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从零开始学Python数据清洗(九)

  • 2026-07-01 17:41:35
从零开始学Python数据清洗(九)

数据筛选、过滤与排序

"帮我拉一下技术部工资超过1万的员工名单,按入职时间排个序。" "把今年下单超过3次的VIP客户筛出来。" 这种需求几乎是数据分析的日常。如果用Excel一点点手动筛选,鼠标点到手抽筋。掌握Pandas的布尔索引、.query()和排序方法,一句话搞定。

文中涉及到的数据文件可以联系我发给你,因为我还不知道怎么在公众号插入文件


一、布尔索引:筛选的本质是"判断对错"

Pandas筛选的核心原理很简单:对每一行判断条件是否成立,结果是 True 的行保留,False 的行丢弃。

import pandas as pd
import
 numpy as np

df = pd.read_csv('data_python/employee_data.csv')

# 先做个类型清理

df['age'] = pd.to_numeric(df['age'], errors='coerce')
df['salary'] = pd.to_numeric(df['salary'], errors='coerce')
df['hire_date'] = pd.to_datetime(df['hire_date'], errors='coerce')

# 条件本身就是一个布尔Series

condition = df['salary'] > 10000
print
(condition.head())
# 0     True

# 1    False

# 2    False

# ...

# dtype: bool


# 用这个布尔Series筛选

high_salary = df[df['salary'] > 10000]
print
(f"工资超10000的员工:{len(high_salary)} 人")

理解这段话就理解了Pandas筛选的一切:df[条件] 返回条件为True的那些行


二、多条件组合:& | ~ 三剑客

实际工作中几乎没有单一条件的筛选。多个条件组合时,有两条铁律:

铁律1:每个条件必须用括号包起来
铁律2:用 &(与)、|(或)、~(非)连接,不能用 and/or/not

# ❌ 错误写法
df[df['salary'] > 10000 and df['department'] == '技术部']

# ✅ 正确写法

df[(df['salary'] > 10000) & (df['department'] == '技术部')]

# 技术部或市场部且工资>1万

df[((df['department'] == '技术部') | (df['department'] == '市场部')) & 
   (df['salary'] > 10000)]

# 不是技术部的员工

df[~(df['department'] == '技术部'])]

# 多个取反:不是技术部也不是财务部

df[~(df['department'].isin(['技术部', '财务部']))]

# 筛选有缺失值的行

df[df['salary'].isna() | df['age'].isna()]

为什么不能用 and/or Python中 and/or 作用于单个布尔值,而 &/| 作用于元素级的布尔数组。对Series而言,你需要的是逐元素运算。

初学者最容易犯的错:忘记加括号。df['salary'] > 10000 & df['department'] == '技术部' 会报错,因为 & 优先级高于 >每个条件都加括号,永远不亏


三、.query():像写SQL一样筛选

如果觉得满屏括号太累眼睛,.query() 让你用字符串写筛选条件,干净清爽。

# 布尔索引写法
df[(df['salary'] > 10000) & (df['department'] == '技术部')]

# .query()写法——是不是清爽多了?

df.query('salary > 10000 and department == "技术部"')

# 多条件

df.query('salary > 10000 and department in ["技术部", "市场部"]')

# 引用外部变量用 @

min_salary = 10000
target_dept = '技术部'
df.query('salary > @min_salary and department == @target_dept')

# 字符串部分匹配

df.query('name.str.contains("张")', engine='python')

# 日期筛选

df.query('hire_date >= "2020-01-01"')

# 筛选非空

df.query('salary == salary')  # NaN != NaN,所以 salary == salary 排除NaN

# 排除某个部门

df.query('department != "技术部"')

布尔索引 vs .query() 怎么选?

场景
推荐方式
简单条件
.query()
 更易读
条件用变量动态生成
.query()
 + @变量
非常复杂的条件嵌套
布尔索引更灵活
列名含空格或特殊字符
布尔索引(.query()不支持)

四、.loc[] 与 .iloc[]:精准定位

筛选不止能选,还能同时选.loc[] 按标签(名字)选,.iloc[] 按位置(整数)选。

# --- loc:按标签(列名+索引名)选 ---
# 基本格式:df.loc[行的条件, 列的列表]

df.loc[df['salary'] > 10000, ['name', 'department', 'salary']]

# 只选列(所有行)

df.loc[:, ['name', 'salary']]

# 只选行

df.loc[df['department'] == '技术部']

# 按索引名切片(包含两端)

df.loc['EMP0050':'EMP0100', ['name', 'salary']]

# --- iloc:按位置(整数索引)选 ---

# 前10行的name和salary列

df.iloc[:10, [1, 7]]

# 第5到第15行,第2到第5列

df.iloc[5:15, 2:5]

# 最后5行

df.iloc[-5:]

# 选特定行和列

df.iloc[[0, 10, 50], [1, 6, 7]]

# 混合使用:先用布尔条件取行号,再用iloc

target_rows = df[df['salary'] > 10000].index
df.loc[target_rows, ['name', 'department', 'salary']].head()

loc 与 iloc 的核心区别:

.loc[].iloc[]
选择依据
标签(名字)
位置(整数)
切片包含
包含两端
不包含末端(Python惯例)
典型用途
df.loc[df['x']>5, ['a','b']]df.iloc[:100, :5]

记忆口诀loc = label(标签),iloc = integer location(整数位置)。


五、.isin() 与 .between():快速范围筛选

当你想筛选某个列的取值属于一个列表或落在某个区间时,这两个方法比布尔索引更简洁。

# --- isin:值在列表中 ---
# 筛选特定部门

target_depts = ['技术部', '市场部']
df[df['department'].isin(target_depts)]

# 筛选特定学历

edu_levels = ['本科', '硕士']
high_edu = df[df['education'].isin(edu_levels)]

# 排除某几个值(加 ~ 取反)

df[~df['department'].isin(['技术部', '财务部'])]

# --- between:值在区间内 ---

# 年龄在30到45之间

df[df['age'].between(30, 45)]

# between默认包含两端(左闭右闭),可改为左开右闭

df[df['age'].between(30, 45, inclusive='left')]

# 工资在1万到2万之间

mid_salary = df[df['salary'].between(10000, 20000)]

# 入职日期在2020年到2023年之间

df[df['hire_date'].between('2020-01-01', '2023-12-31')]

六、.where() 与 .mask():保留形状的筛选

where() 不会删除行,而是把不满足条件的变成 NaN。适合保持数据结构完整的场景。

# where:条件为False的位置变成NaN
df['high_salary_only'] = df['salary'].where(df['salary'] > 10000)

# mask:where的反义词(条件为True的位置变NaN)

df['non_tech_salary'] = df['salary'].mask(df['department'] == '技术部')

# 多列同时where

tech_employees = df[['name', 'salary']].where(df['department'] == '技术部')

# 给NaN设置默认值

df['salary'].where(df['salary'] > 10000, other=0)

where vs 布尔索引的选择逻辑:

  • • 需要浓缩数据、减少行数:用布尔索引
  • • 需要保持原始行列结构、只隐藏部分值:用 where

七、排序:让数据井井有条

sort_values():按列排序

# 按工资升序(默认ascending=True)
df_sorted = df.sort_values('salary')

# 按工资降序

df_sorted = df.sort_values('salary', ascending=False)

# 按多列排序:先部门,再工资(同部门内按工资排序)

df_sorted = df.sort_values(['department', 'salary'], 
                           ascending=[True, False])

# 按日期排序

df_sorted = df.sort_values('hire_date', na_position='first')

# 排完序重置索引

df_sorted = df.sort_values('salary', ascending=False).reset_index(drop=True)

# 查看工资最高的10个人

top10 = df.sort_values('salary', ascending=False).head(10)
print
(top10[['name', 'department', 'salary']])

nlargest() / nsmallest():直接取前N/后N

# 工资最高的5人(比排序后.head()更高效)
df.nlargest(5, 'salary')[['name', 'department', 'salary']]

# 工资最低的5人

df.nsmallest(5, 'salary')[['name', 'department', 'salary']]

# 按多列:年龄最大,如果年龄相同再比工资

df.nlargest(10, ['age', 'salary'])

# 按部门分别取工资前3名

df.groupby('department').apply(
    lambda
 x: x.nlargest(3, 'salary')
).reset_index(drop=True)

