---
title: HW6-7
tags: dataframe
---
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# `HW6-7重點小整理：`
+ [PLT 的小教學](https://wizardforcel.gitbooks.io/matplotlib-intro-tut/content/matplotlib/3.html)

**input: 使⽤資料來源：Johns Hopkins CSSE,USA
process: 統計巴⻄的死亡⼈數趨勢圖
output : 死亡⼈數趨勢圖(請參考輸出結果)**

import pandas as pd
import matplotlib.pyplot as plt
from datetime import datetime  # 匯入日期模組
import math                    # 匯入數學模組
import numpy as np             # 匯入資料運算模組

# load dataset
dataset_C= pd.read_csv('https://raw.githubusercontent.com/CSSEGISandData/COVID-19/master/csse_covid_19_data/csse_covid_19_time_series/time_series_covid19_confirmed_global.csv')
dataset_D = pd.read_csv('https://raw.githubusercontent.com/CSSEGISandData/COVID-19/master/csse_covid_19_data/csse_covid_19_time_series/time_series_covid19_deaths_global.csv')

# data pre-processing & analysis
sCountry='Brazil'
df_C=dataset_C[dataset_C['Country/Region']==sCountry]
df_D=dataset_D[dataset_D['Country/Region']==sCountry]
total_D = df_D.iloc[0,len(df_D.columns)-1] # total number of deaths cases
temp=df_C.iloc[0, 4:]
x=df_D.iloc[0, 4:].index   # index of series
y=df_D.iloc[0, 4:].values  # value of series

# data visualization
plt.figure(figsize=(16,12))
plt.plot(x,y,   #x軸為日期，y軸為人數
        color = 'red', label = 'Num. of Confirmed', marker = '.')
plt.title('COVID19 Number of Deaths in '+sCountry, color='black', fontsize=20)
plt.ylabel('Number of Persons', fontsize=15)
plt.xlabel('Date', color='black', fontsize=15)

# optimize x axis
start_date=datetime.strptime('01/22/20', '%m/%d/%y')
end_date=datetime.strptime(df_C.columns[-1], '%m/%d/%y')
delta=end_date-start_date  # 計算從第一天到統計的當天，一共有幾天
nMonth=math.ceil(delta.days/30) # 換算成有幾月
x_tick=[] 
for i in range(nMonth):
    x_tick.append(df_C.columns[4+i*30])  # 準備 x 刻度，每一刻度為一月
xvalues = np.arange(0, nMonth*30, step=30)
xlabels = x_tick
plt.xticks(xvalues, xlabels, rotation=45,size=7,color='blue')

# optimize y axis
y_tick=[]
y_seg_size = total_D / 10
for i in range(10):
    y_tick.append('{0:,.0f}'.format(y_seg_size*(i+1)))
plt.yticks(np.arange(y_seg_size, total_D+1, step=y_seg_size), y_tick ,size=10, color='red') # 十等分
plt.grid()


---

**input: 使⽤資料來源：Johns Hopkins CSSE,USA
process:統計印度的每日新增加死亡人數
output:印度的每日新增加死亡人數趨勢圖(請參考輸出圖型)
(提示:使用series 的 diff()函式)**

import pandas as pd
import matplotlib.pyplot as plt
from datetime import datetime  # 匯入日期模組
import math                    # 匯入數學模組
import numpy as np             # 匯入資料運算模組

# load dataset
dataset_D = pd.read_csv('https://raw.githubusercontent.com/CSSEGISandData/COVID-19/master/csse_covid_19_data/csse_covid_19_time_series/time_series_covid19_deaths_global.csv')
# data pre-processing & analysis
sCountry='India'

df_D=dataset_D[dataset_D['Country/Region']==sCountry]

x=df_D.iloc[0, 5::].index   # index of series
y=df_D.iloc[0, 4::].values  # value of series
#dy=df_D.iloc[0, 5::].values - df_D.iloc[0, 4:-1:].values # value of series
Dy = pd.Series(np.array(y))
Dy = Dy.diff()  # value of series

dy = Dy[1::]
#%%

ytick = np.linspace(max(dy)/9, max(dy), num = 9) #取等分
xtick = np.arange(0, dy.size,30) #每30個取一次(30天)

# data visualization
fig = plt.figure(figsize=(24,12))
ax = fig.add_subplot(1, 1, 1)
plt.plot(x, dy,   #x軸為日期，y軸為人數
        color = 'red', 
        label = 'Daily. of Deaths', 
        marker = '.')
plt.ylim([0, max(dy) * 11 / 10])
ax.grid(which='both')
ax.set_xticks(xtick)
ax.set_yticks(ytick)

ax.tick_params(axis = 'x', colors = 'blue')
ax.tick_params(axis = 'y', colors = 'red')

plt.title('COVID19 Number of Deaths Indcreased Daily in '+sCountry, color='black', fontsize=20)
plt.ylabel('Number of Persons', fontsize=15)
plt.xlabel('Date', fontsize=15)


---
# PLT Settings
+ `PLOT`

    plt.plot(x,   # x軸
             y,   # y軸
             color = 'red', 
             label = 'Num. of Confirmed', 
             marker = '.')

+ `X, Y 軸`

    labelname = 'Number of Persons'
    plt.xlabel(labelname, 
               fontsize = 15,
               color = 'black')

+ 可以對X, Y 軸進行設定`plt.xlabel`, `plt.ylabel`

+ `X Y 軸刻度`

    xvalues = np.arange(0, nMonth*30, step=30)
    xlabels = x_tick
    plt.xticks(xvalues, # X 軸刻度
               xlabels, # X 軸各科度的名字
               rotation = 45, 
               size = 7,
               color = 'blue')

+ 可以對X, Y 軸進行設定`plt.xticks`, `plt.yticks`

+ `Figure Title`

    title = 'title'
    plt.title(title, 
              fontsize = 20,
              color = 'black')

+ `格線`

    plt.grid()

+ `各線條的名稱`

    plt.legend()

+ 用途在於把各條線的`label`顯示出來

        import matplotlib.pyplot as plt

        x = [1,2,3]
        y = [5,7,4]

        x2 = [1,2,3]
        y2 = [10,14,12]

        plt.plot(x, y, label='First Line')
        plt.plot(x2, y2, label='Second Line')

        plt.xlabel('Plot Number')
        plt.ylabel('Important var')
        plt.title('Interesting Graph\nCheck it out')
        plt.legend()
        plt.show()

<img src = https://i.imgur.com/pYCBmrK.png
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