实例1：温度转换

#TempConvert.py
TempStr = input("请输入带有符号的温度值: ")
if TempStr[-1] in ['F', 'f']:C = (eval(TempStr[0:-1]) - 32)/1.8print("转换后的温度是{:.2f}C".format(C))
elif TempStr[-1] in ['C', 'c']:F = 1.8*eval(TempStr[0:-1]) + 32print("转换后的温度是{:.2f}F".format(F))
else:print("输入格式错误")

本实例所涉及函数：

函数	解释	备注
input()	从控制台获得用户输入的函数
print()	以字符形式向控制台输出结果的函数
eval()	去掉参数最外侧引号并执行余下语句的函数	了解更多

实例2：Python蟒蛇绘制

#PythonDraw.py
import turtle
turtle.setup(650, 350, 200, 200)
turtle.penup()
turtle.fd(-250)
turtle.pendown()
turtle.pensize(25)
turtle.pencolor("purple")
turtle.seth(-40)
for i in range(4):turtle.circle(40, 80)turtle.circle(-40, 80)
turtle.circle(40, 80/2)
turtle.fd(40)
turtle.circle(16, 180)
turtle.fd(40 * 2/3)
turtle.done()

本实例所涉及python库：turtle：海龟绘图体系

实例3：天天向上的力量

#DayDayUpQ1.py
dayup = pow(1.001, 365)
daydown = pow(0.999, 365)
print("向上：{:.2f}，向下：{:.2f}".format(dayup, daydown))

#DayDayUpQ2.py
dayfactor = 0.019
dayup = pow(1+dayfactor, 365)
daydown = pow(1-dayfactor, 365)
print("向上：{:.2f}，向下：{:.2f}".format(dayup, daydown))

#DayDayUpQ3.py
dayup = 1.0
dayfactor = 0.01
for i in range(365):if i % 7 in [6,0]:dayup = dayup*(1-dayfactor)else:dayup = dayup*(1+dayfactor)
print("工作日的力量：{:.2f} ".format(dayup))

#DayDayUpQ4.py
def dayUP(df):dayup = 1for i in range(365):if i % 7 in [6,0]:dayup = dayup*(1 - 0.01)else:dayup = dayup*(1 + df)return dayup
dayfactor = 0.01
while dayUP(dayfactor)<37.78:dayfactor += 0.001
print("工作日的努力参数是：{:.3f} ".format(dayfactor))

实例4：文本进度条

#TextProBarV1.py
import time
scale = 10
print("------执行开始------")
for i in range(scale+1):a = '*' * ib = '.' * (scale - i)c = (i/scale)*100print("{:^3.0f}%[{}->{}]".format(c,a,b))time.sleep(0.1)
print("------执行结束------")

#TextProBarV2.py
import time
for i in range(101):print("\r{:3}%".format(i), end="")time.sleep(0.1)

#TextProBarV3.py
import time
scale = 50
print("执行开始".center(scale//2,'-'))
start = time.perf_counter()
for i in range(scale+1):a = '*' * ib = '.' * (scale - i)c = (i/scale)*100dur = time.perf_counter() - startprint("\r{:^3.0f}%[{}->{}]{:.2f}s".format(c,a,b,dur),end='')time.sleep(0.1)
print("\n"+"执行结束".center(scale//2,'-'))

实例5：身体质量指数BMI

#CalBMIv1.py
height, weight = eval(input("请输入身高(米)和体重(公斤)[逗号隔开]: "))
bmi = weight / pow(height, 2)
print("BMI 数值为：{:.2f}".format(bmi))
who = ""
if bmi < 18.5:who = "偏瘦"
elif 18.5 <= bmi < 25:who = "正常"
elif 25 <= bmi < 30:who = "偏胖"
else:who = "肥胖"
print("BMI 指标为:国际'{0}'".format(who))