性能提示nlargest() 和 nsmallest() 比全量排序再取头尾更快,尤其在大数据上。但它们只能取最大/最小的N个,不能做任意排序。


八、实战:多维度筛选员工数据

import pandas as pd
import
 numpy as np

df = pd.read_csv('data_python/employee_data.csv')

# 数据预处理

df['age'] = pd.to_numeric(df['age'], errors='coerce', downcast='integer')
df['salary'] = pd.to_numeric(df['salary'], errors='coerce', downcast='float')
df['hire_date'] = pd.to_datetime(df['hire_date'], errors='coerce')
df['department'] = df['department'].replace('nan', np.nan)

# ========== 任务1:技术部工资>1万,按工资降序 ==========

tech_high = (
    df.query('department == "技术部" and salary > 10000')
    .sort_values('salary', ascending=False)
    [['name', 'salary', 'hire_date', 'education']]
)
print
("技术部高薪员工(前5):")
print
(tech_high.head())

# ========== 任务2:2020年后入职的硕士员工 ==========

recent_masters = df[
    (df['hire_date'] >= '2020-01-01') &
    (df['education'] == '硕士')
].sort_values('hire_date')

print
(f"\n2020年后入职的硕士:{len(recent_masters)} 人")

# ========== 任务3:各部门工资前三名 ==========

top3_by_dept = (
    df.groupby('department')
    .apply(lambda x: x.nlargest(3, 'salary'))
    .reset_index(drop=True)
    [['department', 'name', 'salary']]
)
print
("\n各部门工资前三名:")
print
(top3_by_dept)

# ========== 任务4:异常值排查 ==========

# 年龄异常(<18 或 >80)

age_outliers = df[~df['age'].between(18, 80) | df['age'].isna()]
print
(f"\n年龄异常:{len(age_outliers)} 人")

# 工资异常(<1000 或 >500000)

salary_outliers = df[~df['salary'].between(1000, 500000) | df['salary'].isna()]
print
(f"工资异常:{len(salary_outliers)} 人")

# ========== 任务5:计算各维度统计 ==========

print
(f"\n--- 数据概览 ---")
print
(f"技术部人数:{(df['department'] == '技术部').sum()}")
print
(f"硕士及以上学历:{(df['education'].isin(['硕士', '博士'])).sum()}")
print
(f"平均工资(排除异常):{df['salary'].between(1000, 500000).mean()}")
print
(f"2024年入职:{df[df['hire_date'].dt.year == 2024].shape[0]} 人")

小结

操作
方法
关键点
单条件筛选
df[df['col'] > value]
条件产生布尔Series
多条件组合
df[(A) & (B) | (C)]必须加括号
SQL风格筛选
df.query('...')
字符串写条件
按标签选
df.loc[rows, cols]
按列名/行名
按位置选
df.iloc[row_idx, col_idx]
按整数索引
值在列表中
df['col'].isin([...])
比多条件OR简洁
值在区间内
df['col'].between(a, b)
两端默认包含
条件保留/隐藏
df['col'].where(cond)
False变NaN,保持结构
排序
df.sort_values('col')
ascending控制升降
取前/后N
df.nlargest(N, 'col')
比排序后.head()更快

下一篇预告:数据合并与连接——用 merge() 把多张表关联起来,用 concat() 上下拼接,用 join() 按索引合并。彻底告别"开五个Excel窗口来回复制粘贴"的噩梦。

#数据筛选 #loc #iloc #query #Pandas #sort_values #排序

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  1. CONNECT:[ UseTime:0.000721s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000860s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000375s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000327s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000518s ]
  6. SELECT * FROM `set` [ RunTime:0.004610s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000767s ]
  8. SELECT * FROM `article` WHERE `id` = 497322 LIMIT 1 [ RunTime:0.000556s ]
  9. UPDATE `article` SET `lasttime` = 1783027405 WHERE `id` = 497322 [ RunTime:0.004946s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000261s ]
  11. SELECT * FROM `article` WHERE `id` < 497322 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000619s ]
  12. SELECT * FROM `article` WHERE `id` > 497322 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.004856s ]
  13. SELECT * FROM `article` WHERE `id` < 497322 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001734s ]
  14. SELECT * FROM `article` WHERE `id` < 497322 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002270s ]
  15. SELECT * FROM `article` WHERE `id` < 497322 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001690s ]
0.099677s