Python类型转换

1、整数转换为浮点数    使用函数float()

例如：将整数3转换为浮点数

>>> total_money = 20000000
>>> float(total_money)
20000000.0
>>>

2、将字符串转换为浮点数

>>> cat = "12.3"
>>> float(cat)
12.300000000000001
>>>

3、将整数和浮点数转换为字符串

>>> num = 6688
>>> str(num)
'6688'
>>>

>>> result =- 19.6
>>> str(result)
'-19.6'
>>>

4、将浮点数转换为整数

>>> price = 96.8
>>> int(price)
96
>>> round(price)
97.0
>>> round(95)
95.0
>>> round(95.5)
96.0

5、将字符串转换为数字

>>> int('5')
5
>>> float('5.6')
5.5999999999999996
>>> float('5.1')
5.0999999999999996
>>>