03/18 python 練習解答

暖身題(slice)

raw = list(map(int,input().split()))
raw=raw[::-1]
print(raw)

小練習1(list)

time= int(input())

for time in range(1, time+1):
  number = int(input())
  walls = list(map(int, input().split()))
  
  low = 0
  high = 0
  current = -1
  
  for i in range(number):
    if current >= 0:
      if walls[i] > current:
        high += 1
      elif walls[i] < current:
        low += 1
    current = walls[i]
    
  print("Case "+str(time)+':',high,low)

小練習２(二維list)

a=[]
b=[]
c = [[0 for i in range(2)] for j in range(3)]

for i in range (3):
  row=list(map(int,input().split()))
  a.append(row)


input()

for i in range (3):
  row=list(map(int,input().split()))
  b.append(row)


for i in range(3):
  for j in range(2):
    for n in range (3):
      c[i][j]+=a[i][n]*b[n][j]

for i in range (3):
  for j in range(2):
    print(c[i][j],end=' ')
  print(' ')

矩陣乘法更快的方法(偷教)請不要用來解OJ

python 裡面其實有很多很酷的套件^^
下禮拜瑋嘉老師會詳細介紹~

import numpy as np  #加入這個library~

a=[]
b=[]
c = [[0 for i in range(2)] for j in range(3)]

for i in range (3):
  row=list(map(int,input().split()))
  a.append(row)


input()

for i in range (3):
  row=list(map(int,input().split()))
  b.append(row)

#將a b list 轉成numpy~
a = np.array(a)
b= np.array(b)

#利用np.dot進行矩陣乘法
c= np.dot(a, b)
for i in range (3):
  for j in range(2):
    print(c[i][j],end=' ')
  print(' ')

利用np.dot()進行矩陣乘法 酷吧

小練習3(tuple)

nums = list(map(int, input().split()))
answer9=[]

for i in range(len(nums)-1):
  for j in range(i+1,len(nums)):
    if nums[i]+nums[j] ==9:
      n=(nums[i],nums[j])
      answer9.append(n)
      
print(answer9)

小練習4(dictionary)

dict={1:["Big Mac",530], 2:["Fries(Regular)",330],3:["Cola(Regular)",210],4:["McNuggets(4 pieces)", 230]}
number= list(dict.keys())
price = list(dict.values())

count_kcal=0
for i in range(4):
    print(str(number[i])+price[i][0])
  
print()
while True:
    wan = int(input())
    if wan == 0:
        break
    if wan > 4:
        print("please enter again")
        continue
    print("You'd ordered：",dict[wan][0])
    p = dict[wan][1]
    count_kcal+=p
print("Order received,total calories:",count_kcal,"kcal")