Python 第三堂

List

names = ["小明" ,"小王", "阿華", "阿達"]

for name in names:
    print(name)

初始化方式

初始化方式有兩種

l1 = list() # list是函式，()用來呼叫函式
l2 = []

print(l1)
print(l2)

l1.append("1")
l2.append("1")

print(l1)
print(l2)

指定陣列

names = ["小明" ,"小王", "阿華", "阿達"]

print(names[2])

# :冒號代表從哪一項開始 到第幾項結束
print(names[0:3]) # 從0到2，不包含第三項
print(names[1:4])

print(names[:]) # 都沒給值，他會印全部
print(names[2:]) # 給起始值 沒給結束值
print(names[:2]) # 給結束值

s = "冒號代表從哪一項開始 到第幾項結束。"

print(s[5:10])

# 負數 會從後面開始印，-1 為最後一項
# 如果不知道陣列長度，要取最後一項 可以填-1
print(s[len(s)-1], s[-1]) # 這兩個都是印最後一項

print(s[-1], s[-2], s[-3])

print(s[-5:-1])

2D List Array 二維陣列

group 四個人分成兩組，每一組兩人

names2D = [["小明" ,"小王"], ["阿華", "阿達"]]

for group in names2D:
    for name in group:
        print(name)

names2D = [["小明" ,"小王", "小光"], ["阿華", "阿達", "阿美"]]

for group in names2D:
    print(group)

3D List 三維陣列

names3D = [ # 全校共有12人
    [["小明" ,"小王", "小光"], ["阿華", "阿達", "阿美"]], #這排是班級，班級內分成兩組
    [["小王" ,"小美", "小華"], ["阿明", "阿邀", "阿吳"]], #這排是班級
    ]

# 把 names3D 當作 school(學校)

for classroom in names3D:
    for group in classroom:
        for name in group:
            print(name)
        

可以加幾個人、刪除幾個人、印出group或其他變數試試

names3D = [ # 全校共有12人
    [["小明" ,"小王"], ["阿華", "阿達", "阿美"]], #這排是班級，班級內分成兩組
    [["小王" ,"小美"], ["阿邀", "阿吳"]], #這排是班級
    ]

# 把 names3D 當作 school(學校)

for classroom in names3D:
    for group in classroom:
        print(group)

names3D = [ # 全校共有12人
    [["小明" ,"小王"], ["阿華"], ["阿達", "阿美"]], #這排是班級，班級內分成兩組
    [["小王" ,"小美"], ["阿邀", "阿吳"]], #這排是班級
    [["邊緣人"]],
    ]

# 把 names3D 當作 school(學校)                         

for classroom in names3D:
    print(len(classroom))
    print(classroom)

List 操作

append 附加

names = ["小明" ,"小王", "阿華", "阿達"]
print(names)

names.append("小帥") # append 加在尾巴
print(names)

insert 插入

names = ["小明" ,"小王", "阿華", "阿達"]
print(names)

names.insert(2, "小帥") # 插入，插在第幾項，可以從中間插入
print(names)

pop 彈出

names = ["小明" ,"小王", "阿華", "阿達"]
print(names)

names.pop() # pop彈出最後一項
print(names)

names.pop(1) # pop彈出第幾項
print(names)

remove 移除

names = ["小明" ,"小王", "阿華", "阿達"]
print(names)

names.remove("阿華") # remove移除指定物件
print(names)

字串操作

names = ["小明" ,"小王", "阿華", "阿達"]
string = "小明 小王 阿華 阿達"

for name in names:
    print(name)

print("==========")

for s in string:
    print(s)

print("==========")

for name in names:
    for n in name:
        print(n)