Plot multiple csv into one graph problem with visualize

[linkxxx86]

Hi everyone,
I really need an help, I created a small code to read 27 file .csv together and plot in the same graph.
In the csv files there is the time( x-axis) and 2 temperatures(y-axis), I don't understand why I get this kind of terrible graph.

import pandas as pd
from glob import glob
import matplotlib.pyplot as plt
import plotly.graph_objects as go



numFiles = 27 #Number of CSV files in your directory
separator = "," #Character that separates each value inside file
fExtension = ".csv" #Extension of the file storing the data


dataframe = sorted(glob('test*.csv'))


pd.concat((pd.read_csv(file).assign(filename = file)
           for file in dataframe), ignore_index  = True)





plt.plot(list(str(dataframe)) )
plt.show()
 

In this Url link there is the plot

https://ibb.co/dkn3jB1