快乐又不要钱，为什么不呢？

【注】本文中所有的代码本人全部测试通过后才写在下面。考虑到夹杂结果图片太乱，所以没加。大家复制代码拿去运行即可。

前面章节的答案后续会补上。

【注】所有包含中文的代码都必须把编码设置成UTF-8才能正常运行。我用的是Geany，设置方法为：文档——设置文件编码——Unicode-——UTF-8

持续更新……

第二章

print("Hello my new life,\nhllo ,the technology world.\nplese be gentle to me.")

2-2

message="Hello my new life,\nhllo ,the technology world.\nplese be gentle to me."
print(message)

2-3

name = 'Eric'
print('Hello '+name+', would you like to learn some pyghon today?')

2-4

name = 'eric'
print(name.title())
print(name.upper())
print(name.lower())

name = 'albert einstein'
saying="A person who never made a mistake never tried anything new."
print(name.title()+"once said"+": "+'\n\t"'+saying+'"')

name = ' albert einstein '
saying="A person who never made a mistake never tried anything new."
print(name.title())
print(name.title().lstrip().rstrip()+"once said"+": "+'\n\t"'+saying+'"')
print(name.strip())

print(80/10)
print(2*4)
print(10-2)
number=4
print("my favorite number is "+str(number))

第三章

names=['王辰','王杰','许博文','肖嘉良','田家铭','徐汉章']
for name in names:
    print(name)
names=['王辰','王杰','许博文','肖嘉良','田家铭','徐汉章']
for name in names:
    print('Hello '+name+" it's good to see you !")
names=['car','bicycle','shared bikes','motorcycle','bus']
for name in names:
    print('To be the truth ,my favorite vehicle is '+name+'.')

names=['泽东','和珅','胡雪岩','华罗庚','王羲之']
for name in names:
    print('Dear '+name+' ,i respectfully invite you to join me for dinner.')

names=['泽东','和珅','胡雪岩','华罗庚','王羲之']
for name in names:
    print('Dear '+name+' ,i respectfully invite you to join me for dinner.')
print('\n\nSorry the '+names[-2]+' has no time these days ,please call someone else.')
names[-2]='张三丰'
print(names)
for name in names:
    print('Dear '+name+' ,i respectfully invite you to join me for dinner.')

names=['泽东','和珅','胡雪岩','华罗庚','王羲之']
for name in names:
    print('Dear '+name+' ,i respectfully invite you to join me for dinner.')
print('\n\nSorry the '+names[-2]+' has no time these days ,please call someone else.')
names[-2]='张三丰'
print(names)
for name in names:
    print('Dear '+name+' ,i respectfully invite you to join me for dinner.')
print('My lovely friends ,i have find a bigger desk and now we can invite more friends')
print(names)
print('\n')
names.append('老子')
names.insert(0,'水阡陌')
for name in names:
    print('Dear '+name+' ,i respectfully invite you to join me for dinner.')

names=['泽东','和珅','胡雪岩','华罗庚','王羲之']
for name in names:
    print('Dear '+name+' ,i respectfully invite you to join me for dinner.')
print('\n\nSorry the '+names[-2]+' has no time these days ,please call someone else.')
names[-2]='张三丰'
print(names)
for name in names:
    print('Dear '+name+' ,i respectfully invite you to join me for dinner.')
print('My lovely friends ,i have find a bigger desk and now we can invite more friends')
print(names)
print('\n')
names.append('老子')
names.insert(0,'水阡陌')
for name in names:
    print('Dear '+name+' ,i respectfully invite you to join me for dinner.')
print(names)
print('Oh my God ,now i have to pick two of you \n')
for index in range(2,len(names)):
    pop_name=names.pop()
    print("sorry "+pop_name+" i can't help it ,because the book says.")
for name in names:
    print('Dear '+name+ ' everything went according to plan.')
del names[-1]
del names[0]
print(names)

tourist_attractions=['shenzhen','guangzhou','shanghai','jinlinqu']
print(tourist_attractions)
print(sorted(tourist_attractions))
print(tourist_attractions)
print(sorted(tourist_attractions,reverse=True))

tourist_attractions=['shenzhen','guangzhou','shanghai','jinlinqu']
print(tourist_attractions)
print(sorted(tourist_attractions))
print(tourist_attractions)
print(sorted(tourist_attractions,reverse=True))
print(tourist_attractions)
tourist_attractions.reverse()
print(tourist_attractions)
tourist_attractions.reverse()
print(tourist_attractions)
tourist_attractions.sort()
print(tourist_attractions)
tourist_attractions.sort(reverse=True)
print(tourist_attractions)

names=['毛泽东','和珅','胡雪岩','华罗庚','王羲之']
for name in names:
    print('Dear '+name+' ,i respectfully invite you to join me for dinner.')
print('\n\nSorry the '+names[-2]+' has no time these days ,please call someone else.')
names[-2]='张三丰'
print(names)
print(len(names))

第四章

pizzas=['zebra','peacock','panda']
for pizza in pizzas:
    print('My favorite pizza is '+pizza+'.')
print('I really like pizza.')

animals=['zebra','peacock','panda']
for animal in animals:
    print(animal+' in China is the protected-animals.')
print('They are the part of this world ,in other words ,it is our friends.')

