from VideoCapture import Device
import time, string

interval = 2

cam = Device(devnum=0, showVideoWindow=0)

# cam.setResolution(648, 480)
cam.saveSnapshot('image.jpg', timestamp=3, boldfont=1, quality=75)

i = 0
quant = interval * .1
starttime = time.time()
while 1:
    lasttime = now = int((time.time() - starttime) / interval)
    print(i)
    cam.saveSnapshot('image.jpg', timestamp=3, boldfont=1)

    i += 1
    while now == lasttime:
        now = int((time.time() - starttime) / interval)
        time.sleeqp(quant)
 

執行後出現如下錯誤：

D:\Python\python3.exe "D:/PyCharm files/face/other_try/text.py"

Traceback (most recent call last):
  File "D:/PyCharm files/face/other_try/text.py", line 9, in <module>
    cam.saveSnapshot('image.jpg', timestamp=3, boldfont=1, quality=75)
  File "D:\Python\lib\site-packages\VideoCapture\__init__.py", line 234, in saveSnapshot
    self.getImage(timestamp, boldfont, textpos).save(filename, **keywords)
  File "D:\Python\lib\site-packages\VideoCapture\__init__.py", line 154, in getImage
    'RGB', (width, height), buffer, 'raw', 'BGR', 0, -1)
  File "D:\Python\lib\site-packages\PIL\Image.py", line 2342, in fromstring
    "Please call frombytes() instead.")

NotImplementedError: fromstring() has been removed. Please call frombytes() instead.

解決：

首先找到"D:\Python\lib\site-packages\PIL\Image.py"檔案的2341行，會發現程式碼如下，用raise報出NotImplementedError錯誤，而NotImplementedError表示沒有實現的錯誤。可能由於版本更新的問題，fromstring()這個函式已經不存在了，需要把遇到的fromstring修改成frombytes。

然後按照錯誤繼續往上找，找到"D:\Python\lib\site-packages\VideoCapture\__init__.py"檔案，把153行的fromstring修改成frombytes即可。

這裡附上另外一篇部落格https://blog.csdn.net/grey_csdn/article/details/77074707，對於NotImplementedError的使用和理解有很大的幫助。