关于python matplotlib x轴日期格式设置

Question

关于matplotlib x轴日期格式设置大家好： python 我正在学习写爬虫程序通过yfinance包获取的股票信息使用matplotlib绘制折线图但是matplotlib绘制的轴的日期格式是例如2021 年 11 月 3 日，不是我想要的 matplotlib 日期格式

希望matplotlib绘制的x轴的日期格式可以改一下改为yyyy-mm-dd格式，希望大家帮帮忙

我的代码：

import yfinance as yf
import matplotlib.pyplot as plt
import pandas as pd
from matplotlib.dates import DateFormatter as mdates
startday = '2021-11-03'
endday = '2021-11-12'
ticker_list = ['2303.TW','2610.TW','2618.TW']
data = pd.DataFrame(columns=ticker_list)
for ticker in ticker_list:
     data[ticker] = yf.download(ticker, startday,endday)['Adj Close'] #Get the closing price of the stock market on that day
ans=data.head()
#Start drawing
data.plot(figsize=(8,12))
plt.legend()
plt.rcParams['font.sans-serif'] = ['Microsoft JhengHei']
plt.rcParams['axes.unicode_minus'] = False
plt.title("Line chart change of 7-day closing price of stock market", fontsize=16)
plt.ylabel('closing price', fontsize=14)
plt.xlabel('Day', fontsize=14)
plt.grid(which="major", color='k', linestyle='-.', linewidth=0.5)
plt.show()
print(ans)

Answer 1

您需要定位器和格式化器。参考：https://matplotlib.org/stable/gallery/text_labels_and_annotations/date.html 而且您导入的方式 mdates 不是通常的方式，所以我也进行了调整。

# ... other imports
import matplotlib.dates as mdates
 
startday = '2021-11-03' 
endday = '2021-11-12' 
ticker_list = ['2303.TW','2610.TW','2618.TW'] 
data = pd.DataFrame(columns=ticker_list) 
for ticker in ticker_list: 
    data[ticker] = yf.download(ticker, startday,endday)['Adj Close']
    ans=data.head()  
    data.plot(figsize=(8,12)) 
    plt.legend() 
    plt.rcParams['font.sans-serif'] = ['Microsoft JhengHei'] 
    plt.rcParams['axes.unicode_minus'] = False 
    plt.title("Line chart change of 7-day closing price of stock market", 
              fontsize=16) 
    plt.ylabel('closing price', fontsize=14) 
    plt.xlabel('Day', fontsize=14) 
    plt.grid(which="major", color='k', linestyle='-.', linewidth=0.5) 
    fmt_day = mdates.DayLocator() # provides a list of days 
    plt.gca().xaxis.set_major_locator(fmt_day) 
    plt.gca().xaxis.set_major_formatter(mdates.DateFormatter("%Y-%m-%d")) 
    plt.show()

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