qq_41750817
pikefreeman
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2018-11-17 07:49 阅读 7.1k

用matplotlib设置横坐标为日期时出现问题

在学习《python从入门到实践》第16章时画气温图时出现如下问题
如图图片说明
代码如下:
import csv
from datetime import datetime
import matplotlib.dates as mdates

from matplotlib import pyplot as plt

从文件中获取最高气温

filename = 'death_valley_2014.csv'
with open(filename) as f:
reader = csv.reader(f)
header_row = next(reader)
dates, highs, lows = [], [], []
for row in reader:
try:
current_date = datetime.strptime(row[0], "%Y-%m-%d")
high = int(row[1])
low = int(row[3])
except ValueError:
print(current_date, 'missing data')
else:
dates.append(current_date)
highs.append(high)
lows.append(low)

根据数据绘制图形

fig = plt.figure(dpi=128, figsize=(10, 6))
plt.plot(dates, highs, c='red', alpha=0.5)
plt.plot(dates, lows, c='blue', alpha=0.5)
plt.fill_between(dates, highs, lows, facecolor='blue', alpha=0.1)

设置图形的格式

plt.title("Daily high and low temperatures - 2014\nDeath Valley", fontsize=24)
plt.xlabel('', fontsize=20)
plt.gca().xaxis.set_major_formatter(mdates.DateFormatter('%Y-%m-%d'))
plt.gca().xaxis.set_major_locator(mdates.DayLocator())
fig.autofmt_xdate()
plt.ylabel("Temperature(F)", fontsize=16)
plt.ylim((10, 120))
plt.tick_params(axis='both', which='major', labelsize=16)

plt.show()

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