---
# System prepended metadata

title: 凱薩密碼

---

## wk15_1214_lineStickerDownload
1. 課本原始檔
2. 影音教學 step by step
3. stickershop 貼圖完整
4. emojishop 表情貼
5. chatGpt - local jpg
6. chatGpt - line png


### 【Inclass practice】


```python
## 課本原始檔

import requests, json, os
from bs4 import BeautifulSoup
#url = 'https://store.line.me/stickershop/product/8991459/zh-Hant' #人的日常
url ='https://store.line.me/stickershop/product/16897/zh-Hant'
html = requests.get(url)

sp = BeautifulSoup(html.text, 'html.parser')

#datas = sp.find_all('li', {'class':'mdCMN09Li FnStickerPreviewItem'})
datas = sp.find_all('li', {'class':'mdCMN09Li FnStickerPreviewItem'})

# 建立目錄儲存圖片
images_dir= "line_1/"
if not os.path.exists(images_dir):
    os.mkdir(images_dir)

for data in datas:
    imginfo = json.loads(data.get('data-preview'))
    id = imginfo['id']
    imgfile = requests.get(imginfo['staticUrl'])
    full_path = images_dir + id + '.png'
    
    with open(full_path, 'wb') as f:
        f.write(imgfile.content)
        print(full_path) 
```


```python
#lineSticker 教學-1
import requests, json, os
from bs4 import BeautifulSoup
```


```python
#lineSticker 教學-2
url = 'https://store.line.me/stickershop/product/8991459/zh-Hant'

html = requests.get(url)
html
```


```python
#lineSticker 教學-3
html.text
```


```python
#lineSticker 教學-4
sp = BeautifulSoup(html.text, 'html.parser')
sp
```


```python
#lineSticker 教學-5
sp.title.text
sp.li.text
```


```python
#lineSticker 教學-6
sp.find_all('li', {'class':'mdCMN09Li FnStickerPreviewItem static-sticker'})
```


```python
#lineSticker 教學-7
sp = BeautifulSoup(html.text, 'html.parser')
datas = sp.find_all('li', {'class':'mdCMN09Li FnStickerPreviewItem static-sticker'})
print(datas)
```


```python
#lineSticker 教學-8
len(datas)
```


```python
#lineSticker 教學-9
for data in datas:
    print(data.get('data-preview'))
```


```python
#lineSticker 教學-10

for data in datas:
    imginfo = json.loads(data.get('data-preview'))
    print(imginfo['id'])#名字
    print(imginfo['staticUrl'])
```


```python
#lineSticker 教學-11

imges_dir = "line_image/"
if not os.path.exists(imges_dir):
    os.mkdir(imges_dir)

    
for data in datas:
    imginfo = json.loads(data.get('data-preview'))
    id = imginfo['id']
    imgfile = requests.get(imginfo['staticUrl'])  
    full_path = imges_dir + id + '.png'
    
    with open(full_path,  'wb') as f:
        f.write(imgfile.content)
        print(full_path)
        
```


```python
#stickershop 完整

import requests, json, os
from bs4 import BeautifulSoup

#url = 'https://store.line.me/stickershop/product/8991459/zh-Hant' #人的日常

url = 'https://store.line.me/stickershop/product/24885624/zh-Hant' #喵咪跟兔嘰
html = requests.get(url)


sp = BeautifulSoup(html.text, 'html.parser')
datas = sp.find_all('li', {'class':'mdCMN09Li FnStickerPreviewItem static-sticker'})

imges_dir = "line_image/"
if not os.path.exists(imges_dir):
    os.mkdir(imges_dir)

    
for data in datas:
    imginfo = json.loads(data.get('data-preview'))
    id = imginfo['id']
    imgfile = requests.get(imginfo['staticUrl'])  
    full_path = imges_dir + id + '.png'
    
    with open(full_path,  'wb') as f:
        f.write(imgfile.content)
        print(full_path)
        

