用書 PYTHON王者歸來 作者洪錦魁
遍歷字典
ClassA = {“Amy”:9,”Cindy”:20 ,”Landy”:30}
for name,number in ClassA.items():
print(name)
print(number)
print(“**************************************************”)
for name in ClassA.keys():
print(name)
執行結果
遍歷VALUE
ClassA = {“Amy”:9,”Cindy”:20 ,”Landy”:30}
for name in ClassA.keys():
print(name)
for num in ClassA.values():
print(num)
執行結果
排序 sorted
ClassA = {“Queen”:100,”Amy”:9,”Cindy”:20 ,”Landy”:30}
for name in sorted(ClassA.keys()):
print(name）
執行結果
ClassA = {“Queen”:100,”Amy”:9,”Cindy”:20 ,”Landy”:30}
print(ClassA)
ClassAlist = sorted(ClassA.items(),key =lambda item:item[1])
print(ClassAlist)
執行結果
建立字典串列
QOO = []for QOO_MEMBERS in range(50):
QOOLIST ={“color”:”blue”,”score”:100,”speed”:”fast”}
QOO.append(QOOLIST)
for QOOLIST in QOO[:5]:
print(QOOLIST)
print(len(QOO))
for QOOLIST in QOO[41:45]:
if QOOLIST[“color”]==”blue”:
QOOLIST[“color”]=”red”
QOOLIST[“score”]=50
QOOLIST[“speed”]=”fast”
for QOOLIST in QOO[40:46]:
print(QOOLIST)
執行結果
字典的值是串列
NAMELIST = {“Susan”:[“Apple”,”Banana”],
“Annie”:[“Peach”],
“Susu”:[“Pizza”]}
for name ,fruits in NAMELIST.items():
print(name)
for friut in fruits:
print(“”,friut)
執行結果
while 迴圈在字典的應用
namelist ={}
survey = True
while survey:
name = input(“Please input your name:”)
score = input(“Plese input your score:”)
namelist[name] = score
repeat = input(“Do you want to submit survey?(y/n)”)
if repeat != “y”:
survey= False
for name ,score in namelist.items():
print(name,”your score is:”,score)
執行結果
建立字典 fromkeys
seq=[“name”,”score”]
D1 =dict.fromkeys(seq)
print(D1)
D2 =dict.fromkeys(seq,”KYOTO”)
print(D2)seq=(“name”,”score”)
D3 =dict.fromkeys(seq)
print(D3)
D4= dict.fromkeys(seq,”HIROSHIMA”)
print(D4)
執行結果
傳回字典KEY的VALUE .get .setdefault
.get KEY若找不到就會傳DEFAULT值，若沒設DEFAULT值得話就傳回NONE
.setdefault 和 .get 基本上相同，但 .get 不會改變字典內容，但 .setdefault 若是鍵不在則會把鍵+DEFAULT加入預設值，沒有 DEFAULT 的話則是NONE
NAMELIST = {“Susan”:”Apple”, “Annie”:”Peach”, “Susu”:”Pizza” }
ret_value = NAMELIST.get(“Susan”)
print(ret_value)ret_value1 = NAMELIST.get(“Susu”)
print(ret_value1)ret_value2 = NAMELIST.get(“MOMO”)
print(ret_value2)ret_value3 = NAMELIST.setdefault(“Susan”)
print(ret_value3)ret_value4 = NAMELIST.setdefault(“KIKI”)
print(ret_value4)ret_value5 = NAMELIST.setdefault(“NINI”,”Milk”)
print(ret_value5)
執行結果
大型字典
class1 =[“Nini”,”Mimi”,”Kiki”,]
class2 =[“Momo”,”Koko”,”Roro”,]
class3 =[“Susu”,”Bubu”,”Nunu”,]
school ={“Class1″: class1,”Class2″:class2,”Class3”:class3}
type(school)
print(school)
執行結果