#CalBMIv2.py
height, weight = eval(input("请输入身高(米)和体重(公斤)[逗号隔开]: "))
bmi = weight / pow(height, 2)
print("BMI 数值为：{:.2f}".format(bmi))
nat = ""
if bmi < 18.5:nat = "偏瘦"
elif 18.5 <= bmi < 24:nat = "正常"
elif 24 <= bmi < 28:nat = "偏胖"
else:nat = "肥胖"
print("BMI 指标为:国内'{0}'".format(nat))

#CalBMIv3.py
height, weight = eval(input("请输入身高(米)和体重(公斤)[逗号隔开]: "))
bmi = weight / pow(height, 2)
print("BMI 数值为：{:.2f}".format(bmi))
who, nat = "", ""
if bmi < 18.5:who, nat = "偏瘦", "偏瘦"
elif 18.5 <= bmi < 24:who, nat = "正常", "正常"
elif 24 <= bmi < 25:who, nat = "正常", "偏胖"
elif 25 <= bmi < 28:who, nat = "偏胖", "偏胖"
elif 28 <= bmi < 30:who, nat = "偏胖", "肥胖"
else:who, nat = "肥胖", "肥胖"
print("BMI 指标为:国际'{0}', 国内'{1}'".format(who, nat))

实例6：圆周率的计算

#CalPiV1.py
pi = 0
N = 100
for k in range(N):pi += 1/pow(16,k)*( \4/(8*k+1) - 2/(8*k+4) - \1/(8*k+5) - 1/(8*k+6) )
print("圆周率值是: {}".format(pi))

#CalPiV2.py
from random import random
from time import perf_counter
DARTS = 1000*1000
hits = 0.0
start = perf_counter()
for i in range(1, DARTS+1):x, y = random(), random()dist = pow(x ** 2 + y ** 2, 0.5)if dist <= 1.0:hits = hits + 1
pi = 4 * (hits/DARTS)
print("圆周率值是: {}".format(pi))
print("运行时间是: {:.5f}s".format(perf_counter() - start))

实例7：七段数码管绘制

#SevenDigitsDrawV1.py
import turtle
def drawLine(draw):   #绘制单段数码管turtle.pendown() if draw else turtle.penup()turtle.fd(40)turtle.right(90)
def drawDigit(digit): #根据数字绘制七段数码管drawLine(True) if digit in [2,3,4,5,6,8,9] else drawLine(False)drawLine(True) if digit in [0,1,3,4,5,6,7,8,9] else drawLine(False)drawLine(True) if digit in [0,2,3,5,6,8,9] else drawLine(False)drawLine(True) if digit in [0,2,6,8] else drawLine(False)turtle.left(90)drawLine(True) if digit in [0,4,5,6,8,9] else drawLine(False)drawLine(True) if digit in [0,2,3,5,6,7,8,9] else drawLine(False)drawLine(True) if digit in [0,1,2,3,4,7,8,9] else drawLine(False)turtle.left(180)turtle.penup()turtle.fd(20)
def drawDate(date):  #获得要输出的数字for i in date:drawDigit(eval(i))  #通过eval()函数将数字变为整数
def main():turtle.setup(800, 350, 200, 200)turtle.penup()turtle.fd(-300)turtle.pensize(5)drawDate('20181010')turtle.hideturtle()turtle.done()
main()

