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Update 07-常用函数.md

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`@@ -298,6 +298,22 @@ def mode_pct(L):`
`298`	`298`	`a = df.groupby('id')['amount'].apply(mode_pct)`
`299`	`299`	```
`300`	`300`
	`301`	`+<br/>`
	`302`	`+`
	`303`	`+------`
	`304`	`+`
	`305`	`+### 计算非空唯一值`
	`306`	`+`
	`307`	+```python
	`308`	`+def uni_cnt(list_x):`
	`309`	`+ list_x = [x for x in list_x if x != None]`
	`310`	`+ list_x = [x for x in list_x if x != np.nan]`
	`311`	`+ list_x = [x for x in list_x if x != '']`
	`312`	`+ return len(set(list_x))`
	`313`	`+`
	`314`	`+a = pd.pivot_table(df, index=['Month'], values=['id'], aggfunc=nui_cnt)`
	`315`	+```
	`316`	`+`
`301`	`317`
`302`	`318`
`303`	`319`	`\| [< <目录](./README.md) \| [返回顶部 ↑](#07-常用函数) \|`

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