Matplotlib條形圖與兩個Y軸和公共X軸

Question

我想繪製matplotlib條形圖，左邊是一個y軸，右邊是另一個共同的x軸。範圍欄打開x軸。 Perc列位於左側y軸，計數列位於右側y軸。請告知如何繼續。

的樣本數據是在這裏 - SampleFileHere

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


fig = plt.figure() 
ax = td['perc'].plot(kind="bar", alpha=0.7) 
plt.xticks(td['ranges'].tolist()) 
ax2 = ax.twinx() 
ax2.plot(ax.get_xticks(),td['count'],marker='o', c='navy', linewidth=4) 

我得到下面的錯誤。

<ipython-input-24-c1d398c0d012> in <module>() 
     7 fig = plt.figure() 
     8 ax = td['perc'].plot(kind="bar", alpha=0.7) 
----> 9 plt.xticks(td['ranges'].tolist()) 
    10 ax2 = ax.twinx() 
    11 ax2.plot(ax.get_xticks(),td['count'],marker='o', c='navy', linewidth=4) 

Answer 1

您不能將xticks設置爲某些非數字值。相反，您需要將xticklabels設置爲「範圍」列中的條目。

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

counts = np.array([56000,900,5000,6000,30000,3500,300]).astype(float) 
perc = counts/counts.sum() 
df = pd.DataFrame({"range": list("ABCDEFG"),"count":counts, "perc":perc}) 

fig = plt.figure() 
ax = df['perc'].plot(kind="bar", alpha=0.7) 

ax2 = ax.twinx() 
ax2.plot(ax.get_xticks(),df['count'],marker='o', c='navy', linewidth=4) 

ax.set_xticklabels(df['range']) 
ax.set_ylim(0,1.3*df["perc"].max()) 
ax2.set_ylim(0,1.3*df["count"].max()) 
ax2.grid(False) 
plt.show()