[Python知识库]python字符串常用操作方法（三）

1、join 连接

s1 = 'dabai'
# 单引号里面得冒号是连接符，想以什么连接，引号里面就写什么
s2 = ':'.join(s1)
print(s2)

输出结果如下：

l1 = ['大白', '最帅', '最萌']
print(l1, type(l1))
# 将l1用（空字符）连接
l2 = ''.join(l1)
print(l2, type(l2))
l3 = '-'.join(l1)
print(l3)

2、isalnum(字符串由字母或数字组成) isalpha(字符串只由字母组成) isdecimal(字符串只由十进制组成)

isalnum

s1 = 'dabai123'
s2 = '123456'
s3 = '100①'
s4 = 'dabai*#'
s5 = 'dabai'
index = [s1, s2, s3, s4, s5]
# 字符串由字母或数字组成,s4结果应该为False
for i in (index):
    print(i.isalnum())

输出结果如下：

isalpha

s1 = 'dabai123'
s2 = '123456'
s3 = '100①'
s4 = 'dabai*#'
s5 = 'dabai'
index = [s1, s2, s3, s4, s5]
# 字符串只由字母组成，s5结果应该为True
for i in (index):
    print(i.isalpha())

输出结果如下：

isdecimal

s1 = 'dabai123'
s2 = '123456'
s3 = '100①'
s4 = 'dabai*#'
s5 = 'dabai'
index = [s1, s2, s3, s4, s5]

# 字符串只由十进制组成，s2结果应该为True，s3为False原因是①非十进制数字
for i in (index):
    print(i.isdecimal())

输出结果如下：

常用的大概就这些了！！！