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matplotlib学习笔记1 —— 快速开始

  • 2026-06-01 03:15:56
matplotlib学习笔记1 —— 快速开始

数据可视化,即将数据绘制成图表,在数据分析中非常重要。数据可视化可以直观呈现数据,快速发现规律,定位异常问题,对比关联分析,简化复杂信息以及高效沟通回报等。可视化的工具包非常多,有R语言中的ggplot2、pheatmap,有python中的matplotlib、seaborn、plotnine、PyComplexHeatmap等。seaborn、plotnine等都是构建在matplotlib库之上的,seaborn、plotnine可以帮助我们快速绘制图形,而matplotlib则可以高度精细化定制绘图。从今天起一起学习matplotlib绘图python库。

matplotlib简单介绍

Matplotlib 是一个功能全面的 Python 可视化库,用于创建静态、动态和交互式可视化图表。

  • 创造 出版级图表 。

  • 制作 可缩放、平移、更新的交互式图形 。

  • 定制 视觉风格和 布局 。

  • 导出到 多种文件格式 。

  • 嵌入 JupyterLab 和图形用户界面 。

  • 丰富的基于 Matplotlib 构建的第三方软件包 。

快速开始

编写使用matplotlib绘制图形的代码有两种风格:面向对象和面向过程的风格。推荐使用面向对象的编程风格。

导入所需模块

# 导入所需模块import numpy as np  # 用于准备数据import matplotlib as mplimport matplotlib.pyplot as plt  # 直接用于绘图的API在pyplot子模块中

numpy库用于准备数据,matplotlib模块通常别名设置为mpl,该模块包含了几个常用的实例,用于全局设置默认值和样式的mpl.rcParams,按名字存放颜色映射ColorMap的容器mpl.colormaps,按名字存放颜色序列ColorSequence的容器mpl.color_sequences。matplotlib有非常多的子模块,其中pyplot模块是一个基于状态的 matplotlib 接口,它提供了一种类似 MATLAB 的隐式绘图方式,还能在屏幕上打开图形,并充当图形 GUI 管理器。

准备数据

# 准备数据x = np.linspace(02 * np.pi, 100)  # 1维ndarray,包含区间[0,2π)均匀分布的100个点y = np.cos(x)  # x中所有元素对应的余弦值

面向对象风格

# 面向对象风格绘制图形fig, ax = plt.subplots()  # 创建画板Figure对象和子图Axes对象(或子图对象ndarray)ax.plot(x, y, color="green")  # 绘制线图,设置线的颜色为绿色plt.show()  # 显示图形

面向过程风格

# 面向过程风格绘制图形fig = plt.figure()  # 创建Figure对象plt.plot(x, y, color="green")  # 绘制线图,颜色设置为绿色plt.show()  # 显示图形

plt.subplots()详解

plt.subplots()函数的函数签名如下图所示:

函数返回一个画板Figure对象和子图Axes对象(包含Axes对象的ndarray)。参数nrows和ncols默认值为1,默认情况下返回一个子图Axes对象;如果nrows或者ncols有一个不为1,那么返回的是Axes对象组成的ndarray。通过设置nrows和ncols可以设置一个画板上可以绘制多少个子图。sharex和sharey分别设置所有的子图是否共享相同的X轴和Y轴的刻度。width_ratios和height_ratios分别设置每个子图在占画板的宽度和高度比例。比如第一个字图width_ratios设置1,第二子图width_ratios设置2,那么第二个字图宽度比第一个多1倍。subplot_kw是一个存储了设置子图的各种关键字参数的字典,其中包含的关键字必须可以传递给Figure.add_subplot()方法的关键字。fig_kw是设置Figure对象的一些关键字参数。这些关键字参数也是可以传入到plt.figure()函数中。

fig, axs = plt.subplots(    nrows=2,    ncols=2,  # 创建的Figure对象中绘制了2行2列的字图Axes对象    sharex=True,  # 所有的Axes对象共享相同的X轴刻度    sharey="col",  # 只有同列的Axes对象才共享相同的Y轴刻度    width_ratios=[12],  # 第2列的子图宽度是第一列的2倍    height_ratios=[21],  # 第1行的子图高度是第2行的2倍    subplot_kw={  # 会设置所有子图,如果所有子图的设置一致可以在这里统一设置        "title""plot",  # 所有子图的标题设置为plot,子图的标题一般不同,仅作演示        "xlabel""x",  # 所有子图的X轴标签设置x        "ylabel""y",  # 所有子图的Y轴标签设置为y        "alpha"0.1,  # 所有字图中透明度设置为0.1        # "frameon": False, #所有子图的边框取消    },    figsize=(85),  # 设置画板大小,默认大小6.4,4.8    dpi=300,  # 设置图形分辨率为300,默认100    facecolor="#6cc6f3",  # 设置背景颜色,默认值是white    edgecolor="red",  # Figure边框线颜色设置为红色,需要设置线宽才能显示出来    linewidth=1,  # Figure边框线宽度    # frameon=False, # 禁止绘制图形框架,背景色图像边框都没有了,默认为True)axs[00].plot(x, y)  # 绘制第一行第一列的子图axs[01].plot(x, x)  # 绘制第一行第2列的字图plt.show()

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  1. CONNECT:[ UseTime:0.000622s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000803s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000402s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000298s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000483s ]
  6. SELECT * FROM `set` [ RunTime:0.000191s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000545s ]
  8. SELECT * FROM `article` WHERE `id` = 491926 LIMIT 1 [ RunTime:0.000598s ]
  9. UPDATE `article` SET `lasttime` = 1780257388 WHERE `id` = 491926 [ RunTime:0.001601s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000246s ]
  11. SELECT * FROM `article` WHERE `id` < 491926 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000413s ]
  12. SELECT * FROM `article` WHERE `id` > 491926 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000457s ]
  13. SELECT * FROM `article` WHERE `id` < 491926 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001168s ]
  14. SELECT * FROM `article` WHERE `id` < 491926 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000668s ]
  15. SELECT * FROM `article` WHERE `id` < 491926 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001126s ]
0.080747s