python数据类型之字符串

Posted 2020-12-27 fengpiaoluoye

续接上文

1.isdecimal,isgigit,isnumeric:当前输入是否为数字

1 test = "12"

1 v1 = test.isdecimal()
2 v2 = test.isdigit()
3 v3 = test.isnumeric()
4 print(v1, v2)

结果：

True True

2.isidentifier:判断是否为标识符

1 import keyword
2 print(keyword.iskeyword("def"))
3 test = "def"
4 v = test.isidentifier()
5 print(v)

 结果：

True
True

 

3.isprintable:是否存在不可显示的字符

1 # 	  制表符
2 # 
  换行符
3 test = "ddfer	huyb"
4 v = test.isprintable()
5 print(v)

 

结果：

False

 

4.isspace:判断是否全部是空格

1 test = " "
2 v = test.isspace()
3 print(v)

 

结果：

True

 

5.istitle:判断是否为标题

1 test = "Adsjdjksdskd jdfksdslkdj"
2 v1 = test.istitle()
3 print(v1)
4 v = test.title()
5 print(v)
6 v2 = test.istitle()
7 print(v2)

 

结果：

False
Adsjdjksdskd Jdfksdslkdj
False

 

6.join:将字符串中的每一个元素按照指定分隔符进行拼接

1 test = "你是风儿我是沙"
2 print(test)
3 t = ‘ ‘
4 v = t.join(test)
5 v1 = ‘_‘.join(test)
6 print(v)
7 print(v1)

 

结果：

你是风儿我是沙
你 是 风 儿 我 是 沙
你_是_风_儿_我_是_沙

 

7.ljust,rjust,zfill:对字符串指定大小填充字符

1 test = "feng"
2 v = test.ljust(20,"*")
3 v1 = test.rjust(20,"*")
4 v2 = test.zfill(20)
5 print(v)
6 print(v1)
7 print(v2)

 

结果:

feng****************
****************feng
0000000000000000feng

 

8.islower,lower,isupper,upper:判断是否全部大小写和转换为大小写

1 test = "Feng"
2 v1 = test.islower()
3 v2 = test.lower()
4 print(v1,v2)
5 v3 = test.isupper()
6 v4 = test.upper()
7 print(v3,v4)

 

结果：

False feng
False FENG

 

9.lstrip,rstrip,strip:去除左右空白， ，

1 test = " 
feng "
2 v = test.lstrip()
3 v1 = test.rstrip()
4 v2 = test.strip()
5 print(v,v1,v2)

 

结果:

feng   
feng feng

 

10.translate:将对应的字符进行转换

1 v = "saevdds;gfuiuyv;sdiujsd"
2 m = str.maketrans("aeiou", "12345")
3 new_v = v.translate(m)
4 print(new_v)

 

结果:

s12vdds;gf535yv;sd35jsd

 

11.partition,rpartition,split,rsplit:按照指定字符进行分割

1 test = "testuufuskjksdkd"
2 v = test.partition(‘s‘) # 最多分割成三分
3 v1 = test.rpartition(‘s‘)
4 v2 = test.split(‘s‘,2)
5 v3 = test.rsplit(‘s‘,3)
6 print(v, v1, v2, v3)

 

结果：

(‘te‘, ‘s‘, ‘tuufuskjksdkd‘) (‘testuufuskjk‘, ‘s‘, ‘dkd‘) [‘te‘, ‘tuufu‘, ‘kjksdkd‘] [‘te‘, ‘tuufu‘, ‘kjk‘, ‘dkd‘]

 

12.splitlines:分割，只能根据，True,False:是否保留换行

1 test1 = "wdsdsfd
sdfdfg
cadewefq
sd"
2 v4 = test1.splitlines(True)
3 print(v4)

 

结果：

[‘wdsdsfd
‘, ‘sdfdfg
‘, ‘cadewefq
‘, ‘sd‘]

 

13.startswith,endswith:以xxx开头，以xx结尾

1 test = "backend 1.1.1.1"
2 v = test.startswith("a")
3 print(v)
4 v1 = test.endswith(‘a‘)
5 print(v1)

 

结果：

False
False

 

14.swapcase:大小写转换

1 test = "feng"
2 v = test.swapcase()
3 print(v)

 

结果：

FENG

 

 

好了，这就是差不多所有常用的字符串常用功能