read from txt. file in certain manner

[snippsat]

Example:

import matplotlib.pyplot as plt
plt.style.use('ggplot')
import csv

x = []
y = []
with open('x_y.txt') as csv_file:
    plots = csv.reader(csv_file, delimiter=',')
    for row in plots:
        x.append(int(row[0]))
        y.append(int(row[1]))

plt.plot(x,y, label='Loaded from file!')
plt.xlabel('x')
plt.ylabel('y')
plt.title('Graph x y')
plt.legend(loc='upper left', shadow=True, fontsize='large')
plt.show()

x_y.txt:

Output:
1,5
2,3
3,4
4,7
5,4

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In future also look into Pandas and Jupyter Notebook.
This can make it easier to load and work with data/plot.