TQC-第六大類-串列List

串列概要

以下大方向請先熟悉：

串列創建

lst=[]

串列新增

lst.append(物件)

串列方法

串列中某數出現的次數

串列.count(某數或某字)

串列某數出現的位置

串列.index(某數或某字)

Python內建函數

加總

sum(物件)

最大值

max(物件)

最小值

min(物件)

602

寫法一：用串列加判斷卡牌

cards=[]
for _ in range(5):
    n=input()
    if n=='J':
        cards.append(11)
    elif n=='Q':
        cards.append(12)
    elif n=='K':
        cards.append(13)
    elif n=='A':
        cards.append(1)
    else:
        cards.append(int(n))
print(sum(cards))

寫法二：利用字典（第七類內容），簡化可讀性

mapping = {'J': 11, 'Q': 12, 'K': 13, 'A': 1}
cards = []

for _ in range(5):
    n = input()
    if n in mapping:
        cards.append(mapping[n])
    else:
        cards.append(int(n))

print(sum(cards))

604眾數

大家最討厭的郭橐駝

寫法一：計算陣列每一格的次數，詳細請參見instgram個人頁

nums=[]
for _ in range(10):
    nums.append(int(input()))

mode=0
mode_num=0
for num in nums:
    if nums.count(num)>mode:
        mode=nums.count(num)
        mode_num=num
    
print(mode_num)
print(mode)

寫法二：使用Counter這個容器

使用Counter中的功能most_common(1) ，意思為出現最多次的數字

from collections import Counter
nums=[]
for _ in range(10):
    nums.append(int(input()))
nums=Counter(nums)

print(nums.most_common(1)[0][0])
print(nums.most_common(1)[0][1])

606二維矩陣輸出

建議搭配410畫星星一起使用就好

def compute():
    ...
n=int(input())
m=int(input())
for i in range(n):
    for j in range(0-i,m-i):
        print(f'{j:4}',end='')
    print()

若真正要符合題意，可練習創造二維串列

def compute(rows,cols):
    a=[[0]*cols for _ in range(rows)]
    for i in range(rows):
        for j in range(cols):
            a[i][j]=j-i
    return a

rows=eval(input())
cols=eval(input())

a=compute(rows, cols)
for rows in a:
    for val in rows:
        print(f'{val:4}',end='')
    print()

608 二維串列的索引

把二維看成一維，詳情可看個人頁

lst=[]
for _ in range(9):
    lst.append(int(input()))
mx=max(lst)
mn=min(lst)
li=lst.index(mx)
si=lst.index(mn)
print(f'Index of the largest number {mx} is: ({li//3}, {li%3})')
print(f'Index of the smallest number {mn} is: ({si//3}, {si%3})')

610

看你喜歡把訊息寫成print 或是寫在input 裡面

t = []
for i in range(4):
    print(f"Week {i+1}:")
    for j in range(3):
        print(f"Day {j+1}:",end="")
        t.append(eval(input()))
avg=sum(t)/len(t)
print(f"Average: {avg:.2f}")
print(f"Highest: {max(t)}")
print(f"Lowest: {min(t)}")

lst=[]
for i in range(1,5):
    print(f'Week {i}:')
    for j in range(1,4):
        lst.append(eval(input(f'Day {j}:')))
avg=sum(lst)/len(lst)
mx=max(lst)
mn=min(lst)
print(f'Average: {avg:.2f}')
print(f'Highest: {mx}')
print(f'Lowest: {mn}')