```


```python
#表情貼-1
import requests, json, os
from bs4 import BeautifulSoup

#url = 'https://store.line.me/stickershop/product/8991459/zh-Hant' #人的日常
#url = 'https://store.line.me/stickershop/product/24885624/zh-Hant' #喵咪跟兔嘰

url = 'https://store.line.me/emojishop/product/646b23ff903b5543729ffa4d/zh-Hant' #超實用❤生活用語對話框
#url = 'https://store.line.me/emojishop/product/61b04cbaf864dd7f3763ab8b/zh-Hant' #超實用❤手勢/符號 動態表情貼

html = requests.get(url)

html
```


```python
#表情貼-2
sp = BeautifulSoup(html.text, 'html.parser')
#datas = sp.find_all('li', {'class':'mdCMN09Li FnStickerPreviewItem static-sticker'})
#datas = sp.find_all('li', {'class':'mdCMN09Li FnStickerPreviewItem'})
datas = sp.find_all('li', {'class':'mdCMN09Li FnStickerPreviewItem'})

print(datas)
```


```python
#表情貼-3
imges_dir = "line_image_emojishop/生活用語對話框/"
if not os.path.exists(imges_dir):
    os.mkdir(imges_dir)

    
for data in datas:
    imginfo = json.loads(data.get('data-preview'))
    id = imginfo['id']
    imgfile = requests.get(imginfo['staticUrl'])  
    full_path = imges_dir + id + '.png'
    
    with open(full_path,  'wb') as f:
        f.write(imgfile.content)
        print(full_path)
        
```


```python
## chatGpt  local jpg
import shutil

source_path = r'C:\zzz\2.jpg'
destination_path = r'C:\zzz\22.jpg'

# 複製文件
shutil.copyfile(source_path, destination_path)

print(f'已從 {source_path} 複製到 {destination_path}')
```


```python
## chatGpt line png

import requests
import os

url = 'https://stickershop.line-scdn.net/stickershop/v1/sticker/293948094/iPhone/base/plus/sticker@2x.png?v=9'
save_path = r'C:\zzz\333.jpg'

#response = requests.get(url, stream=True)
response = requests.get(url)

with open(save_path, 'wb') as file:
    for chunk in response.iter_content(chunk_size=8192):
        file.write(chunk)

print(f'已從 {url} 下載並保存到 {save_path}')

```

### 【afterclass practice】

1. 綜合演練 選擇題1-10  (需抄題在markdown cell ; 有程式碼的題目要有code cell )
2. 教學影音 lesson 10
3. 請填寫小組報告主題  --- 【期末小組】管理
4. 請填寫筆記網站網址  --- 【OMP】問卷


```python
1. 以open(filename[,mode][,encode]) 開啟檔案，下列何者是 mode 參數預設的模式?

(A) 讀取模式 (B) 寫入模式 (C) 附加模式 (D)以上皆是
```


```python
ANS:( A ) 
```


```python
2. Python 提供何種內建函式，可以開啟指定的檔案，以便進行檔案內容的讀取、寫入或修改？

(A) file() (B) input() (C) open() (D) output()
```


```python
ANS:( C ) 
```


```python
3. 下列何函式可以讀取一列字元？

(A) readable() (B) read() (C) readlines() (D)get(ch)
```


```python
ANS:( B ) 
```


```python
4. 下列程式建立的檔案物件，可以執行何種動作？

f=open('file1.txt','w')

f.write("Hello Python!")

f.close()

(A) 讀取 (B) 寫入 (C) 可讀取也可寫入 (D) 以上皆非
```


```python
ANS:( B ) 
```


```python
5. 執行下列程式，下列顯示結果何者正確？

try:

    print(x)

except:

    print("y")

finally:

    print("z")

(A) x (B) y (C) xz (D) yz
```


```python
try:
    print(x)

except:
    print("y")

finally:
    print("z")
```

    y
    z
    


```python
ANS:( D ) 
```


```python
6. open(filename,mode,encode) 函式的參數中，其中只有那一個參數是必填？

(A) filename (B) mode (C) encode (D) 以上皆是
```


```python
ANS:( A ) 
```


```python
7. 如果作業系統是繁體中文 Windows 系統，預設的編碼為何？

(A) UTF-8 (B) cp950 (C) unicode (D) GB2312
```


```python
ANS:( B ) 
```


```python
8. 下列有關 readlines() 的敘述，何者正確？

(A) 會讀取全部文件內容 (B) 以串列方式傳回

(C) 包括「\n」跳列字元，甚至是隱含的字元 (D) 以上皆是
```


```python
ANS:( D ) 
```


```python
9. 執行下列程式，下列顯示結果何者正確？

n=1

try:

print(n)

except:

print("變數不存在!")

(A) 1 (B) n (C) 變數不存在 (D) 以上皆是
```


```python
n=1

try:
    print(n)

except:
    print("變數不存在!")
```

