有没有办法关闭文件PdfFileReader打开？

Question

我打开了很多PDF，我希望在解析后删除PDF文件，但文件在程序运行完毕之前一直保持打开状态。 如何关闭我使用PyPDF2打开的PDf？

码：

def getPDFContent(path):
    content = ""
    # Load PDF into pyPDF
    pdf = PyPDF2.PdfFileReader(file(path, "rb"))

    #Check for number of pages, prevents out of bounds errors
    max = 0
    if pdf.numPages > 3:
        max = 3
    else:
        max = (pdf.numPages - 1)

    # Iterate pages
    for i in range(0, max): 
        # Extract text from page and add to content
        content += pdf.getPage(i).extractText() + "\n"
    # Collapse whitespace
    content = " ".join(content.replace(u"\xa0", " ").strip().split())
    #pdf.close()
    return content

Answer 1

只需自己打开和关闭文件

f = open(path, "rb")
pdf = PyPDF2.PdfFileReader(f)
f.close()

PyPDF2 .read()是你在构造函数中传入的流。 所以在初始对象构造之后，你可以抛出文件。

上下文管理器也可以工作：

with open(path, "rb") as f:
    pdf = PyPDF2.PdfFileReader(f)
do_other_stuff_with_pdf(pdf)

Answer 2

这样做时：

pdf = PyPDF2.PdfFileReader(file(path, "rb"))

您正在尝试对句柄的引用，但您无法控制文件何时关闭。

您应该使用句柄创建上下文，而不是从此处匿名传递它：

我会写的

with open(path,"rb") as f:

    pdf = PyPDF2.PdfFileReader(f)
    #Check for number of pages, prevents out of bounds errors
    ... do your processing
    # Collapse whitespace
    content = " ".join(content.replace(u"\xa0", " ").strip().split())
# now the file is closed by exiting the block, you can delete it
os.remove(path)
# and return the contents
return content

Answer 3

是的，您正在将流传递给PdfFileReader，您可以将其关闭。 with语法最适合您：

def getPDFContent(path):
    with open(path, "rb") as f:
        content = ""
        # Load PDF into pyPDF
        pdf = PyPDF2.PdfFileReader(f)

        #Check for number of pages, prevents out of bounds errors
        max = 0
        if pdf.numPages > 3:
            max = 3
        else:
            max = (pdf.numPages - 1)

        # Iterate pages
        for i in range(0, max): 
            # Extract text from page and add to content
            content += pdf.getPage(i).extractText() + "\n"
        # Collapse whitespace
        content = " ".join(content.replace(u"\xa0", " ").strip().split())
        return content