温度转换

#获取输入字符串 str1 = input() #判断最后一位 if str1[-1] in ['F','f']: #进行转换     C = (eval(str1[0:-1])-32)/1.8 #格式化输出 print("{:.2f}C".format(C)) elif str1[-1] in['C','c']:     F = eval(str1[0:-1])*1.8+32 print("{:.2f}F".format(F)) else: print("输入格式错误") 

输出HelloWorld

print("Hello World") 

数字形式转换 I

#0 - 》 零 可以建立起 数字到下标的映射 strs = "零一二三四五六七八九" strIn = input() #遍历字符串 for c in strIn: #打印数字对应的字符，并且不做换行处理 print(strs[eval(c)],end="") 

温度转换II

str1 = input() if str1[0] == "F":     C = (eval(str1[1:]) -32) / 1.8 print("C{:.2f}".format(C)) elif str1[0] == "C":     F = eval(str1[1:])* 1.8 +32 print("F{:.2f}".format(F)) 

货币转换

Str1 = input() if Str1[0:3] == "RMB":     U = eval(Str1[3:])/6.78 print("USD{:.2f}".format(U)) elif Str1[0:3] == "USD":     R = eval(Str1[3:])*6.78 print("RMB{:.2f}".format(R)) 

绘制正方形

import turtle as t for i in range(4):     t.fd(200)     t.left(90)  t.done() 

输出六边形

import turtle as t for i in range(6):     t.fd(90)     t.left(60) t.done() 

绘制叠边形

import turtle as t  for i in range(9):     t.fd(90)     t.left(80) t.done() 

风车

import turtle as t def draw():     t.fd(75)     t.right(90)     t.circle(-75,45)     t.right(90)     t.fd(75) angle = 0 for i in range(4):     t.seth(angle)     draw()     angle+=90  t.done() 

天天向上的力量

A = pow(1.01,365) def exceed(fd):     dayup = 1 for i in range(365): if i % 7 in [0,6]:             dayup *= 1-0.01 else:             dayup *= 1+ fd     return dayup  df = 0.01 while exceed(df) < A:     df+=0.001 print("工作日的努力参数是:","{:.3f}".format(df)) 

文本进度条

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

三次方的格式化

number = pow(eval(input()),3) #使用格式化 #print("{:-^20}".format(number)) #使用center函数 print("{}".format(number).center(20,"-")) 

星号三角

number = eval(input()) for i in range((number+1)//2): print("{}".format((i*2+1) * "*").center(number," ")) 

凯撒密码

s = input() t = "" for c in s: #如果这个字符在小写a 和小写z 之间 if 'a' <= c <= 'z': # 用ord 获取这个字符在Uniocde 编码对应的数字，a - z 一定时连续的 #获取到之后计算它与a 字符的差值，就能知道它对应的偏移， #然后在使用计算公式计算它密文的对应偏移，在加上初始值’a‘ 对应的数字 # 最后使用 chr 转换成字符         t += chr(ord("a") + (ord(c)-ord("a")+3)%26 ) elif 'A' <= c <= 'Z':         t += chr(ord("A") + (ord(c)-ord("A")+3)%26 ) else :         t+=c print(t) 

身体质量BMI

hight , weight = eval(input()) bmi = weight / pow(hight,2) who , cha = "","" if bmi < 18.5:     who,cha = "偏瘦","偏瘦" elif 18.5 <= bmi < 24:     who,cha = "正常","正常" elif 24 <= bmi < 28:     who,cha = "偏胖","偏胖" elif 28 <= bmi <= 30 :     who,cha = "偏胖","肥胖" elif 30 < bmi :     who,cha = "肥胖","肥胖" print("BMI数值为:{:.2f}".format(bmi)) print("BMI指标为:国际'{}',国内'{}'".format(who,cha)) 

圆周率的计算

import random random.seed(123) Dart = eval(input()) hit = 0 for i in range (Dart):     x,y = random.random(),random.random() if pow(x**2+y**2 ,0.5) <= 1.0:         hit+=1 pi = 4* (hit/Dart) print("{:.6f}".format(  pi)) 

整数的加减和

res = 0 for i in range(1,967):     res+= i*pow(-1,i+1) print(res) 

三位水仙花数

面向对象思想

def isSXH(n):     temp = n     res = 0 for i in range(3):         res += int(pow(n % 10, 3))         n //= 10 if res == temp: return True return False      res = "" for i in range(100, 1000): if isSXH(i):         res = res + "{},".format(i) print(res[:-1]) 

使用列表：

ls=[] for i in range(100,1000):  a = i //100  b = i//10%10  c = i%100 %10  d = a**3 + b**3 + c**3 if d == i:   ls.append(i) res = '' for n in ls: #转换为字符串进行拼接  res += str(n)+"," print(res[:-1]) 

使用字符下标：

res = "" for i in range(100,1000): #先转为字符串  t = str(i) if pow(eval(t[0]),3)+pow(eval(t[1]),3)+pow(eval(t[2]),3) == i:  s+="{},".format(i) print(s[:-1]) 

用户三次登录

for i in range(3):     name = input()     pwd = input() if name == "Kate" and eval(pwd) == 666666: print("登录成功！") break else: print("3次用户名或者密码均有误！退出程序。") 

（以上所有的练习，来自Python123平台）