《python从入门到实践》部分答案
学到游戏部分，突然发现有些知识点不是很熟悉，出现了对照着书才能把代码写好的状况，所以决定把前面的习题重新做一遍，算是对知识的复习，没有做的部分和我挑的题目大相庭径，基本算是重复，所以放弃了部分习题。
2-1
a = 1
print(a)
3-1
names = ['linger','huangdui','junainai']
for name in names:
print(name)
3-2
names = ['linger','huangdui','junainai']
for name in names:
print('welcome,'+name)
3-8
places = ['taiwan','hanguo','meiguo','beijin']
places.sort()# 按字母顺序排列
for place in places:
print(place)
places.reverse()# 按照原有相反的顺序排列
for place in places:
print(place)
3-9
places = ['taiwan','hanguo','meiguo','beijin']
print(len(places))
4-3
for value in range(1,21):
print(value)
4-4
list = [] #为了可以使用sum等的函数，要将数字输入进去
for value in range(1,1000001):
list.append(value)
sum(list)
print(sum(list)) #只能打印字符
4-6
for value in range(1,21,2): #最后一个2表示步长
print(value)
4-7
for value in range(3,31):
if value%3 == 0: #其中的%是取余函数
print(value)
4-8
for value in range(3,31):
print(str(value**3))# print只能打印字符串，所以要强制把结果变为字符
4-9
#列表解析就是要用好* for * in *
list = [value**2 for value in range(1,11)]
print(list)
4-10
list = [value**2 for value in range(1,11)]
print(list)
print('The first three items in the list are:')
print(list[0:3])
print('Three items from the middle of the list are:')
print(list[3:6])
print('The last items of the list are:')
print(list[6:])
元组中要注意的地方是，元组中的元素不能随便修改，比如
yuanzu = （200，50）
yuanzu[0] = 250
#这一步是在尝试修改元组中的第一个元素
这一步执行的结果就是会报错，要修改只能成对修改
4-13
wjwd = ('mnzwr','xhnrg','ggbc','ymdx','ky')
for cai in wjwd:
print(cai)
wjwd[1]= 'hahayu'
print(wjwd)
5-6
age = int(input('Please input your age:'))
if age < 2:
print('You are a baby!')
elif 2 <= age < 4:
print('You are learning to walk!')
elif 4 <= age < 13:
print('You are a child!')
elif age >= 13:
print('You are a young man!')
5-8
current_users = ['admin','lizixuan','jiangweijie','lichao','juran']
for current_user in current_users:
if current_user == 'admin':
print('Hello admin,would you like to see a status report?')
else:
print('Hello '+current_user+',thank you for logging in again.')
5-9
current_users = ['admin','lizixuan','jiangweijie','lichao','juran']
for current_user in current_users:
if current_user == 'admin':
print('Hello admin,would you like to see a status report?')
else:
print('Hello '+current_user+',thank you for logging in again.')
current_users = []
if current_user:
print('we need to find some users!')
6-1
msw ={"first_name":"ma","last_name":"suowen","age":"24","city":"yangzhou"}
for key,value in msw.items():
print("my friend's "+key+" is "+value)
运行结果：
my friend's first_name is ma
my friend's last_name is suowen
my friend's age is 24
my friend's city is yangzhou
[Finished in 0.1s]
6-7
嵌套（）这一题是列表里有字典
peoples = [{'msw':{"first_name":"ma","last_name":"suowen","age":"24","city":"yangzhou"}},{'wp':{"first_name":"wang","last_name":"pei","age":"24","city":"danyang"}}]
for people in peoples:
for key,value in people.items():
for key1,valu in value.items():
print("my friend "+key+"'s"+key1+'is'+valu)
运行结果
my friend msw’sfirst_nameisma
my friend msw’slast_nameissuowen
my friend msw’sageis24
my friend msw’scityisyangzhou
my friend wp’sfirst_nameiswang
my friend wp’slast_nameispei
my friend wp’sageis24
my friend wp’scityisdanyang
[Finished in 0.2s]
7-4
ingredients = []
mark = True
while mark:
ingredient = input("please input your ingredients:")
if ingredient != 'quit':
ingredients.append(ingredient)
else:
break
print(ingredients)
运行结果：
jurandeMacBook-Pro:~ juran$ cd python
jurandeMacBook-Pro:python juran$ python3 7-4.py
please input your ingredients:happy
please input your ingredients:hahah
please input your ingredients:nidene
please input your ingredients:cheer up
please input your ingredients:quit
['happy', 'hahah', 'nidene', 'cheer up']
jurandeMacBook-Pro:python juran$
9-1
类
class Restaurant():
def __init__(self,restuarant_name,restaurant_cisine_type):
self.name = restuarant_name
self.cuisinetype = restaurant_cisine_type
def describe_restaurant(self):
print("This restuarant's name is "+self.name+" and this restuarant has "+ self.cuisinetype+" cuisine type!")
def open_restaurant(self):
print("this restuarant is opening now!")
my_restuarant = Restaurant("ryker",'18')
my_restuarant.describe_restaurant()
my_restuarant.open_restaurant()
运行结果：
jurandeMacBook-Pro:python juran$ python3 review.py
This restuarant's name is ryker and this restuarant has 18 cuisine type!
this restuarant is opening now!