#SevenDigitsDrawV2.py
import turtle, time
def drawGap(): #绘制数码管间隔turtle.penup()turtle.fd(5)
def drawLine(draw):   #绘制单段数码管drawGap()turtle.pendown() if draw else turtle.penup()turtle.fd(40)drawGap()turtle.right(90)
def drawDigit(d): #根据数字绘制七段数码管drawLine(True) if d in [2,3,4,5,6,8,9] else drawLine(False)drawLine(True) if d in [0,1,3,4,5,6,7,8,9] else drawLine(False)drawLine(True) if d in [0,2,3,5,6,8,9] else drawLine(False)drawLine(True) if d in [0,2,6,8] else drawLine(False)turtle.left(90)drawLine(True) if d in [0,4,5,6,8,9] else drawLine(False)drawLine(True) if d in [0,2,3,5,6,7,8,9] else drawLine(False)drawLine(True) if d in [0,1,2,3,4,7,8,9] else drawLine(False)turtle.left(180)turtle.penup()turtle.fd(20)
def drawDate(date):turtle.pencolor("red")for i in date:if i == '-':turtle.write('年',font=("Arial", 18, "normal"))turtle.pencolor("green")turtle.fd(40)elif i == '=':turtle.write('月',font=("Arial", 18, "normal"))turtle.pencolor("blue")turtle.fd(40)elif i == '+':turtle.write('日',font=("Arial", 18, "normal"))else:drawDigit(eval(i))
def main():turtle.setup(800, 350, 200, 200)turtle.penup()turtle.fd(-350)turtle.pensize(5)
#    drawDate('2018-10=10+')drawDate(time.strftime('%Y-%m=%d+',time.gmtime()))turtle.hideturtle()turtle.done()
main()

实例8：科赫雪花小包裹

#KochDrawV1.py
import turtle
def koch(size, n):if n == 0:turtle.fd(size)else:for angle in [0, 60, -120, 60]:turtle.left(angle)koch(size/3, n-1)
def main():turtle.setup(800,400)turtle.penup()turtle.goto(-300, -50)turtle.pendown()turtle.pensize(2)koch(600,3)     # 0阶科赫曲线长度，阶数turtle.hideturtle()
main()

#KochDrawV2.py
import turtle
def koch(size, n):if n == 0:turtle.fd(size)else:for angle in [0, 60, -120, 60]:turtle.left(angle)koch(size/3, n-1)
def main():turtle.setup(600,600)turtle.penup()turtle.goto(-200, 100)turtle.pendown()turtle.pensize(2)level = 3      # 3阶科赫雪花，阶数koch(400,level)     turtle.right(120)koch(400,level)turtle.right(120)koch(400,level)turtle.hideturtle()
main()

实例9：基本统计值计算

#CalStatisticsV1.py
def getNum():       #获取用户不定长度的输入nums = []iNumStr = input("请输入数字(回车退出): ")while iNumStr != "":nums.append(eval(iNumStr))iNumStr = input("请输入数字(回车退出): ")return numsdef mean(numbers):  #计算平均值s = 0.0for num in numbers:s = s + numreturn s / len(numbers)def dev(numbers, mean): #计算方差sdev = 0.0for num in numbers:sdev = sdev + (num - mean)**2return pow(sdev / (len(numbers)-1), 0.5)def median(numbers):    #计算中位数sorted(numbers)size = len(numbers)if size % 2 == 0:med = (numbers[size//2-1] + numbers[size//2])/2else:med = numbers[size//2]return medn =  getNum() #主体函数
m =  mean(n)
print("平均值:{},方差:{:.2},中位数:{}.".format(m, dev(n,m),median(n)))

实例10：文本词频统计

#CalHamletV1.py
def getText():txt = open("hamlet.txt", "r").read()txt = txt.lower()for ch in '!"#$%&()*+,-./:;<=>?@[\\]^_‘{|}~':txt = txt.replace(ch, " ")   #将文本中特殊字符替换为空格return txthamletTxt = getText()
words  = hamletTxt.split()
counts = {}
for word in words:          counts[word] = counts.get(word,0) + 1
items = list(counts.items())
items.sort(key=lambda x:x[1], reverse=True)
for i in range(10):word, count = items[i]print ("{0:<10}{1:>5}".format(word, count))

#CalThreeKingdomsV1.py
import jieba
txt = open("threekingdoms.txt", "r", encoding='utf-8').read()
words  = jieba.lcut(txt)
counts = {}
for word in words:if len(word) == 1:continueelse:counts[word] = counts.get(word,0) + 1
items = list(counts.items())
items.sort(key=lambda x:x[1], reverse=True)
for i in range(15):word, count = items[i]print ("{0:<10}{1:>5}".format(word, count))

