python入门-python处理csv文件格式相关

python入门-python处理csv文件格式相关

处理 下载的csv格式文件

直接上代码和效果图

import csv
from datetime import datetime
from matplotlib import pyplot as plt

#从文件中获取最高气温和日期和最低气温
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\n Death Vally", fontsize=20)
plt.xlabel("", fontsize=16)
fig.autofmt_xdate()
plt.ylabel("Tempearture(F)", fontsize=16)
plt.tick_params(axis='both', which='major', labelsize=16)

plt.show()