matplotlib之直方图

1、导入包

import matplotlib.pyplot as plt
import numpy as np
import pandas as pd

2、导入文件

california_housing_dataframe = pd.read_csv("https://storage.googleapis.com/mledu-datasets/california_housing_train.csv", sep =",")
california_housing_dataframe = california_housing_dataframe.reindex(np.random.permutation(california_housing_dataframe.index))
california_housing_dataframe["rooms_per_person"] = california_housing_dataframe["total_rooms"] / california_housing_dataframe["population"]

3、可视化

3.1、pandas自带hist

california_housing_dataframe["rooms_per_person"].hist()

3.2、matplotlib的hist

hist（）函数除了绘制直方图外，还以元组形式返回直方图的计算结果。

pop = np.random.randint(0,100,100)
n.bins, patches = plt.hist(pop, bins=20)