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md/10.md

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```markdown
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@author jackzhenguo
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@desc
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@date 2019/2/15
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```
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#### 10 转为整型  
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int(x, base =10) , x可能为字符串或数值,将x 转换为一个普通整数。如果参数是字符串,那么它可能包含符号和小数点。如果超出了普通整数的表示范围,一个长整数被返回。

md/11.md

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```markdown
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@author jackzhenguo
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@desc
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@date 2019/2/15
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```
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#### 11 次幂
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base为底的exp次幂,如果mod给出,取余

md/12.md

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```markdown
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@author jackzhenguo
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@desc
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@date 2019/2/15
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```
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#### 12 四舍五入
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四舍五入,`ndigits`代表小数点后保留几位:

md/13.md

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```markdown
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@author jackzhenguo
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@desc
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@date 2019/2/15
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```
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#### 13 链式比较
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```python

md/14.md

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```markdown
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@author jackzhenguo
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@desc
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@date 2019/2/15
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```
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#### 14 字符串转字节  
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字符串转换为字节类型
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```python

md/15.md

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```markdown
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@author jackzhenguo
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@desc
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@date 2019/2/15
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```
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#### 15 任意对象转为字符串  
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```python
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In [14]: i = 100
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md/16.md

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```markdown
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@author jackzhenguo
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@desc
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@date 2019/2/15
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```
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#### 16 执行字符串表示的代码
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将字符串编译成python能识别或可执行的代码,也可以将文字读成字符串再编译。

md/17.md

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```markdown
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@author jackzhenguo
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@desc
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@date 2019/2/15
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```
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#### 17 计算表达式
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将字符串str 当成有效的表达式来求值并返回计算结果取出字符串中内容

md/18.md

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```markdown
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@author jackzhenguo
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@desc
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@date 2019/2/16
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```
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#### 18 字符串格式化 
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格式化输出字符串,format(value, format_spec)实质上是调用了value的__format__(format_spec)方法。

md/19.md

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```markdown
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@author jackzhenguo
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@desc
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@date 2019/2/20
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```
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#### 19 拿来就用的排序函数
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排序:

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