#4-3
for number in range(1,21):
    print(number)
print('\n'+'=====================')
#4-4
#for num in range(1,1000001):
#    print(num)
#4-5
number=list(range(1,1000001))
print(min(number))
print(max(number))
print(sum(number))
print('\n'+'=====================')
#4-6
odds=list(range(1,21,2))
for odd in odds:
    print(odd)
print('\n'+'=====================')
#4-7
three_multiple=[num*3 for num in range(1,31)]
for number in three_multiple:
    print(number)
print('\n'+'=====================')
#4-8
cubes=[num**3 for num in range(1,11)]
for cube in cubes:
    print(cube)
print('\n'+'=====================')
#4-9同4-8

pizzas=['zebra','peacock','panda','shark','dolphin','eagle']
print('The first three items in this list is: ')
print(pizzas[:3])
print('The items from the middle of list is: ')
print(pizzas[1:4])
print('The last three items in this list is: ')
print(pizzas[-3:])

pizzas=['zebra','peacock','panda','shark','dolphin','eagle']
print('The first three items in this list is: ')
print(pizzas[:3])
print('The items from the middle of list is: ')
print(pizzas[1:4])
print('The last three items in this list is: ')
print(pizzas[-3:])
#4-10
friend_pizzas=pizzas[:]
friend_pizzas.append('bear')
print("My favorite pizza is:\n")
for pizza in pizzas:
    print(pizza)
print('++++++++++++++')
print("My friend favorite pizza is :\n")
for pizza in friend_pizzas:
    print(pizza)

foods=('steamed stuffed bun','steamed bun','dumplings','congee','rice')
for food in foods:
    print(food)
print('\n')
#foods[0]='rice'
foods=('noodle','hot pot','dumplings','congee','rice')
for food in foods:
    print(food)

第五章

car='subaru'
print("Is car=='subaru'? I predict True.")
print(car=='subaru')
print("\nIs car =='audi'? Ipredict False.")
print(car=='audi')
animal='peacock'
print(animal=='zebra')

yesterday_you_said="you are my only lover forever."
Today_you_say="you can't control who I really love."
print(yesterday_you_said==Today_you_say)
print('\n')
your_dream="Success"
situation="success"
print(your_dream.lower()==situation)
print(34<=4)
if 34<45 and 100*2<=400:
    print("the computer is better than child.")
new_words=['peacock','cube','eagle']
if 'peacock' in new_words:
    print("you can figure it!")
if 'bear' not in new_words:
    print("take care yur eyes!")

alien_color='green'
if alien_color=='green':
    print("you get 5 points")
alien_color='red'
if alien_color=='green':
    print("you get 5 points")

alien_color='red'
if alien_color=='green':
    print("you get 5 points")
else:
    print("you get 10 points")

alien_color='green'
if alien_color=='greaen':
    print("you get 5 points")
elif alien_color=='red':
    print("you get 10 points")
else :
    print("you get 15 points")

age=23
if age<2:
    print("U are an infant.")
elif age<4:
    print("U are a baby")
elif age<13:
    print("U are a child.")
elif age<20:
    print("U are a youngth.")
elif age<65:
    print("U are an adult.")
else :
    print("U are an elder.")

fruit=['orange','apple','graph','banana']
if 'apple' in fruit:
    print("you like apple.")
if 'graph' in fruit:
    print("you like graph.")
if 'watermellion' not in fruit:
    print('you do not like watermallion')

guests=['admin','A','W','L','Z']
for guest in guests:
    if guest=='admin' :
        print("love you my admin~~")
    else :
        print("welcome home "+guest +".")

guests=[]
if guests:
    for guest in guests:
        if guest=='admin' :
            print("love you my admin~~")
        else :
            print("welcome home "+guest +".")
else:
    print("We need to find some users!")

current_users=['A','B','C','D','E']
new_users=['A','B','X','Y','S']
for new_user in new_users:
    if new_user in current_users:
        print('Sorry ,you need to change your name!')
    else:
        print('This name has never been used!')

