python读取excel数据并且画图的实现示例

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

# 1930workbook=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<arr_len: 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 npimport matplotlib.pyplot as plt # 数据N = 5x = [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 pltx = [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 axesplt.margins(0.2)# Tweak spacing to prevent clipping of tick-labelsplt.subplots_adjust(bottom=0.15)plt.show()

import pandas as pdimport numpy as np import xlrdfrom matplotlib import pyplotdef drawBar(Music_genre,singer_num,year): arr_len=len(Music_genre) i=0 dict_music_singer={} while i<arr_len: 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() # 1930workbook=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) # 1940workbook=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) # 6workbook=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) # 9workbook=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) # 2000workbook=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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