一,要读取的数据的格式：

二,数据读取部分：

b站视频参考：https://www.bilibili.com/video/BV14C4y1W7Nj?t=148

# 1930

workbook=xlrd.open_workbook('1930.xlsx')

sheet= workbook.sheet_by_index(0)

A1=[]

B1=[]

# sheet.cell_value(i,0):第i行的第0个元素

for i in range(1,sheet.nrows):

A1.append(sheet.cell_value(i,0))

B1.append(sheet.cell_value(i,1))

if len(A1)!=len(B1):

print("False")

drawBar(A1,B1,1930)

三,画图函数

1. def drawBar(Music_genre,singer_num,year)

参数介绍

参数名

参数含义

Music_genre

音乐流派名称list

singer_num

音乐流派对应音乐家数量list

year

读的文件的年份(因为源代码是从1840到2020的)

def drawBar(Music_genre,singer_num,year):

arr_len=len(Music_genre)

# 由循环得到一个字典，key是音乐流派，value是这个音乐流派对应的音乐家的数量

i=0

dict_music_singer={}

while i

dict_music_singer[Music_genre[i]]=singer_num[i]

i=i+1

# 注释1

pyplot.bar(x=0, bottom=range(arr_len), height=0.3, width=singer_num, orientation="horizontal")

# 注释2

pyplot.yticks(range(arr_len),Music_genre)

# 加title，展示图像

pyplot.title(year)

pyplot.show()

...

...

drawBar(A1,B1,1930)

注释1：

"""

水平条形图，需要修改以下属性

orientation="horizontal"

"""

import numpy as np

import matplotlib.pyplot as plt

# 数据

N = 5

x = [20, 10, 30, 25, 15]

y = [0,1,2,3,4]

# 绘图 x= 起始位置， bottom= 水平条的底部(左侧), y轴， height 水平条的宽度， width 水平条的长度

p1 = plt.bar(x=0, bottom=y, height=0.5, width=x, orientation="horizontal")

pyplot.bar(range(arr_len),singer_num,align='center')

pyplot.bar(x=0, bottom=range(arr_len), height=0.5, width=singer_num, orientation="horizontal")

# 展示图形

plt.show()

注释2：plt.xticks的第一个参数和plt.plot的第一个参数一样，第二个参数是和第一个参数相同长度的list此例中用来代替横坐标

import matplotlib.pyplot as plt

x = [1, 2, 3, 4]

y = [1, 4, 9, 6]

labels = ['Frogs', 'Hogs', 'Bogs', 'Slogs']

plt.plot(x, y)

# You can specify a rotation for the tick labels in degrees or with keywords.

plt.xticks(x, labels, rotation='vertical')

# Pad margins so that markers don't get clipped by the axes

plt.margins(0.2)

# Tweak spacing to prevent clipping of tick-labels

plt.subplots_adjust(bottom=0.15)

plt.show()

1.1 效果：

1.2 完整代码

import pandas as pd

import numpy as np

import xlrd

from matplotlib import pyplot

def drawBar(Music_genre,singer_num,year):

arr_len=len(Music_genre)

i=0

dict_music_singer={}

while i

dict_music_singer[Music_genre[i]]=singer_num[i]

i=i+1

#pyplot.bar(range(arr_len),singer_num,align='center')

pyplot.bar(x=0, bottom=range(arr_len), height=0.3, width=singer_num, orientation="horizontal")

pyplot.yticks(range(arr_len),Music_genre)

pyplot.title(year)

pyplot.show()

# 1930

workbook=xlrd.open_workbook('1930.xlsx')

sheet= workbook.sheet_by_index(0)

A1=[]

B1=[]

for i in range(1,sheet.nrows):

A1.append(sheet.cell_value(i,0))

B1.append(sheet.cell_value(i,1))

if len(A1)!=len(B1):

print("False")

drawBar(A1,B1,1930)

# 1940

workbook=xlrd.open_workbook('1940.xlsx')

sheet= workbook.sheet_by_index(0)

A2=[]

B2=[]

for i in range(1,sheet.nrows):

A2.append(sheet.cell_value(i,0))

B2.append(sheet.cell_value(i,1))

if len(A2)!=len(B2):

print("False")

drawBar(A2,B2,1940)

#

workbook=xlrd.open_workbook('1950.xlsx')

sheet= workbook.sheet_by_index(0)

A3=[]

B3=[]

for i in range(1,sheet.nrows):

A3.append(sheet.cell_value(i,0))

B3.append(sheet.cell_value(i,1))

if len(A3)!=len(B3):

print("False")

drawBar(A3,B3,1950)

# 6

workbook=xlrd.open_workbook('1960.xlsx')

sheet= workbook.sheet_by_index(0)

A4=[]

B4=[]

for i in range(1,sheet.nrows):

A4.append(sheet.cell_value(i,0))

B4.append(sheet.cell_value(i,1))

if len(A4)!=len(B4):

print("False")

drawBar(A4,B4,1960)

#

workbook=xlrd.open_workbook('1970.xlsx')

sheet= workbook.sheet_by_index(0)

A5=[]

B5=[]

for i in range(1,sheet.nrows):

A5.append(sheet.cell_value(i,0))

B5.append(sheet.cell_value(i,1))

if len(A5)!=len(B5):

print("False")

drawBar(A5,B5,1970)

#

workbook=xlrd.open_workbook('1980.xlsx')

sheet= workbook.sheet_by_index(0)

A6=[]

B6=[]

for i in range(1,sheet.nrows):

A6.append(sheet.cell_value(i,0))

B6.append(sheet.cell_value(i,1))

if len(A6)!=len(B6):

print("False")

drawBar(A6,B6,1980)

# 9

workbook=xlrd.open_workbook('1990.xlsx')

sheet= workbook.sheet_by_index(0)

A7=[]

B7=[]

for i in range(1,sheet.nrows):

A7.append(sheet.cell_value(i,0))

B7.append(sheet.cell_value(i,1))

if len(A7)!=len(B7):

print("False")

drawBar(A7,B7,1990)

# 2000

workbook=xlrd.open_workbook('2000.xlsx')

sheet= workbook.sheet_by_index(0)

A8=[]

B8=[]

for i in range(1,sheet.nrows):

A8.append(sheet.cell_value(i,0))

B8.append(sheet.cell_value(i,1))

if len(A8)!=len(B8):

print("False")

drawBar(A8,B8,2000)

#

workbook=xlrd.open_workbook('2010.xlsx')

sheet= workbook.sheet_by_index(0)

A9=[]

B9=[]

for i in range(1,sheet.nrows):

A9.append(sheet.cell_value(i,0))

B9.append(sheet.cell_value(i,1))

if len(A9)!=len(B9):

print("False")

drawBar(A9,B9,2010)

# #

# workbook=xlrd.open_workbook('2020.xlsx')

# sheet= workbook.sheet_by_index(0)

# A2=[]

# B2=[]

# for i in range(1,sheet.nrows):

# A2.append(sheet.cell_value(i,0))

# B2.append(sheet.cell_value(i,1))

# if len(A2)!=len(B2):

# print("False")

# drawBar(A2,B2,2020)

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