Question

我已经在python中为tkinter GUI编写了一个函数，如下所示：

def mgpd():
answer = filedialog.askdirectory(parent=root,
                                 initialdir=os.getcwd(),
                                 title="Please select a folder:")
if len(answer) > 2:
    with open("output.pdf", "wb") as f:
        f.write(img2pdf.convert([i for i in os.listdir(answer) if i.endswith(".jpg")]))
else:
    pass
t2.delete(0, 'end')
t2.insert('insert', 'task completed.')

现在，当我选择一个文件夹时，类型错误将显示为TypeError: a bytes-like object is required, not 'str'。我猜是endswith周围的问题。

Answer 1

Python抱怨类字节对象通常是因为您要更改的任何字符串都已编码。尝试使用if i.endswith(".jpg")]代替if i.decode().endswith(".jpg")]。

Answer 2

最后，这就是答案：

def mgpd():
image_files = []
answer = filedialog.askdirectory(parent=root,
                                 initialdir=os.getcwd(),
                                 title="Please select a folder:")
if len(answer) > 2:
    for file in os.listdir(answer):
        if file.endswith(".jpg"):
            image_files.append(os.path.join(answer, file))
        else:
            pass

outfile = os.path.join(answer, 'output.pdf')
pdf_bytes = img2pdf.convert(image_files)
file = open(outfile, "wb")
file.write(pdf_bytes)

t2.delete(0, 'end')
t2.insert('insert', 'task completed.')

选择文件夹以在tkinter

2 个答案: