使用 matplotlib 和 CSV 文件中的数据制作条形图

Question

As it have been written in the title,i do not have an idea how to make a bar chart with data from CSV file because i am just started to programming in Python.

My CSV file looks like this:

CSV

Answer 1

You can use pandas to read your csv file, then matplotlib to plot the bar chart. As an example:

import pandas as pd
import matplotlib.pyplot as plt

filename = <path/to/your/csv/file>
df = pd.read_csv(filename, sep=',', header=0)

fig = plt.figure()

x = df['Characters']
y = df['Number of occurrences']

width = 1.0

plt.bar(x, y, width, color='b' )
plt.show()

Answer 2

import csv
import matplotlib.pyplot as plt
import numpy as np

keys = []
data = []
with open('csv_file.csv') as csv_file:
    csv_reader = csv.reader(csv_file, delimiter=',')
    line_count = 0
    for row in csv_reader:
        keys.append(row[0])
        data.append(row[1])

x_idx = np.arange(len(keys))
plt.bar(x_idx, data, align='center', alpha=0.5)
plt.xticks(x_idx, keys)
plt.ylabel('Data')
plt.title('Your title')
plt.show()