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