第一周总结复习
python的[官方网站]()
##变量
'''
1.变量的作用:变量是数据的载体
2.变量的命名:字母数字下划线开头,不能用数字开头
不能用关键字,特殊符号 $等开头
大小写敏感(a 和 A 不一样)
PEP 8 要求:
用小写字母拼写,多个单词用下划线隔开
受保护的实例属性用单个下划线开头
私有的实例属性用两个下划线开头
3.变量的类型: int(),float(),str(), chr(), ord()--将字符串转化成对应的编码
'''
##运算符
'''
1.赋值运算符: =(赋值)、+=(加赋值)、-=(减赋值)、*=(乘赋值)、/=(除赋值)、%=(取余赋值)
2.算数运算符: +、-、*、/、%
3.关系运算符: ==(等于)、!=(不等于)、>(大于)、<(小于)、>=(大于等于)、<=(小于等于)
4.逻辑运算符:and(与)、or(或)、not(非)
5.身份运算符
'''
##分支结构
'''
'''
##循环结构
'''
1.while循环:只要某一条件成立,就不断执行循环体里的代码,直到该条件不再成立,条件是否成立同样是逻辑值来表示
2.for循环:循环的循环次数一般是事先定好的,将一个条件变量从某个岂是值开始,一直爹逮到某个终止值后结束
循环控制--pass:什么也不做,只是占据一行代码的位置;
continue:表示立即退出本轮循环,不运行本轮循环的后续代码,并继续执行接下来的循环;
break: 表示立即退出整个循环,后续循环不再执行
'''
python例题练习:(所有代码在python3.5环境下可运行)
1.输入三个数字,计算三角形面积周长:
importmath
a= float(input("请输入三角形边第一条边长:"))
b= float(input("请输入三角形边第二条边长:"))
c= float(input("请输入三角形边第三条边长:"))whileTrue:if a + b > c and a + c > b and b + c >a:
perimeter= a + b +c
p= perimeter / 2g= math.sqrt(p * (p - a) * (p - b) * (p -c))print("三角形周长为:%.2f" %perimeter)print("三角形面积为: %.2f" %g)else:print("-------------This is not triangle!!----------------")break
2.用户输入数字,由电脑来猜:
from random importrandint
user_input= int(input("please input the number you want computer guess>>>:"))
counter=0
low= 1high= 100money= 1000
whileTrue:
guess=randint(low, high)print(guess)
counter+= 1
if user_input ==guess:print("congratulation, computer guess right")print("total guess:", counter)
money+= 200
print("computer has:",money)if money < 500:print("computer you are fucking stupid!!!!")
quit()elif user_input >guess:
low= guess + 1
print("computer guess a higher number")
money-= 100
else: #user_input < guess
high = guess - 1
print("computer guess a lower number:")
money-= 100
3.和电脑猜石头剪刀布:
from random importrandintwhileTrue:
user_guess=int(input("1-- scisoor, 2--stone, 3--handkerchief:"))
cm_guess= randint(1, 3)print(cm_guess)if user_guess ==cm_guess:print("no one lose")elif user_guess == 1 and cm_guess == 2:print("user win")elif user_guess == 2 and cm_guess == 3:print("computer win")elif user_guess == 3 and cm_guess == 2:print("user win")else: #user_guess == 3 and cm_guess == 1:
print("computer win")
4. 打印(2,100)所有素数
importmathdefget_prime(maxNum):
primeList=[]for x in range(2, maxNum + 1):
a=math.sqrt(x)for prime inprimeList:if prime >a:
primeList.append(x)break
if x % prime ==0:break
else:
primeList.append(x)returnprimeListprint(get_prime(100))
5. 打印 '*'
row = int(input("please input the number of row:>>>>>"))for i inrange(row):for j inrange(row):if j < row - i - 1:print(' ', end = '')else:print('*', end = '')print()
6. 打印三角形的大写字母,每行的字母一样:
for x in range(65, 70):for y in range(64, x):print(chr(x), end = '')print()
7. 找出1-10000的水仙花数:
from time import time
from math import sqrt
start = time()
for n in range(1, 10000):
my_sum = 0
for factor in range(1,int(sqrt(n)) + 1):
if n % factor == 0:
my_sum += factor
if factor != 1 and factor != n // factor:
my_sum += n // factor
if my_sum == n:
print(n)
end = time()
print((end - start), 's')
8. 五人抓鱼问题:A把鱼分成五份后扔走一条拿走自己那部分,BCDE用和A一样方法分鱼,求鱼一共有多少条(本题使用穷举法):
fish = 1
whileTrue:
total=fish
is_enough=Truefor _ in range(5):if (total - 1) % 5 ==0:
total= (total - 1) // 5 * 4
else:
is_enough=Falsebreak
ifis_enough:print("the min number of fish is:", fish)breakfish+= 1
9. craps 赌博游戏
# craps 赌博游
from random import randint
money = 1000
while money > 0:
print('players money:', money)
while True:
debt = int(input('please debt:'))
if 0 < debt <= money:
break
face1 = randint(1, 6)
face2 = randint(1, 6)
go_on = False
first_point = face1 + face2
print('玩家摇出了%d点' %first_point)
if first_point == 7 or first_point == 11:
print(" you win!")
money += debt
print("user have: %d" % money)
elif first_point == 2 or first_point == 3 or first_point == 12:
print(" computer win!")
money -= debt
print("user have: %d" % money)
else:
go_on = True
while go_on:
face1 = randint(1, 6)
face2 = randint(1, 6)
current_point = face2 + face1
print('玩家摇出了%d点' % current_point)
if current_point == 7:
print("user lose!")
money -= debt
go_on = False
print("user have: %d" % money)
elif current_point == first_point:
print("user win!")
money += debt
go_on = False
print("user have: %d" %money)
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