#CalThreeKingdomsV2.py
import jieba
excludes = {"将军","却说","荆州","二人","不可","不能","如此","商议","如何",\"主公","军士","左右","军马","引兵","次日","大喜","天下","东吴",\"于是","今日","不敢","魏兵","陛下","一人","都督","人马","不知",\"汉中","只见","众将","后主","蜀兵","上马","大叫","太守","此人",\"夫人","先主","后人","背后","城中","天子","一面","何不","大军",\"忽报","先生","百姓","何故","然后","先锋","不如","赶来"}
txt = open("threekingdoms.txt", "r", encoding='utf-8').read()
words  = jieba.lcut(txt)
counts = {}
for word in words:if len(word) == 1:continueelif word == "诸葛亮" or word == "孔明曰":rword = "孔明"elif word == "关公" or word == "云长":rword = "关羽"elif word == "玄德" or word == "玄德曰":rword = "刘备"elif word == "孟德" or word == "丞相":rword = "曹操"else:rword = wordcounts[rword] = counts.get(rword,0) + 1
for word in excludes:del counts[word]
items = list(counts.items())
items.sort(key=lambda x:x[1], reverse=True)
for i in range(15):word, count = items[i]print ("{0:<10}{1:>5}".format(word, count))

实例11：自动轨迹绘制

#AutoTraceDraw.py
import turtle as t
t.title('自动轨迹绘制')
t.setup(800, 600, 0, 0)
t.pencolor("red")
t.pensize(5)
#数据读取
datals = []
f = open("data.txt")
for line in f:line = line.replace("\n","")datals.append(list(map(eval, line.split(","))))
f.close()
#自动绘制
for i in range(len(datals)):t.pencolor(datals[i][3],datals[i][4],datals[i][5])t.fd(datals[i][0])if datals[i][1]:t.rt(datals[i][2])else:t.lt(datals[i][2])

其中文件 data.txt 如下：

300,0,144,1,0,0
300,0,144,0,1,0
300,0,144,0,0,1
300,0,144,1,1,0
300,0,108,0,1,1
184,0,72,1,0,1
184,0,72,0,0,0
184,0,72,0,0,0
184,0,72,0,0,0
184,1,72,1,0,1
184,1,72,0,0,0
184,1,72,0,0,0
184,1,72,0,0,0
184,1,72,0,0,0
184,1,720,0,0,0

实例12：政府工作报告词云

#GovRptWordCloudv1.py
import jieba
import wordcloud
f = open("新时代中国特色社会主义.txt", "r", encoding="utf-8")t = f.read()
f.close()
ls = jieba.lcut(t)txt = " ".join(ls)
w = wordcloud.WordCloud( \width = 1000, height = 700,\background_color = "white",font_path = "msyh.ttc"    )
w.generate(txt)
w.to_file("grwordcloud.png")

#GovRptWordCloudv1.py
import jieba
import wordcloud
f = open("关于实施乡村振兴战略的意见.txt", "r", encoding="utf-8")t = f.read()
f.close()
ls = jieba.lcut(t)txt = " ".join(ls)
w = wordcloud.WordCloud( \width = 1000, height = 700,\background_color = "white",font_path = "msyh.ttc"    )
w.generate(txt)
w.to_file("grwordcloud.png")

#GovRptWordCloudv1.py
import jieba
import wordcloud
f = open("新时代中国特色社会主义.txt", "r", encoding="utf-8")t = f.read()
f.close()
ls = jieba.lcut(t)txt = " ".join(ls)
w = wordcloud.WordCloud( \width = 1000, height = 700,\background_color = "white",font_path = "msyh.ttc", max_words = 15)
w.generate(txt)
w.to_file("grwordcloud.png")

#GovRptWordCloudv1.py
import jieba
import wordcloud
f = open("关于实施乡村振兴战略的意见.txt", "r", encoding="utf-8")t = f.read()
f.close()
ls = jieba.lcut(t)txt = " ".join(ls)
w = wordcloud.WordCloud( \width = 1000, height = 700,\background_color = "white",font_path = "msyh.ttc",max_words = 15)
w.generate(txt)
w.to_file("grwordcloud.png")

