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<>目录:
1.数据类型
2.数据的应用
3. 数据的转换
<>笔记
1.数据类型
* 字符串:(str)字符串类型必须有【引号】的辅助
* 整数:(int)普通的整数数字
* 浮点数:(float)带小数点的数字
2.数据的应用
*
四则运算
简单运算优先级口诀:从左到右顺着来,括号里的优先算,乘除排在加减前。
*
字符串的拼接
方法:用“+”号将数据进行拼接 目的:数据整合
不同类型的数据不能拼接在一起呢?一句话:圈子不同不相融。
*
数据类型的查询函数
type()函数 作用:查询数据类型 示例:print(type('查询的内容'))
3.数据的转换
*
str():将其他数据类型转成字符串 或者直接是引号转换(‘需要转换成字符喜欢的内容’)
*
int():将其他数据类型转成整数
只有符合整数规范的字符串类数据,才能被int()强制转换。 别看它虽然只有一句话,但它其实带有三层含义:
首先,整数形式的字符串比如'6'和'1',可以被int()函数强制转换。 其次,文字形式,比如中文、火星文或者标点符号,不可以被int()函数强制转换。
最后,小数形式的字符串,由于Python的语法规则,也不能使用int()函数强制转换。
*
float():将其他数据类型转成浮点数