python机器学习使数据更鲜活的可视化工具Pandas_Alive

数据动画可视化制作在日常工作中是非常实用的一项技能。目前支持动画可视化的库主要以Matplotlib-Animation为主，其特点为：配置复杂，保存动图容易报错。

安装方法

pip install pandas_alive  # 或者
conda install pandas_alive -c conda-forge

使用说明

pandas_alive 的设计灵感来自 bar_chart_race，为方便快速进行动画可视化制作，在数据的格式上需要满足如下条件：

• 每行表示单个时间段

• 每列包含特定类别的值

• 索引包含时间组件（可选）

支持示例展示

水平条形图

import pandas_alive
covid_df = pandas_alive.load_dataset()
covid_df.plot_animated(filename='examples/perpendicular-example.gif',perpendicular_bar_func='mean')

垂直条形图比赛

import pandas_alive
covid_df = pandas_alive.load_dataset()
covid_df.plot_animated(filename='examples/example-barv-chart.gif',orientation='v')

条形图

与时间与 x 轴一起显示的折线图类似

import pandas_alive
covid_df = pandas_alive.load_dataset()
covid_df.sum(axis=1).fillna(0).plot_animated(filename='examples/example-bar-chart.gif',kind='bar',
       period_label={'x':0.1,'y':0.9},
       enable_progress_bar=True, steps_per_period=2, interpolate_period=True, period_length=200
)

饼图

import pandas_alive
covid_df = pandas_alive.load_dataset()
covid_df.plot_animated(filename='examples/example-pie-chart.gif',kind="pie",rotatelabels=True,period_label={'x':0,'y':0})

多边形地理空间图

import geopandas
import pandas_alive
import contextily
gdf = geopandas.read_file('data/italy-covid-region.gpkg')
gdf.index = gdf.region
gdf = gdf.drop('region',axis=1)
map_chart = gdf.plot_animated(filename='examples/example-geo-polygon-chart.gif',basemap_format={'source':contextily.providers.Stamen.Terrain})

多个图表

pandas_alive 支持单个可视化中的多个动画图表。

示例1

import pandas_alive
urban_df = pandas_alive.load_dataset("urban_pop")
animated_line_chart = (
   urban_df.sum(axis=1)
   .pct_change()
   .fillna(method='bfill')
   .mul(100)
   .plot_animated(kind="line", title="Total ％ Change in Population",period_label=False,add_legend=False)
)
animated_bar_chart = urban_df.plot_animated(n_visible=10,title='Top 10 Populous Countries',period_fmt="％Y")
pandas_alive.animate_multiple_plots('examples/example-bar-and-line-urban-chart.gif',[animated_bar_chart,animated_line_chart],
   title='Urban Population 1977 - 2018', adjust_subplot_top=0.85, enable_progress_bar=True)

示例2

import pandas_alive
covid_df = pandas_alive.load_dataset()
animated_line_chart = covid_df.diff().fillna(0).plot_animated(kind='line',period_label=False,add_legend=False)
animated_bar_chart = covid_df.plot_animated(n_visible=10)
pandas_alive.animate_multiple_plots('examples/example-bar-and-line-chart.gif',[animated_bar_chart,animated_line_chart],
   enable_progress_bar=True)

示例3

import pandas_alive
import pandas as pd
data_raw = pd.read_csv(
   "https://raw.githubusercontent.com/owid/owid-datasets/master/datasets/Long％20run％20life％20expectancy％20-％20Gapminder％2C％20UN/Long％20run％20life％20expectancy％20-％20Gapminder％2C％20UN.csv"
)
list_G7 = [
   "Canada",
   "France",
   "Germany",
   "Italy",
   "Japan",
   "United Kingdom",
   "United States",
]
data_raw = data_raw.pivot(
   index="Year", columns="Entity", values="Life expectancy (Gapminder, UN)"
)
data = pd.DataFrame()
data["Year"] = data_raw.reset_index()["Year"]
for country in list_G7:
   data[country] = data_raw[country].values
data = data.fillna(method="pad")
data = data.fillna(0)
data = data.set_index("Year").loc[1900:].reset_index()
data["Year"] = pd.to_datetime(data.reset_index()["Year"].astype(str))
data = data.set_index("Year")
animated_bar_chart = data.plot_animated(
   period_fmt="％Y",perpendicular_bar_func="mean", period_length=200,fixed_max=True
)
animated_line_chart = data.plot_animated(
   kind="line", period_fmt="％Y", period_length=200,fixed_max=True
)
pandas_alive.animate_multiple_plots(
   "examples/life-expectancy.gif",
   plots=[animated_bar_chart, animated_line_chart],
   title="Life expectancy in G7 countries up to 2015",
   adjust_subplot_left=0.2, adjust_subplot_top=0.9, enable_progress_bar=True
)

