1. 簡介
Google Colab
- Google Colab ( Google Colaboratory)是一個以Jupyter Notebook 為開發環境的免費雲端服務
- 可選擇Python 2 或 Python 3
- 提供免費的 GPU (K80) 和 TPU (v2)
- 最長可運行12小時，若閒置過久則會中途自動停止執行
- 可連結自身Google帳號的雲端硬碟做資料操作
Google Drive
- Google 雲端硬碟
- PyDrive 中須注意路徑的指定方式與一般程式寫法不同。並非 ./folder/file.* 這種形式，而是需要指定資料夾的 id
- PyDrive 中需要的 id 取得方法之一為 【右鍵檔案/資料夾 -> 取得檔案共用連結 -> 開啟設定 -> 從連結中擷取 https://drive.google.com/open?id=TARGET_FILE_ID】例如：https://drive.google.com/open?id=1icWmsJmTYsIuMNPBKLdrEh7KXmJJoEoR
- 提供範例程式檔https://colab.research.google.com/drive/17n6KdLKrWRhyHBNlyUWKEh7SriAb1qS9
- 此篇文章中會將Google Drive當作資料庫，透過Colab的程式，執行檔案的存儲、取用以及獲得檔案的共用連結。
2. 語法和範例
安裝 PyDrive套件
!pip install PyDrive輸入模組
from pydrive.auth import GoogleAuth
from pydrive.drive import GoogleDrive
from google.colab import auth
from oauth2client.client import GoogleCredentials使用者身分驗證
- 取得
gauth = GoogleAuth()
auth.authenticate_user()
gauth.credentials = GoogleCredentials.get_application_default()- 存儲
gauth.SaveCredentialsFile("mycreds.txt")- 載入
gauth.LoadCredentialsFile("mycreds.txt")檔案操作
drive = GoogleDrive(gauth)- 建立
# 不指定建立位置，直接建立在drive裡
file1 = drive.CreateFile({'title': 'FILE_NAME_1.txt'})
file1.Upload() # Upload the file.# 指定建立位置，需要目標資料夾id
file1 = drive.CreateFile({'title': 'FILE_NAME_1.txt',
'parents':[{'kind': 'drive#fileLink',
'id': 'target_folder_id'}]})
file1.Upload() # Upload the file.# 指定建立位置，需要目標目錄id
# id取得方法會於下方介紹
file1 = drive.CreateFile({'title': 'FILE_NAME_1.txt',
'parents':[{'kind': 'drive#fileLink',
'id': 'target_folder_id'}]})
file1.Upload()
- 刪除
file1.Trash() # Move file to trash.
file1.UnTrash() # Move file out of trash.
file1.Delete() # Permanently delete the file.- 更新
file1['title'] = 'FILE_NAME_2.txt' # Change title of the file.
file1.Upload() # Update metadata.- 查詢
# 不指定建立位置
file_list = drive.ListFile({'q': "'root' in parents and trashed=false"}).GetList()
for file1 in file_list:
print('title: %s, id: %s' % (file1['title'], file1['id']))# 指定建立位置
file_list = drive.ListFile({'q': "'target_folder_id' in parents and trashed=false"}).GetList()
for file1 in file_list:
print('title: %s, id: %s' % (file1['title'], file1['id']))
完整範例
- 身分驗證 - 使用者驗證
from pydrive.auth import GoogleAuth
from pydrive.drive import GoogleDrive
from google.colab import auth
from oauth2client.client import GoogleCredentialsgauth = GoogleAuth()
auth.authenticate_user()
gauth.credentials = GoogleCredentials.get_application_default()
drive = GoogleDrive(gauth)
- 身分驗證 - 自動化驗證
from pydrive.auth import GoogleAuth
from pydrive.drive import GoogleDrive
from google.colab import auth
from oauth2client.client import GoogleCredentialsgauth = GoogleAuth()gauth.LoadCredentialsFile("mycreds.txt")if gauth.credentials is None:
auth.authenticate_user()
gauth.credentials = GoogleCredentials.get_application_default()
elif gauth.access_token_expired:
gauth.Refresh()
else:
gauth.Authorize()gauth.SaveCredentialsFile("mycreds.txt")drive = GoogleDrive(gauth)
- 檔案操作 - 取得共用連結
file_list = drive.ListFile({'q': "'1icWmsJmTYsIuMNPBKLdrEh7KXmJJoEoR' in parents and trashed=false"}).GetList()
for file1 in file_list:
print('title: %s, id: %s'
%(file1['title'], file1['webContentLink']))3. 參考資料來源