【做这一问时遇到了问题，我先把正解写在下面再把我错误那个 拿出来分析】

#这是正解 
current_users=['A','B','C','D','E']
curren_users=[x.swapcase() for x in current_users]
new_users=['A','B','X','S','Y']
for user in new_users:
    if user.lower() in current_users:
        print('Sorry ,this name has been used ')
    else :
        print('Ok ,you have a new name')
#这是有问题的代码 
current_users=['A','B','C','D','E']
#我主要错在这个for 循环，我想把列表中所有元素变小写。
for current_user in current_users:
    store=current_user.lower()
    current_users.append(store)
    current_users.remove(store)
print(current_users)
new_users=['a','B','X','Y','S']
for user in new_users:
    if user.lower() in current_users:
        print('Sorry ,you need to change your name!')
    else:
        print('This name has never been used!')
错误分析：
就是，for 循环是始终按索引+1去遍历，在删除了第一个元素之后，我想要遍历的第二个元素变成了第一个元素，
但此时for 循环认为已经遍历完了第一个，开始遍历第二个。此时的第二个就是没删除元素时的第三个元素。所以我看到的是跳了一个的结果

nums=[1,2,3,4,5,6,7,8,9]
for num in nums:
    if num==1:
        print(str(num)+'st')
    elif num==2:
        print(str(num)+'nd')
    elif num==3:
        print(str(num)+'rd')
    else:
        print(str(num)+'th')

第六章

acquaintance={
    'first_name':'zhang',
    'last_name':'shuyu',
    'city':'heilongjiang',
    }
print(acquaintance['first_name'])
print(acquaintance['last_name'])
print(acquaintance['city'])

favorate_num={
    'me':'2',
    'she':'3',
    'he':'8',
    }
print(favorate_num['she'])

words={
    'str':'change the number to string',
    'list':'to form a list',
    'lstrip':'delete the left blank in the string',
    'range':'to form a series of number between '+
    'the first number and the end number',
    'swapcase':'change the upper to lower or reverse',
    }
print('str'+': '+words['str']+'\n')
print('list'+': '+words['list']+'\n')
print('lstrip'+': '+words['lstrip']+'\n')
print('range'+': '+words['range']+'\n')
print('swapcase'+': ' +words['swapcase']+'\n')

rivers={
    'Rhine':'Switzerland',
    'changJiang':'china',
    'nile':'egypt',
    }
for river,country in rivers.items():
    print('The '+river.title()+'runs through the '+country.title()+'.')
#这道题需要注意的地方是 for 循环的用法，其中，rivers.items()不要忘了items()

favorate_languages={
    'A':'english',
    'C':'chinese',
    'D':'python',
    'X':'ahahha',
    }
inquiry_list=['A','C','D','W']
for name in inquiry_list:
    if name in favorate_languages.keys():
        print('you need to have a life you like and meet the lover one for you')
    else:
        print('if there is a mess, change it')

acquaintance_1={
    'first_name':'zhang',
    'last_name':'shuyu',
    'city':'heilongjiang',
    }
acquaintance_1={
    'first_name':'zhang',
    'last_name':'shuyu',
    'city':'heilongjiang',
    }
acquaintance_2={
    'first_name':'liu',
    'last_name':'fang',
    'city':'dalian',
    }
acquaintance_3={
    'first_name':'cui',
    'last_name':'shijie',
    'city':'hubei',
    }
people=[acquaintance_1,acquaintance_2,acquaintance_3]
for person in people:
    print(person)

cat={
    'category':'bosi',
    'lord':'fangfang'
    }
dog={
    'category':'dubin',
    'lord':'haha',
    }
rabbit={
    'category':'white',
    'lord':'dadada'
    }
pets=[cat,dog,rabbit]
for pet in pets:
    print(pet)

favorate_places={
    'me':['changjiang','huanghe','shaolinsi'],
    'she':['harBin','jilin','nanjing'],
    'he':['beside his home a yard']
    }
for man,places in favorate_places.items():
    print(man+': ')
    for place in places:
        print(place)
    print('\n')

favorate_num={
    'me':['2','5','8'],
    'she':['3','6','9'],
    'he':['7','4','1'],
    }
for name,number in favorate_num.items():
    print(name+'\'s favorate number are :')
    for num in number:
        print(num)
    print('\n')

cities={
    'luoyang':{
        'belong':'china',
        'population':'1000000',
        'fact':'the peony\'s hometown',
    },
    'paris':{
        'belong':'france',
        'population':'2000',
        'fact':'Notre Dame de Paris was set on fire'
    },
    'moscow':{
        'belong':'Russia',
        'population':'34000',
        'fact':'fierce fighting people',
    }
}
for city,info in cities.items():
    print(city.title()+':'+'\n')
    for attribute,detail in info.items():
        print(attribute.title()+': '+detail.title())