示例4

import geopandas
import pandas as pd
import pandas_alive
import contextily
import matplotlib.pyplot as plt
import urllib.request, json
with urllib.request.urlopen(
   "https://data.nsw.gov.au/data/api/3/action/package_show?id=aefcde60-3b0c-4bc0-9af1-6fe652944ec2"
) as url:
   data = json.loads(url.read().decode())
# Extract url to csv component
covid_nsw_data_url = data["result"]["resources"][0]["url"]
# Read csv from data API url
nsw_covid = pd.read_csv(covid_nsw_data_url)
postcode_dataset = pd.read_csv("data/postcode-data.csv")
# Prepare data from NSW health dataset
nsw_covid = nsw_covid.fillna(9999)
nsw_covid["postcode"] = nsw_covid["postcode"].astype(int)
grouped_df = nsw_covid.groupby(["notification_date", "postcode"]).size()
grouped_df = pd.DataFrame(grouped_df).unstack()
grouped_df.columns = grouped_df.columns.droplevel().astype(str)
grouped_df = grouped_df.fillna(0)
grouped_df.index = pd.to_datetime(grouped_df.index)
cases_df = grouped_df
# Clean data in postcode dataset prior to matching
grouped_df = grouped_df.T
postcode_dataset = postcode_dataset[postcode_dataset['Longitude'].notna()]
postcode_dataset = postcode_dataset[postcode_dataset['Longitude'] != 0]
postcode_dataset = postcode_dataset[postcode_dataset['Latitude'].notna()]
postcode_dataset = postcode_dataset[postcode_dataset['Latitude'] != 0]
postcode_dataset['Postcode'] = postcode_dataset['Postcode'].astype(str)

# Build GeoDataFrame from Lat Long dataset and make map chart
grouped_df['Longitude'] = grouped_df.index.map(postcode_dataset.set_index('Postcode')['Longitude'].to_dict())
grouped_df['Latitude'] = grouped_df.index.map(postcode_dataset.set_index('Postcode')['Latitude'].to_dict())
gdf = geopandas.GeoDataFrame(
   grouped_df, geometry=geopandas.points_from_xy(grouped_df.Longitude, grouped_df.Latitude),crs="EPSG:4326")
gdf = gdf.dropna()

# Prepare GeoDataFrame for writing to geopackage
gdf = gdf.drop(['Longitude','Latitude'],axis=1)
gdf.columns = gdf.columns.astype(str)
gdf['postcode'] = gdf.index
gdf.to_file("data/nsw-covid19-cases-by-postcode.gpkg", layer='nsw-postcode-covid', driver="GPKG")

# Prepare GeoDataFrame for plotting
gdf.index = gdf.postcode
gdf = gdf.drop('postcode',axis=1)
gdf = gdf.to_crs("EPSG:3857") #Web Mercator

map_chart = gdf.plot_animated(basemap_format={'source':contextily.providers.Stamen.Terrain},cmap='cool')
cases_df.to_csv('data/nsw-covid-cases-by-postcode.csv')

from datetime import datetime

bar_chart = cases_df.sum(axis=1).plot_animated(
   kind='line',
   label_events={
       'Ruby Princess Disembark':datetime.strptime("19/03/2020", "％d/％m/％Y"),
       'Lockdown':datetime.strptime("31/03/2020", "％d/％m/％Y")
   },
   fill_under_line_color="blue",
   add_legend=False
)

map_chart.ax.set_title('Cases by Location')
grouped_df = pd.read_csv('data/nsw-covid-cases-by-postcode.csv', index_col=0, parse_dates=[0])
line_chart = (
   grouped_df.sum(axis=1)
   .cumsum()
   .fillna(0)
   .plot_animated(kind="line", period_label=False, title="Cumulative Total Cases", add_legend=False)
)
def current_total(values):
   total = values.sum()
   s = f'Total : {int(total)}'
   return {'x': .85, 'y': .2, 's': s, 'ha': 'right', 'size': 11}
race_chart = grouped_df.cumsum().plot_animated(
   n_visible=5, title="Cases by Postcode", period_label=False,period_summary_func=current_total
)

import time
timestr = time.strftime("％d/％m/％Y")
plots = [bar_chart, line_chart, map_chart, race_chart]
from matplotlib import rcParams
rcParams.update({"figure.autolayout": False})
# make sure figures are `Figure()` instances
figs = plt.Figure()
gs = figs.add_gridspec(2, 3, hspace=0.5)
f3_ax1 = figs.add_subplot(gs[0, :])
f3_ax1.set_title(bar_chart.title)
bar_chart.ax = f3_ax1

f3_ax2 = figs.add_subplot(gs[1, 0])
f3_ax2.set_title(line_chart.title)
line_chart.ax = f3_ax2
f3_ax3 = figs.add_subplot(gs[1, 1])
f3_ax3.set_title(map_chart.title)
map_chart.ax = f3_ax3
f3_ax4 = figs.add_subplot(gs[1, 2])
f3_ax4.set_title(race_chart.title)
race_chart.ax = f3_ax4
timestr = cases_df.index.max().strftime("％d/％m/％Y")
figs.suptitle(f"NSW COVID-19 Confirmed Cases up to {timestr}")
pandas_alive.animate_multiple_plots(
   'examples/nsw-covid.gif',
   plots,
   figs,
   enable_progress_bar=True
)

来源：https://blog.csdn.net/weixin_38037405/article/details/109426609