51学通信论坛2017新版
标题:
读取CSV内容并用matplotlib做可视化
[打印本页]
作者:
admin
时间:
2019-6-29 20:17
标题:
读取CSV内容并用matplotlib做可视化
读取CSV内容并用matplotlib做可视化:360行、24列的CSV数据,读取其中的360行,和3列(日期、最高温、最低温),然后可视化输出。
源码和文件:
[attach]5809[/attach]
[attach]5810[/attach]
import csv
from datetime import datetime
from matplotlib import pyplot as plt
# Get dates, high, and low temperatures from file.
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)
# Plot data.
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)
# Format plot.
title = "Daily high and low temperatures - 2014\nDeath Valley, CA"
plt.title(title, fontsize=20)
plt.xlabel('', fontsize=16)
fig.autofmt_xdate()
plt.ylabel("Temperature (F)", fontsize=16)
plt.tick_params(axis='both', which='major', labelsize=16)
plt.show()
复制代码
执行结果:
[attach]5811[/attach]
欢迎光临 51学通信论坛2017新版 (http://bbs.51xuetongxin.com/)
Powered by Discuz! X3