python数据类型之字符串（二）

续接上文

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

test = "12"

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

结果：

True True

2.isidentifier:判断是否为标识符

import keyword
print(keyword.iskeyword("def"))
test = "def"
v = test.isidentifier()
print(v)

 结果：

True
True

3.isprintable:是否存在不可显示的字符

# 	  制表符
# 
  换行符
test = "ddfer	huyb"
v = test.isprintable()
print(v)

结果：

False

4.isspace:判断是否全部是空格

test = " "
v = test.isspace()
print(v)

结果：

True

5.istitle:判断是否为标题

test = "Adsjdjksdskd jdfksdslkdj"
v1 = test.istitle()
print(v1)
v = test.title()
print(v)
v2 = test.istitle()
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

test = "你是风儿我是沙"
print(test)
t = ' '
v = t.join(test)
v1 = '_'.join(test)
print(v)
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

test = "feng"
v = test.ljust(20,"*")
v1 = test.rjust(20,"*")
v2 = test.zfill(20)
print(v)
print(v1)
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

test = "Feng"
v1 = test.islower()
v2 = test.lower()
print(v1,v2)
v3 = test.isupper()
v4 = test.upper()
print(v3,v4)

结果：

False feng
False FENG

9.lstrip,rstrip,strip:去除左右空白， ，

test = " 
feng "
v = test.lstrip()
v1 = test.rstrip()
v2 = test.strip()
print(v,v1,v2)

结果:

feng   
feng feng

10.translate:将对应的字符进行转换

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

结果:

s12vdds;gf535yv;sd35jsd

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

test = "testuufuskjksdkd"
v = test.partition('s') # 最多分割成三分
v1 = test.rpartition('s')
v2 = test.split('s',2)
v3 = test.rsplit('s',3)
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

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

结果：

['wdsdsfd
', 'sdfdfg
', 'cadewefq
', 'sd']

13.startswith,endswith:以xxx开头，以xx结尾

test = "backend 1.1.1.1"
v = test.startswith("a")
print(v)
v1 = test.endswith('a')
print(v1)

结果：

False
False

14.swapcase:大小写转换

test = "feng"
v = test.swapcase()
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