为什么当我使用matplotlib.pyplot时，y轴下方的数字更大？

Question

I read the data from a csv.file using pandas.read_csv(). Since the data file contains multiple records, I only plot data related to the plot.
As the plot below, the top number is smaller than the 79 but the plot put it higher. How could I change parameters to make the plot normal?

1 38.8601776787174

2 67.9876506204439

3 79.6575498473462

4 55.4554563564545

Answer 1

Make sure you're converting from a string, especially if you're reading from a file.

This is the graph I got with a standard plot of floating points:

import matplotlib.pyplot as plt

plt.plot([38.8601776787174 , 67.9876506204439 , 79.6575498473462 , 55.4554563564545])
plt.ylabel('some numbers')
plt.show()

And here it is when only one of the values is a string:

import matplotlib.pyplot as plt

plt.plot([38.8601776787174 , 67.9876506204439 , 79.6575498473462 , str(55.4554563564545)])
plt.ylabel('some numbers')
plt.show()

Make sure to convert to int or float before plotting.