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‎feature.md‎

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@@ -41,10 +41,18 @@ Python小例子 https://github.com/jackzhenguo/python-small-examples
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### 一、 数字
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| ID | Link |
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| ---- | --------------------------- |
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| 1 | [求绝对值](md/1.md) |
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| 2 | [进制转化](md/2.md) |
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| 3 | [整数和ASCII互转](md/3.md) |
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| 4 | [元素都为真检查](md/4.md) |
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| 5 | [至少一个为真检查](md/5.md) |
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| ID | 链接 | 难度 |
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| ---- | --------------------------- | ---- |
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| 1 | [求绝对值](md/1.md) | |
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| 2 | [进制转化](md/2.md) | |
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| 3 | [整数和ASCII互转](md/3.md) | |
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| 4 | [元素都为真检查](md/4.md) | |
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| 5 | [至少一个为真检查](md/5.md) | |
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| 6 | [判断是真是假](md/6.md) | |
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| 7 | [创建复数](md/7.md) | |
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| 8 | [取商和余数](md/8.md) | |
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| 9 | [转为浮点类型](md/9.md) | |
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| 10 | [转为整型](md/10.md) | |
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| 11 | [次幂](md/11.md) | |
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| 12 | [四舍五入](md/12.md) | |
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| 13 | [链式比较](md/13.md) | |

‎md/10.md‎

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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。
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```python
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In [1]: int('12',16)
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Out[1]: 18
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```

‎md/11.md‎

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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
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```python
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In [1]: pow(3, 2, 4)
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Out[1]: 1
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```

‎md/12.md‎

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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：
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```python
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In [11]: round(10.0222222, 3)
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Out[11]: 10.022
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In [12]: round(10.05,1)
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Out[12]: 10.1
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```

‎md/13.md‎

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#### 13 链式比较
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```python
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i = 3
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print(1 < i < 3) # False
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print(1 < i <= 3) # True
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```

‎md/6.md‎

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#### 6 判断是真是假　　
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测试一个对象是True, 还是False.
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```python
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In [9]: bool([0,0,0])
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Out[9]: True
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In [10]: bool([])
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Out[10]: False
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In [11]: bool([1,0,1])
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Out[11]: True
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```

‎md/7.md‎

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#### 7 创建复数
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创建一个复数
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```python
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In [1]: complex(1,2)
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Out[1]: (1+2j)
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```

‎md/8.md‎

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#### 8 取商和余数　　
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分别取商和余数
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```python
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In [1]: divmod(10,3)
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Out[1]: (3, 1)
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```

‎md/9.md‎

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#### 9 转为浮点类型　
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将一个整数或数值型字符串转换为浮点数
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```python
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In [1]: float(3)
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Out[1]: 3.0
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```
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如果不能转化为浮点数，则会报`ValueError`:
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```python
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In [2]: float('a')
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# ValueError: could not convert string to float: 'a'
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```

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