#GovRptWordCloudv2.py
import jieba
import wordcloud
from scipy.misc import imread
mask = imread("fivestart.png")
excludes = { }
f = open("新时代中国特色社会主义.txt", "r", encoding="utf-8")
t = f.read()
f.close()
ls = jieba.lcut(t)
txt = " ".join(ls)
w = wordcloud.WordCloud(\width = 1000, height = 700,\background_color = "white",font_path = "msyh.ttc", mask = mask)
w.generate(txt)
w.to_file("grwordcloudm.png")

#GovRptWordCloudv2.py
import jieba
import wordcloud
from scipy.misc import imread
mask = imread("chinamap.jpg")
excludes = { }
f = open("新时代中国特色社会主义.txt", "r", encoding="utf-8")
t = f.read()
f.close()
ls = jieba.lcut(t)
txt = " ".join(ls)
w = wordcloud.WordCloud(\width = 1000, height = 700,\background_color = "white",font_path = "msyh.ttc", mask = mask)
w.generate(txt)
w.to_file("grwordcloudm.png")

#GovRptWordCloudv2.py
import jieba
import wordcloud
from scipy.misc import imread
mask = imread("chinamap.jpg")
excludes = { }
f = open("关于实施乡村振兴战略的意见.txt", "r", encoding="utf-8")
t = f.read()
f.close()
ls = jieba.lcut(t)
txt = " ".join(ls)
w = wordcloud.WordCloud(\width = 1000, height = 700,\background_color = "white",font_path = "msyh.ttc", mask = mask)
w.generate(txt)
w.to_file("grwordcloudm.png")

实例13：体育竞技分析

#MatchAnalysis.py
from random import random
def printIntro():print("这个程序模拟两个选手A和B的某种竞技比赛")print("程序运行需要A和B的能力值（以0到1之间的小数表示）")
def getInputs():a = eval(input("请输入选手A的能力值(0-1): "))b = eval(input("请输入选手B的能力值(0-1): "))n = eval(input("模拟比赛的场次: "))return a, b, n
def simNGames(n, probA, probB):winsA, winsB = 0, 0for i in range(n):scoreA, scoreB = simOneGame(probA, probB)if scoreA > scoreB:winsA += 1else:winsB += 1return winsA, winsB
def gameOver(a,b):return a==15 or b==15
def simOneGame(probA, probB):scoreA, scoreB = 0, 0serving = "A"while not gameOver(scoreA, scoreB):if serving == "A":if random() < probA:scoreA += 1else:serving="B"else:if random() < probB:scoreB += 1else:serving="A"return scoreA, scoreB
def printSummary(winsA, winsB):n = winsA + winsBprint("竞技分析开始，共模拟{}场比赛".format(n))print("选手A获胜{}场比赛，占比{:0.1%}".format(winsA, winsA/n))print("选手B获胜{}场比赛，占比{:0.1%}".format(winsB, winsB/n))
def main():printIntro()probA, probB, n = getInputs()winsA, winsB = simNGames(n, probA, probB)printSummary(winsA, winsB)
main()

实例14：第三方库安装脚本

#BatchInstall.py
import os
libs = {"numpy","matplotlib","pillow","sklearn","requests",\"jieba","beautifulsoup4","wheel","networkx","sympy",\"pyinstaller","django","flask","werobot","pyqt5",\"pandas","pyopengl","pypdf2","docopt","pygame"}
try:for lib in libs:os.system("pip3 install "+lib)print("Successful")
except:print("Failed Somehow")

