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一起学Python第97天: Pandas数据分析相关技能

  • 2026-07-02 07:54:47
一起学Python第97天: Pandas数据分析相关技能

欢迎来到【一起学Python】第97天!

掌握描述性统计、相关性分析、数据透视表和时间序列这四大核心技能,你就能从海量数据中快速提炼业务洞察,让数据真正"开口说话"!

描述性统计:快速读懂数据"性格"

描述性统计是数据分析的"第一道关卡",用几个关键指标快速把握数据分布特征。

 基础统计量计算

import pandas as pdimport numpy as np# 创建示例数据df = pd.DataFrame({    'Sales': [1200, 1500, 1800, 2100, 2400, np.nan],    'Profit': [300, 450, 520, 680, 750, 820],    'Region': ['East''West''East''West''East''West']})# 均值:反映"平均水平"print("🔹 销售额均值:"df['Sales'].mean())      # 1800.0(自动忽略NaN)# 中位数:反映"中间水平",抗异常值print("🔹 利润中位数:"df['Profit'].median())   # 600.0# 方差/标准差:反映"波动程度"print("🔹 销售额标准差:"df['Sales'].std())     # 469.04# 分位数:定位数据分布位置print("🔹 利润25%/50%/75%分位数:\n"      df['Profit'].quantile([0.25, 0.5, 0.75]))

 一键生成统计报告

# describe() 一次性输出核心统计量print("\n🔹 数值列描述性统计:\n", df.describe())# 自定义统计量(更灵活!)custom_stats = df['Profit'].agg([    'count''mean''median''std'    'min', lambda x: x.quantile(0.9), 'max'  # 支持自定义函数!])print("\n🔹 自定义统计报告:\n", custom_stats)

业务应用:用 describe() 快速筛查异常值(如最大值远超99%分位数),为后续清洗提供依据。

相关性分析:发现变量间的"隐藏关系"

相关性分析帮你判断:销售额涨了,利润一定涨吗?广告投放和转化率有关联吗?

计算相关系数

# Pearson相关系数(线性关系,-1~1)corr_sales_profit = df['Sales'].corr(df['Profit'])print("🔹 销售额与利润的相关系数:", corr_sales_profit)  # 0.98 → 强正相关# 多变量相关性矩阵corr_matrix = df[['Sales''Profit']].corr()print("\n🔹 相关性矩阵:\n", corr_matrix)

可视化相关性(热力图)

import matplotlib.pyplot as pltimport seaborn as sns# 设置中文字体(避免乱码)plt.rcParams['font.sans-serif'] = ['SimHei']plt.rcParams['axes.unicode_minus'] = False# 绘制热力图plt.figure(figsize=(64))sns.heatmap(corr_matrix, annot=True, cmap='coolwarm', center=0)plt.title('变量相关性热力图')plt.tight_layout()plt.show()
效果:颜色越红表示正相关越强,越蓝表示负相关越强,数字直接显示相关系数。
重要提醒
  • corr() 默认计算 Pearson 相关系数,仅衡量线性关系
  • 相关≠因果!高相关可能是巧合或受第三变量影响
  • 非线性关系需用 df['A'].corr(df['B'], method='spearman')

数据透视表

数据透视表(Pivot Table)让你像操作Excel一样,轻松实现"拖拽式"多维汇总。

基础透视:单维度汇总

# 创建业务数据df_pivot = pd.DataFrame({    'Date': pd.date_range('2024-01-01', periods=6),    'Region': ['East''East''West''West''East''West'],    'Product': ['A''B''A''B''A''B'],    'Sales': [100150200250120180]})# 按区域汇总销售额pivot_region = df_pivot.pivot_table(    values='Sales'    index='Region'    aggfunc='sum'  # 汇总函数:sum/mean/count等)print("🔹 各区域总销售额:\n", pivot_region)

高级透视:多维度+多重聚合

# 按"区域×产品"交叉汇总,同时计算总和与均值pivot_multi = df_pivot.pivot_table(    values='Sales',    index='Region',    columns='Product',  # 列维度    aggfunc=['sum''mean'],  # 多重聚合    fill_value=0,  # 缺失值填充    margins=True,  # 添加总计行/列    margins_name='总计')print("\n🔹 区域×产品多维透视表:\n", pivot_multi)

透视表 + 分组聚合(更灵活!)

# 用 groupby + agg 实现自定义透视逻辑custom_pivot = df_pivot.groupby(['Region''Product']).agg({    'Sales': ['sum''mean''count'],    'Date''min'  # 最早销售日期}).round(2)  # 保留2位小数print("\n🔹 自定义聚合透视:\n", custom_pivot)
核心优势pivot_table 适合快速探索,groupby+agg 适合复杂业务逻辑,两者结合威力翻倍!

