换字符串

print s.replace('a', 'z')       # 'zbcdefgzbcdefg'

# 限定替换次数

print s.replace('a', 'z', 1)    # 'zbcdefgabcdefg' 1为替换次数

分割

split 分割

代码

# 全部分割

s = 'a, b, c, d, e'

print s.split(',')              # ['a', 'b', 'c', 'd', 'e']

# 分割前n个

print s.split(',', 2)           # ['a', 'b', 'c,d,e'] 分割前2个 2为次数

判断

isalnum 判断是否只包含字母或数字
isalpha 判断是否只包含字母
isdigit 判断是否只包含数字
isdecimal 判断是否只包含十进制数
isnumeric 判断是否只包含数字字符
isspace 判断是否只包含空格
istitle 判断是否是标题化的
isupper 判断是否都是大写
islower 判断是否都是小写

代码

s = 'abc'

print s.isalpha()

# ...

本站文章为宝宝巴士 SD.Team原创，转载务必在明显处注明：（作者官方网站：宝宝巴士)
转载自【宝宝巴士SuperDo团队】 原文链接: http://www.cnblogs.com/superdo/p/4579225.html

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