python数据类型转换&&格式化输出

①python的数据类型包含：数字、字符串、列表、元组、字典、集合这六种基本数据类型。不同数据类型的数据可以进行类型的转换。

使用input让用户输入的数据默认为字符串类型；

 name = input("name:")
 age = input("age:")
 print(type(name))
 print(type(age), type(int(age)))

 >>>name:xiaoming
 >>>age:20
 <class 'str'>
 <class 'str'> <class 'int'>

②格式化输出主要使用以下三种方式：

 name = input("name:")
 age = int(input("age:"))
 job = input("job:")
 salary = input("salary:")

方式一、
1 info = '''
 -------- info of  %s  -----            #%s，%d 为占位符
 Name:%s
 Age:%d
 Job:%s
 Salary:%s
 ''' % (name,name,age,job,salary)
8 print(info)

>>>name:xiaoming
>>>age:20
>>>job:python developer
>>>salary:10000
-------- info of xiaoming -----
Name:xiaoming
Age:20
Job:python developer
Salary:10000

 方式二、
 1 info2 = '''
 -------- info of {_name}  -----
 Name:{_name}
 Age:{_age}
 Job:{_job}
 Salary:{_salary}
 '''.format(_name=name,
            _age=age,
            _job=job,
            _salary=salary)

>>>name:xiaoming
>>>age:20
>>>job:python developer
>>>salary:10000
-------- info of xiaoming -----
Name:xiaoming
Age:20
Job:python developer
Salary:10000

方式三、
1 info3 =  '''
 -------- info of {0} -----
 Name:{0}
 Age:{1}
 Job:{2}
 Salary:{3}
 '''.format(name,age,job,salary)

>>>name:xiaoming
>>>age:20
>>>job:python developer
>>>salary:10000
-------- info of xiaoming -----
Name:xiaoming
Age:20
Job:python developer
Salary:10000