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Python数据分析:Seaborn可视化

  • 2026-02-06 01:19:08
Python数据分析:Seaborn可视化

📊 用 Seaborn 做图,比点外卖还简单?Python 数据可视化真香指南!

你是不是也经历过这样的崩溃时刻?

  • 用 Matplotlib 画个图,调颜色调到眼瞎;
  • 想加个背景网格线,结果代码比泡面说明书还长;
  • 最后做出来的图,看起来像上世纪90年代的PPT……

别慌!今天带你认识一位 Python 可视化界的“高颜值暖男”——Seaborn

它不光长得好看(默认配色高级感拉满),脾气还好(API 简洁易懂),关键是——它能让你的数据讲出故事


🎨 1. Seaborn 是啥?Matplotlib 的“美颜滤镜”!

Seaborn 并不是要取代 Matplotlib,而是给它套了个“高定西装”。你可以把它理解为 Matplotlib 的高级封装,专治各种“丑图焦虑”。

import seaborn as sns

对,就这一行,你就已经站在了时尚前沿 👗

💡 生活类比:Matplotlib 是素颜,Seaborn 是开了“原相机+柔光+磨皮”的你。


🖌️ 2. 风格设置:5种主题,总有一款适合你

Seaborn 提供了5种预设主题:

  • darkgrid(默认):深色网格,学术范儿
  • whitegrid:清爽干净,适合汇报
  • dark / white:极简主义
  • ticks:复古风,带刻度线
sns.set_style("whitegrid")

想临时换个风格?用 with 语句,就像试穿衣服,不买也行:

with sns.axes_style("darkgrid"):    plt.plot([123], [456])# 出了这个 with,风格自动恢复!

💡 小技巧:sns.despine() 可以“去边框”,比如去掉右边和上边的轴线,让图更干净:

sns.despine(left=True, bottom=True)  # 连左边和底边都不要了!极简到骨子里

🔍 3. 字体与缩放:从论文到海报,一键切换

Seaborn 还贴心地考虑了你的使用场景,提供4种上下文模式:

  • paper:适合写论文
  • notebook(默认):日常分析
  • talk:做演讲
  • poster:贴墙展示(字体超大!)
sns.set_context("poster", font_scale=1.5)

💡 类比:这就像是把手机字体从“正常”调成“爷爷模式”——看得清,才安心!


📈 4. 直方图 + 密度图:看清数据的“身材”

想知道某列数据是“瘦高型”还是“矮胖型”?用 distplot(旧版)或 histplot/kdeplot(新版):

sns.distplot(df_iris['Petal.Width'], kde=True, rug=True)
  • kde=True:画密度曲线(像山峰轮廓)
  • rug=True:在底部加“毛毯线”,显示每个数据点位置

💡 生活例子:这就像体检时不仅看平均身高,还看身高分布——班上有没有几个“姚明”?


🌸 5. 散点图三剑客:stripplot、swarmplot、pairplot

✅ stripplot:基础散点,但可能重叠

sns.stripplot(x='Species', y='Petal.Width', data=df_iris)

✅ 加 jitter=True:抖一抖,避免重叠

sns.stripplot(x='Species', y='Petal.Width', data=df_iris, jitter=True)

✅ swarmplot:智能排布,绝不重叠!

sns.swarmplot(x='Species', y='Petal.Width', data=df_iris)

💡 类比:stripplot 像地铁早高峰挤成一团;swarmplot 则是大家自觉排队,人人有座!

✅ pairplot:一键生成“相亲角”矩阵图

sns.pairplot(df_iris, hue='Species')

所有变量两两对比,还能按类别上色——找相关性神器!


📦 6. 箱线图 & 小提琴图:数据分布的“体检报告”

📦 箱线图(boxplot):看中位数、四分位、异常值

sns.boxplot(x='Species', y='Petal.Width', data=df_iris)

🎻 小提琴图(violinplot):箱线图 + 密度图 = 更丰满!

sns.violinplot(x='Species', y='Petal.Width', data=df_iris)

中间白点是中位数,胖的地方表示数据密集——像不像数据的“腰围”?

💡 类比:箱线图是体检报告里的“指标范围”,小提琴图则是“全身体脂分布图”!


📊 7. 柱状图 & 计数图:谁最受欢迎?

📊 barplot:默认显示均值(带误差线!)

sns.barplot(x='Species', y='Petal.Length', data=df_iris)

📊 countplot:直接统计频次,不用手动 groupby!

sns.countplot(x='class', hue='who', data=titanic)

💡 场景:想知道头等舱里男性多还是女性多?countplot 一秒出结果!


🔗 8. 多变量关系图:jointplot & regplot

🔗 jointplot:两个变量的关系 + 各自分布

sns.jointplot(x='Petal.Length', y='Petal.Width', data=df_iris)

想更高级?换成 kind='kde',变成等高线密度图:

sns.jointplot(x='Petal.Length', y='Petal.Width', data=df_iris, kind='kde')

📉 regplot:一键拟合回归线,看趋势

sns.regplot(x='total_bill', y='tip', data=tips)

💡 类比:regplot 就像问:“你花得越多,小费给得越多吗?”——答案藏在斜率里!


🌈 9. relplot:关系图的“瑞士军刀”

relplot 是 Seaborn 的“全能选手”,通过 kind 参数切换散点图 or 折线图:

sns.relplot(x="total_bill", y="tip", hue="day", col="time", data=tips)
  • hue:按颜色分组(比如星期几)
  • col:按列分面(比如午餐 vs 晚餐)

💡 效果:一张图,讲清多个维度的故事!


🔥 10. 热力图(heatmap):一眼看出“热点区域”

相关性矩阵太枯燥?画成热力图!

corr = df_iris.corr()sns.heatmap(corr, annot=True, cmap='coolwarm')

颜色越红,正相关越强;越蓝,负相关越强。

💡 应用场景:老板问“哪些特征最相关?”——甩出这张图,升职加薪不是梦!


✅ 总结:Seaborn 的三大优势

  1. 颜值高:默认配色、字体、布局都经过精心设计;
  2. 代码少:一行代码搞定复杂图表;
  3. 洞察强:从分布到关系,从单变量到多变量,全覆盖!

🎁 彩蛋:想快速恢复默认设置?

sns.set()  # 一键 reset,回到初心

现在,轮到你了!打开 Jupyter Notebook,敲下 import seaborn as sns让你的数据,从此“貌美如花” 💐


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  1. CONNECT:[ UseTime:0.000774s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000687s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000617s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000313s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000516s ]
  6. SELECT * FROM `set` [ RunTime:0.008530s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000829s ]
  8. SELECT * FROM `article` WHERE `id` = 467957 LIMIT 1 [ RunTime:0.009031s ]
  9. UPDATE `article` SET `lasttime` = 1770484968 WHERE `id` = 467957 [ RunTime:0.004471s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.007444s ]
  11. SELECT * FROM `article` WHERE `id` < 467957 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.008817s ]
  12. SELECT * FROM `article` WHERE `id` > 467957 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.010247s ]
  13. SELECT * FROM `article` WHERE `id` < 467957 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005824s ]
  14. SELECT * FROM `article` WHERE `id` < 467957 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003221s ]
  15. SELECT * FROM `article` WHERE `id` < 467957 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002246s ]
0.135331s