1、lstrip和rstrip
2、lower和upper
3、startswith和endswith
4、rsplit
5、join
6、replace
7、isdigit

"""
需要掌握的方法如下：
1、lstrip和rstrip
2、lower和upper
3、startswith和endswith
4、rsplit
5、join
6、replace
7、isdigit

"""

1、lstrip和rstrip

name='&&nick&&'
print(f"nick.lstrip('&'):{name.lstrip('&')}")
print(f"nick.rstrip('&'):{name.rstrip('&')}")

2、lower和upper

name='luzhaoshAN'
print(f"name.lower:{name.lower()}")
print(f"name.upper:{name.upper()}")

3、startswith和endswith

name='Nick Chen'
print(f"name.startswith(Nick):{name.startswith('N')}")
print(f"name.endswith(Chen):{name.endswith('m')}")

4、rsplit() 从右开始切割

info='nick:male:19'
print(f"info.rsplit(:,1):{info.rsplit(':',1)}")

5、join()

lis1=[1,2,'19']

print(f"':',join(lis):{':'.join(lis)}")#报错数字不可与字符串拼接

lis = ['nick', 'male', '19']
print(f"{':'.join(lis)}")

6、replace()

name='nick shuai'
print(f"name.replace('shuai','handsome'):{name.replace('shuai','handsome')}")

7、isdigit() 判断输入是否是数字结果为true或false

salary='1111'
print(salary.isdigit())
salary2='111.1'
print(salary.isdigit())