Yaxis未正确排序matplotlib

Question

我试图用Python3中的Matplotlib绘制温度与日期的关系图。日期沿x轴按递增顺序排列，但y轴不是从最小到最大。Matplotlib似乎正确地定义了范围，但是y轴并不是从最小的值开始的，并且在图的顶部顺序变得更加不正确，如下所示：y-axis view

我用来绘图的代码如下。数据来自一个有四个键（即：US…）的字典，每个键都有四个列表作为它们的值。第一个包含日期，第二个是最高温度，然后是最低温度，然后是平均温度。在

from matplotlib import pyplot
...
pyplot.figure(figsize = (250, 20))
pyplot.plot(\
station_dict['USW00012839'][0], station_dict['USW00012839'][1], 'b-', \
station_dict['USC00081306'][0], station_dict['USC00081306'][1], 'b-', \
station_dict['USW00092811'][0], station_dict['USW00092811'][1], 'b-', \
station_dict['USC00085667'][0], station_dict['USC00085667'][1], 'b-', \
station_dict['USW00012839'][0], station_dict['USW00012839'][2], 'g-', \
station_dict['USC00081306'][0], station_dict['USC00081306'][2], 'g-', \
station_dict['USW00092811'][0], station_dict['USW00092811'][2], 'g-', \
station_dict['USC00085667'][0], station_dict['USC00085667'][2], 'g-', \
station_dict['USW00012839'][0], station_dict['USW00012839'][3], 'r-', \
station_dict['USC00081306'][0], station_dict['USC00081306'][3], 'r-', \
station_dict['USW00092811'][0], station_dict['USW00092811'][3], 'r-', \
station_dict['USC00085667'][0], station_dict['USC00085667'][3], 'r-' \
)
pyplot.title('Miami Temperature from August 2015 to December 2017\n', \
size = 'x-large', weight = 'bold')
pyplot.ylabel('Temperature (Fahrenheit)', style = 'italic')
pyplot.xlabel('Date', style = 'italic')
pyplot.xticks(rotation = 'vertical')
pyplot.show()

整个情节可以在这里看到：plot

整个脚本可以在这里找到：parseNCEI.py 尽管路径需要编辑到下面文件所在的位置。在

数据来源的文件可以在这里找到：1166240.csv

Answer 1

正如DavidG建议的那样，我检查数据并将y值从字符串转换为整数，这就解决了这个问题。在