实例15：霍兰德人格分析雷达图

#HollandRadarDraw
import numpy as np
import matplotlib.pyplot as plt
import matplotlib
matplotlib.rcParams['font.family']='SimHei'
radar_labels = np.array(['研究型(I)','艺术型(A)','社会型(S)',\'企业型(E)','常规型(C)','现实型(R)']) #雷达标签
nAttr = 6
data = np.array([[0.40, 0.32, 0.35, 0.30, 0.30, 0.88],[0.85, 0.35, 0.30, 0.40, 0.40, 0.30],[0.43, 0.89, 0.30, 0.28, 0.22, 0.30],[0.30, 0.25, 0.48, 0.85, 0.45, 0.40],[0.20, 0.38, 0.87, 0.45, 0.32, 0.28],[0.34, 0.31, 0.38, 0.40, 0.92, 0.28]]) #数据值
data_labels = ('艺术家', '实验员', '工程师', '推销员', '社会工作者','记事员')
angles = np.linspace(0, 2*np.pi, nAttr, endpoint=False)
data = np.concatenate((data, [data[0]]))
angles = np.concatenate((angles, [angles[0]]))
fig = plt.figure(facecolor="white")
plt.subplot(111, polar=True)
plt.plot(angles,data,'o-', linewidth=1, alpha=0.2)
plt.fill(angles,data, alpha=0.25)
plt.thetagrids(angles*180/np.pi, radar_labels,frac = 1.2)
plt.figtext(0.52, 0.95, '霍兰德人格分析', ha='center', size=20)
legend = plt.legend(data_labels, loc=(0.94, 0.80), labelspacing=0.1)
plt.setp(legend.get_texts(), fontsize='large')
plt.grid(True)
plt.savefig('holland_radar.jpg')
plt.show()

实例16：玫瑰花绘制

#RoseDraw.py
import turtle as t
# 定义一个曲线绘制函数
def DegreeCurve(n, r, d=1):for i in range(n):t.left(d)t.circle(r, abs(d))
# 初始位置设定
s = 0.2 # size
t.setup(450*5*s, 750*5*s)
t.pencolor("black")
t.fillcolor("red")
t.speed(100)
t.penup()
t.goto(0, 900*s)
t.pendown()
# 绘制花朵形状
t.begin_fill()
t.circle(200*s,30)
DegreeCurve(60, 50*s)
t.circle(200*s,30)
DegreeCurve(4, 100*s)
t.circle(200*s,50)
DegreeCurve(50, 50*s)
t.circle(350*s,65)
DegreeCurve(40, 70*s)
t.circle(150*s,50)
DegreeCurve(20, 50*s, -1)
t.circle(400*s,60)
DegreeCurve(18, 50*s)
t.fd(250*s)
t.right(150)
t.circle(-500*s,12)
t.left(140)
t.circle(550*s,110)
t.left(27)
t.circle(650*s,100)
t.left(130)
t.circle(-300*s,20)
t.right(123)
t.circle(220*s,57)
t.end_fill()
# 绘制花枝形状
t.left(120)
t.fd(280*s)
t.left(115)
t.circle(300*s,33)
t.left(180)
t.circle(-300*s,33)
DegreeCurve(70, 225*s, -1)
t.circle(350*s,104)
t.left(90)
t.circle(200*s,105)
t.circle(-500*s,63)
t.penup()
t.goto(170*s,-30*s)
t.pendown()
t.left(160)
DegreeCurve(20, 2500*s)
DegreeCurve(220, 250*s, -1)
# 绘制一个绿色叶子
t.fillcolor('green')
t.penup()
t.goto(670*s,-180*s)
t.pendown()
t.right(140)
t.begin_fill()
t.circle(300*s,120)
t.left(60)
t.circle(300*s,120)
t.end_fill()
t.penup()
t.goto(180*s,-550*s)
t.pendown()
t.right(85)
t.circle(600*s,40)
# 绘制另一个绿色叶子
t.penup()
t.goto(-150*s,-1000*s)
t.pendown()
t.begin_fill()
t.rt(120)
t.circle(300*s,115)
t.left(75)
t.circle(300*s,100)
t.end_fill()
t.penup()
t.goto(430*s,-1070*s)
t.pendown()
t.right(30)
t.circle(-600*s,35)
t.done()

---

资料来源于：中国大学mooc

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