使用 cv2 时关闭 Python 个文件

Question

提前为可能很简单的修复表示歉意，我是一名学习 C++ 的大学生，并且是第一次在个人项目中使用 python。

我正在编写一个程序，从目录或子目录中的媒体文件中提取标题，然后查看是否有匹配的字符串。如果有则比较它们的分辨率，并删除较低分辨率的文件。如果它们的分辨率相同，则会删除较大的文件。除了删除文件外，所有这些都有效。当我尝试时，它会抛出一个错误，指出文件正在使用中。经过一番研究，我了解到这是因为我在代码中打开了文件，防止它们被删除。我的问题是我不知道我需要关闭什么变量，或者关闭的适当方式和位置。

import os
import cv2
import PTN
import json

array1 = [os.path.join(r,file) for r,d,f in os.walk("E:\Python Test Environment") for file in f]

for x in range(0, len(array1)):
    print(array1[x])

array2 = array1[:] #The colon tells it to directly copy rather than do a link

for x in range(0, len(array2)):
    array2[x] = (json.dumps(PTN.parse(array2[x])))
    array2[x] = json.loads(array2[x])['title']
    head, array2[x] = os.path.split(array2[x])
    del head

y = len(array2)

for x in range(0, len(array2)):
    if array2[x] == "":
        break

    for i in range(x, y-1): #Set to x+1 so that it does not compare against the current file
        i = x + 1

        if array2[i] == "":
            break

        if array2[x] == array2[i]:
            print 'Match found!'
            print array1[i]
            print 'Matches: '
            print array1[x]

            with open(array1[x]) as f: #tried to include this to prevent error, doesn't seem to stop it
                capture1 = cv2.VideoCapture(array1[x]) #Open the video
                ret, frame = capture1.read() #Read the first frame
                resolution1 = frame.shape #Get resolution
                f.close()

            with open(array1[i]) as f: #tried to include this to prevent error, doesn't seem to stop it
                capture2 = cv2.VideoCapture(array1[i]) #Open the video
                ret, frame = capture2.read() #Read the first frame
                resolution2 = frame.shape #Get resolution
                f.close()

            if resolution1 > resolution2:
                print array1[x]
                print "Is higher resolution than"
                print array1[i]
                print "Would delete: "
                print array1[i]
                os.remove(array1[i])
                array1[i] = ""
                array2[i] = ""

            if resolution2 > resolution1:
                print array1[i]
                print "Is higher resolution than"
                print array1[x]
                print "Would delete: "
                print array1[i]
                os.remove(array1[x])
                array1[x] = ""
                array2[x] = ""

            if resolution1 == resolution2:
                print "equal"
                if os.path.getsize(array1[x]) <= os.path.getsize(array1[i]):
                    print "Would delete: "
                    print array1[i]
                    os.remove(array1[i])
                    array1[i] = ""
                    array2[i] = ""

                if os.path.getsize(array1[i]) < os.path.getsize(array1[x]):
                print "Would delete: "
                print array1[x]
                os.remove(array1[x])
                array1[x] = ""
                array2[x] = ""

Answer 1

添加 capture1.release() 和 capture2.release() 以释放 VideoCapture 个实例使用的资源

使用 cv2 时关闭 Python 个文件

Closing Python files while using cv2

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