时间序列分析:捕捉趋势与周期

时间序列数据(如日活、股价、销量)蕴含趋势、季节性和周期性,是业务预测的基础。

创建与索引时间序列

# 生成日期索引dates = pd.date_range(start='2024-01-01', periods=30, freq='D')# 创建时间序列DataFramedf_time = pd.DataFrame({    'Date': dates,    'Daily_Sales': np.random.randint(100, 300, size=30)}).set_index('Date')  # 关键:设日期为索引!print("🔹 时间序列前5行:\n", df_time.head())

重采样:粒度转换(日→周/月)

# 日数据 → 周汇总(求和)weekly_sales = df_time.resample('W').sum()print("\n🔹 周度销售额:\n", weekly_sales.head())# 日数据 → 月均值monthly_avg = df_time.resample('M').mean()print("\n🔹 月均销售额:\n", monthly_avg.head())
常用频率别名'D'=天, 'W'=周, 'M'=月末, 'Q'=季度, 'Y'=年

趋势可视化 + 移动平均

# 绘制原始数据 + 7日移动平均线df_time['MA7'] = df_time['Daily_Sales'].rolling(window=7).mean()plt.figure(figsize=(125))plt.plot(df_time.index, df_time['Daily_Sales'], label='日销售额', alpha=0.6)plt.plot(df_time.index, df_time['MA7'], label='7日移动平均', linewidth=2, color='red')plt.title('销售额趋势分析')plt.xlabel('日期')plt.ylabel('销售额')plt.legend()plt.grid(True, alpha=0.3)plt.tight_layout()plt.show()

业务价值:移动平均可平滑短期波动,更清晰识别长期趋势,是预测模型的前置步骤。

核心避坑指南(实战必看)

综合实战:销售数据分析流水线

将今日知识点串联,模拟真实业务场景:
import pandas as pdimport numpy as npimport matplotlib.pyplot as pltimport seaborn as sns# 1. 构造业务数据np.random.seed(42)dates = pd.date_range('2024-01-01', periods=90, freq='D')df = pd.DataFrame({    'Date': dates,    'Region': np.random.choice(['East''West''North'], 90),    'Product': np.random.choice(['A''B''C'], 90),    'Sales': np.random.randint(10050090) + np.sin(np.arange(90)/10)*50,  # 加趋势    'Profit': np.random.randint(3015090)})df.loc[np.random.choice(df.index, 5), 'Sales'] = np.nan  # 模拟缺失# 2. 描述性统计print("🔹 核心指标概览:")print(df[['Sales''Profit']].describe().round(2))# 3. 相关性分析corr = df[['Sales''Profit']].corr().round(3)print("\n🔹 销售-利润相关性:", corr.iloc[0,1])# 4. 数据透视:区域×产品销售额pivot = df.pivot_table(    values='Sales'    index='Region'    columns='Product'    aggfunc='sum',    fill_value=0,    margins=True,    margins_name='合计').round(0)print("\n🔹 区域×产品透视表:\n", pivot)# 5. 时间序列分析df_ts = df.set_index('Date').sort_index()df_ts['Sales_MA7'] = df_ts['Sales'].rolling(7, min_periods=1).mean()# 6. 可视化fig, axes = plt.subplots(21, figsize=(128))# 热力图sns.heatmap(corr, annot=True, cmap='RdYlGn', ax=axes[0])axes[0].set_title('变量相关性热力图')# 趋势图axes[1].plot(df_ts.index, df_ts['Sales'], label='日销售额', alpha=0.5)axes[1].plot(df_ts.index, df_ts['Sales_MA7'], label='7日移动平均', color='red', linewidth=2)axes[1].set_title('销售额趋势分析')axes[1].legend()axes[1].grid(True, alpha=0.3)plt.tight_layout()plt.show()print("\n✅ 分析完成!关键结论:")print(f"  • 销售与利润强相关 (r={corr.iloc[0,1]:.3f})")print(f"  • West区域Product B销售额最高 ({pivot.loc['West''B']:.0f})")print(f"  • 近期销售额呈上升趋势(移动平均线向上)")

今日知识点

核心心法

  1. 分析前先 df.info() + df.describe(),快速建立数据认知
  2. 相关性分析务必结合业务逻辑解读,避免"伪相关"陷阱
  3. 时间序列分析三要素:趋势(长期方向)、季节性(固定周期波动)、残差(随机噪声)
一起学Python每天进步一点点,365天后遇见更优秀的自己!

🎯 今日金句:"统计是数据的语言,透视是洞察的窗口;读懂数字背后的故事,才是分析的真正价值。"

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  1. CONNECT:[ UseTime:0.001028s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001372s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.022667s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.018724s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001398s ]
  6. SELECT * FROM `set` [ RunTime:0.028656s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001631s ]
  8. SELECT * FROM `article` WHERE `id` = 496176 LIMIT 1 [ RunTime:0.084378s ]
  9. UPDATE `article` SET `lasttime` = 1783005984 WHERE `id` = 496176 [ RunTime:0.106921s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.011013s ]
  11. SELECT * FROM `article` WHERE `id` < 496176 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.016894s ]
  12. SELECT * FROM `article` WHERE `id` > 496176 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.071067s ]
  13. SELECT * FROM `article` WHERE `id` < 496176 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.080455s ]
  14. SELECT * FROM `article` WHERE `id` < 496176 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.082562s ]
  15. SELECT * FROM `article` WHERE `id` < 496176 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.056153s ]
0.759588s