判断是不是数字isdigit()

判断salary是不是数字，假如是数字就正常执行，不是数字就打印must input digit的提示，

salary=input("salary:")

if salary.isdigit():
    salary  = int(salary)
else:
    print("must input digit")



输出结果：
salary:80

salary:sds

Traceback (most recent call last):
File "F:/python/week1/day5/test.py", line 1, in <module>
'''%(name,name,age,job,salary,int(65-age),int(salary))
ValueError: invalid literal for int() with base 10: 'sds