Matplotlib Tutorials7 load CSV files

Practice 1

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import matplotlib.pyplot as plt
import csv

x = []
y = []

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

plt.plot(x,y,label='loaded from files')

plt.xlabel('x')
plt.ylabel('y')
plt.title('Interesting Graph\nCheck it out')
plt.legend()
plt.show()

在这里插入图片描述

Practice 2

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import matplotlib.pyplot as plt
import numpy as np

#Part 1

'''
x = []
y = []

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

plt.plot(x,y,label='loaded from files')
'''

x,y = np.loadtxt('example.txt',delimiter=',',unpack=True)

plt.plot(x,y,label='loaded from files')

plt.xlabel('x')
plt.ylabel('y')
plt.title('Interesting Graph\nCheck it out')
plt.legend()
plt.show()

在这里插入图片描述