在Matplotlib中，如何使x轴图具有日期而不是数字？它的绘图可能使用类似02/2017，03/2017的图形。
这是我的代码：
import matplotlib.pyplot as plt
import datetime as dt
"""this program takes the YTD - daily prices of COST
and calculates and graphs the SMA8 and SMA50"""
""" calulates the SMA"""
def get_sma(prices, nday): # calulates the SMA
sma_data = [0] * len(prices)
for i in range(nday, len(prices)):
sma_data[i] = sum(prices[i - nday:i]) / nday
return sma_data
"""opens file and prepares two lists of prices and dates"""
def read_data(): # opens file and prepares two lists of prices and dates
global dates2
global prices2
filename = input("Please enter your file: ")
f = open(filename)
all_data = f.read()
all_data_list = all_data.split('\n')
data = [x.split(',') for x in all_data_list[1:] if x != '']
dates2 = [d[0] for d in data]
prices2 = [float(d[5]) for d in data]
"""plots the results
plots the sma8
plots sma50"""
def make_plot(dates, original_prices, sma10_prices, sma50_prices): # plots the results
start = dt.datetime(2017, 1, 1)
end = dt.datetime.now()
plt.figure(figsize=(16, 7))
plt.title('Costco Stock 1 Year Data and SMA')
plt.plot(original_prices, linestyle='--', color='red', linewidth=2.0, label='COST') # plots the results
plt.plot(sma10_prices, color='green', linestyle='-.', linewidth=3.0, label='SMA30') # plots sma 8
plt.plot(sma50_prices, 'bo', markersize=1.2, label='SMA50') # plots sma 50
plt.ylim(150, 250)
plt.legend(loc='upper left')
plt.savefig('costco.png')
plt.show()
"""calls the functions
calls func 2
calls func 1 with ndays 8
call func 1 with ndays 50
calls func 3 for plotting"""
def main(): # calls the functions
read_data() # calls func 2
sma10 = get_sma(prices2, 10) # calls func 1 with ndays 8
sma50 = get_sma(prices2, 50) #call func 1 with ndays 50
make_plot(dates2, prices2, sma10, sma50) # calls func 3 for plotting
main()