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Python数据分析:Pandas处理千万级数据,老板以为我用了黑科技!

  • 2026-07-02 16:33:48
Python数据分析:Pandas处理千万级数据,老板以为我用了黑科技!

Excel卡死?是时候让Pandas登场了

兄弟们好啊。

不知道你们有没有这样的经历——用Excel打开一个几十万行的数据文件,等了10分钟还没打开,或者直接电脑卡死了。

别慌。今天教你的Pandas,就是来处理这种大数据的神器。千万级数据不在话下,让你的Excel看起来像个玩具。

数据结构得先搞懂,两核心:Series和DataFrame

import pandas as pd
import numpy as np

# Series - 就是一维数组/列表
s = pd.Series([135, np.nan, 68])
print(s)

# DataFrame - 就是表格,二维的
df = pd.DataFrame({
'姓名': ['张三''李四''王五''赵六'],
'年龄': [25303540],
'工资': [8000120001500020000]
})
print(df)

读取数据,5种常见格式一键搞定

# CSV文件 - 最常用
df = pd.read_csv('data.csv')

# Excel文件
df = pd.read_excel('data.xlsx', sheet_name='Sheet1')

# JSON文件
df = pd.read_json('data.json')

# SQL数据库
from sqlalchemy import create_engine
engine = create_engine('sqlite:///mydb.db')
df = pd.read_sql('SELECT * FROM users', engine)

# 从URL直接读取
df = pd.read_csv('https://example.com/data.csv')

千万级数据处理,才是重头戏

一般人会说Pandas慢,那是他们不会优化。

import pandas as pd

# 基础操作
df = pd.read_csv('big_data.csv')

# 数据类型优化 - 省内存
df['age'] = df['age'].astype('int32')
df['salary'] = df['salary'].astype('float32')

# 只读取需要的列 - 快到飞起
df = pd.read_csv('big_data.csv', usecols=['name''age''salary'])

# 分块读取 - 内存不够的救星
chunks = pd.read_csv('big_data.csv', chunksize=100000)
for chunk in chunks:
    process(chunk)

筛选数据,一行代码搞定

# 基础筛选
df[df['age'] > 25]

# 多条件筛选
df[(df['age'] > 25) & (df['salary'] > 10000)]
df[(df['age'] < 25) | (df['salary'] > 20000)]

# 字符串筛选
df[df['name'].str.contains('张')]

# 高级筛选 - query方法
df.query('age > 25 and salary > 10000')

数据清洗,这些坑你肯定遇到过

# 处理缺失值
df.dropna()
df.fillna(0)
df['age'].fillna(df['age'].mean())

# 去除重复
df.drop_duplicates(subset=['name''age'])

# 异常值处理
df = df[df['salary'] < 100000]
df = df[df['age'].between(1865)]

# 字符串处理
df['name'] = df['name'].str.strip()
df['phone'] = df['phone'].str.replace('-''')

分组聚合,数据分析的精髓

# 简单分组统计
df.groupby('department')['salary'].mean()

# 复杂分组聚合
df.groupby('department').agg({
'salary': ['mean''max''min'],
'age''mean',
'name''count'
})

# 多级索引分组
df.groupby(['department''level'])['salary'].agg(['mean''count'])

# 实战:统计每个城市的销售情况
sales_df.groupby(['city''product']).agg({
'revenue''sum',
'quantity''sum',
'order_id''count'
}).reset_index()

数据合并,join其实很简单

# 合并两个DataFrame
pd.merge(df1, df2, on='user_id')

# 其他连接方式
pd.merge(df1, df2, on='user_id', how='left')
pd.merge(df1, df2, on='user_id', how='right')
pd.merge(df1, df2, on='user_id', how='outer')

# 追加行
pd.concat([df1, df2], ignore_index=True)

# 追加列
pd.concat([df1, df3], axis=1)

性能优化,这几招让你的代码快10倍

# 1. 用agg而不是apply
# 慢
df['new_col'] = df.apply(lambda x: x['a'] + x['b'], axis=1)
# 快
df['new_col'] = df['a'] + df['b']

# 2. 用向量化操作,别用循环
# 慢
for i in range(len(df)):
    df.loc[i, 'new'] = df.loc[i, 'a'] * 2
# 快
df['new'] = df['a'] * 2

# 3. 用query代替布尔索引
df[(df['a'] > 1) & (df['b'] < 10)]
df.query('a > 1 and b < 10')

导出数据,各种格式随便转

# 保存为CSV
df.to_csv('result.csv', index=False)

# 保存为Excel
df.to_excel('result.xlsx', sheet_name='数据', index=False)

# 保存为JSON
df.to_json('result.json', force_ascii=False, orient='records')

# 保存为Parquet
df.to_parquet('result.parquet')

# 保存为Pickle
df.to_pickle('result.pkl')

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  1. CONNECT:[ UseTime:0.000575s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000689s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.016451s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.003591s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000692s ]
  6. SELECT * FROM `set` [ RunTime:0.000692s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000621s ]
  8. SELECT * FROM `article` WHERE `id` = 495483 LIMIT 1 [ RunTime:0.005079s ]
  9. UPDATE `article` SET `lasttime` = 1783037475 WHERE `id` = 495483 [ RunTime:0.009632s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000406s ]
  11. SELECT * FROM `article` WHERE `id` < 495483 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.015878s ]
  12. SELECT * FROM `article` WHERE `id` > 495483 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.009075s ]
  13. SELECT * FROM `article` WHERE `id` < 495483 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.010858s ]
  14. SELECT * FROM `article` WHERE `id` < 495483 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001483s ]
  15. SELECT * FROM `article` WHERE `id` < 495483 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.012122s ]
0.157060s