    1
    


```python
ANS:( A ) 
```


```python
10. 班上的除錯高手大匹，在他的程式中加入了錯誤的補捉在 try…except…finally 敘述中，無論例外有沒有發生都會執行下列那些程式區塊？

(A) try (B) except (C) finally (D) 以上皆是
```


```python
ANS:( C ) 
```

### 【期末專題】

# 凱薩密碼
參考文件: https://github.com/CrypTools/CaesarCipher


```python
import string
import matplotlib.pyplot as plt#畫圖套件

LETTERS = 'abcdefghijklmnopqrstuvwxyz,.() '

#偏移
def encrypt(initial, shift):#加密
  initial = initial.lower()
  output = ""

  for char in initial:
    if char in LETTERS:
      output += LETTERS[(LETTERS.index(char) + shift) % len(LETTERS)]

  return output

def decrypt(initial, shift):#解密
  initial = initial.lower()
  output = ""

  for char in initial:
    if char in LETTERS:
      output += LETTERS[(LETTERS.index(char) - shift) % len(LETTERS)]
      
  return output

def plot_letter_frequency(text):#字母統計
    text = text.lower()
    letter_count = {letter: 0 for letter in string.ascii_lowercase}

    for char in text:
        if char.isalpha():
            letter_count[char] += 1

    letters = list(letter_count.keys())
    counts = list(letter_count.values())

    plt.bar(letters, counts)
    plt.xlabel('Letters')
    plt.ylabel('Frequency')
    plt.title('Letter Frequency in Text')
    plt.savefig('./result.png')

## ---------------  Main  ------------------
message = input('請輸入要加密的訊息: ')
key = int(input('請輸入密鑰: '))

# 加密
cipher = encrypt(message, key)
print(f'\n加密結果: {cipher}')

# 解密
plain = decrypt(cipher, key)
print(f'\n解密結果: {plain}')

#字數統計
plot_letter_frequency(cipher)
```

    請輸入要加密的訊息: Firstly, each character of the initial text (message to encrypt) is converted in a number from 0 to 25, corresponding to its position in the Latin alphabet which contains 26 letters --> (a = 0, b = 1 ... z = 25 ).  Then, each number obtained is transformed by an affine function (f(x) = 1x + b). "x" is representing the number while "b" is defined during the encryption. "b" is the key used to decrypt the final message.  If we take all the images and put them in a list, we obtain n numbers corresponding to n characters of the initial text. The next step consists in finding the values of modulo 26 of each number. (Modulo means remainder)
    請輸入密鑰: 4
    
    加密結果: jmvwxp( diegldglevegxivdsjdxlidmrmxmepdxi.xdbqiwwekidxsdirgv(txcdmwdgsrzivxihdmrdedryqfivdjvsqddxsd dgsvviwtsrhmrkdxsdmxwdtswmxmsrdmrdxlidpexmrdeptlefixd,lmgldgsrxemrwddpixxivwddbedd dfdddaaad)dddcaddxlir diegldryqfivdsfxemrihdmwdxverwjsvqihdf(derdejjmridjyrgxmsrdbjb.cdd.ddfcad.dmwdvitviwirxmrkdxlidryqfivd,lmpidfdmwdhijmrihdhyvmrkdxlidirgv(txmsradfdmwdxlidoi(dywihdxsdhigv(txdxlidjmrepdqiwwekiaddmjd,idxeoideppdxlidmqekiwderhdtyxdxliqdmrdedpmwx d,idsfxemrdrdryqfivwdgsvviwtsrhmrkdxsdrdglevegxivwdsjdxlidmrmxmepdxi.xadxlidri.xdwxitdgsrwmwxwdmrdjmrhmrkdxlidzepyiwdsjdqshypsddsjdiegldryqfivadbqshypsdqierwdviqemrhivc
    
    解密結果: firstly, each character of the initial text (message to encrypt) is converted in a number from  to , corresponding to its position in the latin alphabet which contains  letters  (a  , b   ... z   ).  then, each number obtained is transformed by an affine function (f(x)  x  b). x is representing the number while b is defined during the encryption. b is the key used to decrypt the final message.  if we take all the images and put them in a list, we obtain n numbers corresponding to n characters of the initial text. the next step consists in finding the values of modulo  of each number. (modulo means remainder)
    


    
![png](output_46_1.png)