Car.py
class Car():
def __init__(self,make,model,year):
self.make = make
self.model = model
self.year = year
self.odometer_reading = 0
def get_descriptive_name(self):
long_name = str(self.year)+' '+self.make+' '+self.model
return long_name.title()
def read_odometer(self):
print("This car has " + str(self.odometer_reading)+" mile on it.")
def update_odometer(self,value):
if value >= self.odometer_reading:
self.odometer_reading = value
else:
print("you can't roll back an odometer!") #设定里程数是不能修改的
def increment_odometer(self,meter):
self.odometer_reading += meter
class Battery():
def __init__(self, battery_size = 70):
self.battery_size = battery_size
def describe_battery(self):
print("This car has a "+ str(self.battery_size)+"-kwh battery.")
my_new_car = Car('audi','a4','2016')
print(my_new_car.get_descriptive_name())
my_new_car.update_odometer(23)
my_new_car.increment_odometer(10)
my_new_car.read_odometer()
class ElectricCar(Car):
def __init__(self,make,model,year):
super().__init__(make,model,year)
self.battery = Battery()
my_tesla = ElectricCar('tesla','model\'s','2016')
print(my_tesla.get_descriptive_name())
my_tesla.battery.describe_battery()
运行结果：
jurandeMacBook-Pro:python juran$ python3 Car.py
2016 Audi A4
This car has 33 mile on it.
9-5
class User():
def __init__(self,login_attempts):
self.login_attempts = login_attempts
def increment_login_attempts(self):
self.login_attempts += 1
def reset_login_attempts(self):
self.login_attempts = 0
First_user = User(3)
First_user.increment_login_attempts()
print(First_user.login_attempts)
First_user.increment_login_attempts()
print(First_user.login_attempts)
First_user.reset_login_attempts()
print(First_user.login_attempts)
运行结果：
jurandeMacBook-Pro:python juran$ python3 Car.py
4
5
0
12-2 游戏角色
找一副你喜欢的图，转化为位图，创建一个类将其绘制到屏幕中央
practice.py
import sys
import pygame
from like_image import Like_image
def display_build():
pygame.init()
screen = pygame.display.set_mode((800,800))
pygame.display.set_caption('a new display')
bg_color = (0,0,255)
while True:
for event in pygame.event.get():
if event.type == pygame.QUIT:
sys.exit()
screen.fill(bg_color)
my_like_image = Like_image(screen)
my_like_image.blitme()
pygame.display.flip()
display_build()
like_image.py
import pygame
class Like_image():
def __init__(self,screen):
self.screen = screen
self.image = pygame.image.load('images/ship.bmp')
self.rect = self.image.get_rect()
self.screen_rect = screen.get_rect()
self.rect.centerx = self.screen_rect.centerx
self.rect.bottom = self.screen_rect.bottom
def blitme(self):
self.screen.blit(self.image,self.rect)
12-3
编写一个程序，开始时屏幕中央有一个小火箭，而玩家可使用四个方向键上下左右移动火箭，务必确保火箭不会移到屏幕外面
import sys
import pygame
from pygame.sprite import Group
pygame.init()
screen = pygame.display.set_mode((1000,1000))
pygame.display.set_caption('12-2')
image = pygame.image.load('images/my_love_dog.bmp')
bullet_image = pygame.image.load('images/bullet.bmp')
update_image=pygame.transform.scale(image,(150,100))
update_bullet_image=pygame.transform.scale(bullet_image,(20,40))
position_x = 400
position_y = 500
position = (position_x,position_y)
position_bullet_x = position_x + 65
position_bullet_y = position_y - 40
flag_right = False
flag_left = False
flag_up = False
flag_down = False
while True:
position = (position_x,position_y)
position_bullet = (position_bullet_x,position_bullet_y)
position_bullet_y = position_bullet_y - 10
for event in pygame.event.get():
if event.type == pygame.QUIT:
sys.exit()
elif event.type == pygame.KEYDOWN:
if event.key == pygame.K_RIGHT:
flag_right = True
elif event.key == pygame.K_LEFT:
flag_left = True
elif event.key == pygame.K_UP:
flag_up = True
elif event.key == pygame.K_DOWN:
flag_down = True
elif event.type == pygame.KEYUP:
if event.key == pygame.K_RIGHT:
flag_right = False
elif event.key == pygame.K_LEFT:
flag_left = False
elif event.key == pygame.K_UP:
flag_up = False
elif event.key == pygame.K_DOWN:
flag_down = False
if position_x == 0:
flag_left = False
if position_x ==850:
flag_right = False
if position_y == 0:
flag_up = False
if position_y == 900:
flag_down = False
if flag_right:
position_x = position_x + 10
if flag_left:
position_x = position_x - 10
if flag_up:
position_y = position_y - 10
if flag_down:
position_y = position_y + 10
screen.fill((130,130,130))
screen.blit(update_image,position)
screen.blit(update_bullet_image,position_bullet)
pygame.display.flip()
运行结果
实现了图片上下左右移动，速度是10个像素。