python编程：从入门到实践-第六章练习

最新推荐文章于 2022-07-09 23:05:37 发布

xiaojz1998

最新推荐文章于 2022-07-09 23:05:37 发布

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分类专栏： python 文章标签： python

本文链接：https://blog.youkuaiyun.com/xiaojz1998/article/details/79677552

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本文通过多个示例展示了如何使用Python中的字典进行各种操作，包括定义、遍历、更新和扩展等。这些示例涵盖了从简单到复杂的多种场景，有助于读者深入理解Python字典的应用。

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#-*-coding:utf-8 -*-
#6-1
person = {'first_name':'Yang','last_name':'xh','age':19,'city':'Beijing'}
for key,value in person.items():
    print(value,end=' ')

#6-2
favorite_number={}
favorite_number['xiaojz']=13
favorite_number['Yangxh']=1
favorite_number['Lirui']=3
favorite_number['Wangy']=6
favorite_number['Alice']=0

#6-3
code_language = {'+':'add','-':'minus','if':'如果','while':'当','return':'返回'}
for i,v in code_language.items():
    print(i,':',v)

#6-4

code_language['print']='打印'
code_language['and']='与'
code_language['or']='或者'
code_language['not']='非'
code_language['%']='除余'
for i,v in code_language.items():
    print(i,':',v)

#6-5
river={'The Yellow River':'china','nile':'egypt','the Indus River':'India'}
for i,v in river.items():
    print(i,'run through',v)
for i in river:
    print(i)
for i in river.values():
    print(i)

#6-6
favorite_languages = {'jen': 'python', 'sarah': 'c', 'edward': 'ruby', 'phil': 'python'}
people=['John','pepper','jen','sarah','edward','phil']
for i in people:
    if i in favorite_languages.keys():
        print('thank you')
    else:
        print('Can you accept our investigation?')

#6-7
people = []
person1 = {'first_name':'Yang','last_name':'ll','age':19,'city':'Tianjin'}
person2 = {'first_name':'Li','last_name':'r','age':19,'city':'Beijin'}
people.append(person)
people.append(person1)
people.append(person2)
for i in people:
    for v,u in i.items():
        print(v,':',u)
    print()

#6-8
pets=[]
Dust = {'kind':'Crow','master':'xiao'}
Maomao = {'kind':'cat','Master':'li'}
zhuzhu = {'kind':'pig','Master':'cheng'}
pets.append(Dust)
pets.append(Maomao)
pets.append(zhuzhu)
for i in pets:
    for v,u in i.items():
        print(v,':',u)
    print()

#6-9
favorite_places={'xiaojz':['Beijin','guangzhou','gansu'],'John':['shanghai','xinjiang','new York'],'Jack':['California','africa','brazil']}
for i,v in favorite_places.items():
    print(i+':',end=' ')
    for u in v :
        print(u,end=' ')
    print()
#6-10

favorite_number={}
favorite_number['xiaojz']=[13,2,1]
favorite_number['Yangxh']=[1,2,3]
favorite_number['Lirui']=[4,5,6]
favorite_number['Wangy']=[7,8,9]
favorite_number['Alice']=[1,2]
for i,v in favorite_number.items():
    print(i+':',end=' ')
    for u in v :
        print(u,end=' ')
    print()

#6-11
cities = {}
cities['Beijin']={'country':'china','population':20000000,'fact':'policy center'}
cities['shanghai'] = {'country':'china','population':24000000,'fact':'sea'}
cities['gansu']={'country':'china','population':26000000,'fact':'desert'}
for i,v in cities.items():
    print(i+':  ',end=' ')
    for a,b in v.items():
        print(a+':',b,end=' ')
    print()