python learning day four

xinxi={"name":"zhang yong kang","age":23,"city":'shen yang'}
print(xinxi["name"].title())
print(xinxi["age"])
print(xinxi["city"].title())

favorite_number={"zhang yong kang":3,
                 "xu wei nan":5,
                 "wang li hua":6,
                 "chen ren hui":8
                 }
print("zhang yong kang's favorite number is "+
      str(favorite_number["zhang yong kang"])
      +".")
print("xuweinan's favorite number is "+
      str(favorite_number["xu wei nan"])+
      ".")
print("wang li hua's favorite number is "+
      str(favorite_number["wang li hua"])+
      ".")
print("chen ren hui's favorite number is "+
      str(favorite_number["chen ren hui"])+
      ".")

python_word = { " Print " : " Print " , " for " : " loop " , " IF " : " Conditions Test " , " title () " : " capitalized " }
 Print ( " Print " + ' : \ n- ' + python_word [ " Print " ])
 Print ( " for "+':\n'+python_word["for"])
print("if"+':\n'+python_word["print"])
print("title()"+':\n'+python_word["title()"])

= {python_word " Print " : " Print " , " for " : " loop " , " IF " : " Conditions Test " , " title () " : " capitalized " }
 for Word, meaning in python_word.items ( ):
     Print (Word + " : " )
     Print (meaning) 


python_word = { " Print ":"Print " , " for " : " Loops " , " IF " : " Conditions test " , " title () " : " capitalized " } 
python_word [ " Upper () " ] = " full-capitalized " 
python_word [ " Lower () " ] = " all-lowercase letter " 
python_word [ " {} " ] = " dictionary for "
python_word["[ ]"]="用于列表"
for word,meaning in python_word.items():
    print(word+":")
    print(meaning)

lake_nation={"nile":"Egypt","changjiang":"China","amazon":"Brazil"}
for lake,nation in lake_nation.items():
    print("The "+lake+" runs through "+nation+".")

lake_nation={"nile":"Egypt","changjiang":"China","amazon":"Brazil"}
for lake in lake_nation.keys():
    print(lake)

lake_nation={"nile":"Egypt","changjiang":"China","amazon":"Brazil"}
for nation in lake_nation.values():
    print(nation)

favorite_languages={
    'jen':'python',
    'sarah':'c',
    'edward':'ruby',
    'phil':'python'
    }
name_list=['jen','sarah','john','cris']
for name in name_list:
    if name in favorite_languages:
        print(name+" ,Thank you for your attention.")
    else:
        print(name+" ,we want to invite you to participate our investigation.")

people1={"name":"zhang yong kang","age":23,"city":'shen yang'}
people2={"name":"xu zhou","age":23,"city":'nan jing'}
people3={"name":"zhang chang long","age":47,"city":'ma an shan'}
people_all=[people1,people2,people3]
for people in people_all:
    print(people)

cat={"name":"cat","owner":"zhang yong kang"}
dog={"name":"dog","owner":"wang li hua"}
pig={"name":"pig","owner":"xu wei nan"}
pets=[cat,dog,pig]
for pet in pets:
    print(pet)

 

favorite_places={"zhang yong kang":["nan jing","sha men","shen yang"],"wang li hua":["shi jia zhuang","nan jing","bei jing"],"xu wei nan":["tian jing","ha er bin","shen yang"]}
for people, places in favorite_places.items():
    print(people+":")
    for place in places:
        print(place)



favorite_number={"zhang yong kang":[3,4,5,6],
                 "xu wei nan":[1,2,3,4],
                 "wang li hua":[5,6,7,8],
                 "chen ren hui":[1,2,3]
                 }
for name,numbers in favorite_number.items():
    print(name+":")
    for number in numbers:
        print(number)





cities={"nan jing":{"country":"China","population":"10000","fact":"it is hot in summer."},
        "london":{"country":"England","population":"20000","fact":"it is cold in winter."},
        "Los angeles":{"country":"America","population":"30000","fact":"cris live here."}
        }
for city,informations in cities.items():
    print(city+":")
    for information in informations.values():            #第一个for循环 把cities中的值 存储到informations中
        print(information)

 

2、学习疑问与心得（保存的心得不知道怎么消失了）
2.1、遍历字典中键-值 需要用方法.items()  只遍历键 用.keys()  只遍历值 用.values()
2.2、