Question

那是我的代码

def report_one_friend(self):

filename = QFileDialog.getSaveFileName(self, "", "cars.xlsx","Excel(.xlsx)")

if filename:
    openFile = open(filename, 'r').read()
    self.plainTextEdit.appendPlainText(openFile)



wb = xlsxwriter.Workbook(filename[0])
sheet1 = wb.add_worksheet()
sql = '''SELECT * FROM ahmed WHERE mth_search = %s'''
mth_search = self.lineEdit_3.text()
c = self.conn.cursor()
c.execute(sql, [(mth_search)])
data = c.fetchall()
for row in data:
    print(row)
    sheet1.write(0,2,'الاسم')
    sheet1.write(0,0,row[1])

    sheet1.write(1, 2, 'الرقم')
    sheet1.write(1, 0, row[2])

wb.close()

这给了我一个错误：

 Connected to MySQL database using C extension... MySQL Server version on  8.0.12
    Traceback (most recent call last):
      File "/Users/mahmoudtarek/Desktop/mth1/index.py", line 174, in mth_friends
        self.report_one_friend()
      File "/Users/mahmoudtarek/Desktop/mth1/index.py", line 208, in report_one_friend
        openFile = open(filename, 'r').read()
    TypeError: expected str, bytes or os.PathLike object, not tuple

Answer 1

您会看到“所选文件”和“应用的过滤器”的元组。

最小代码示例：

from PyQt5.Qt import *
app = QApplication([])
print(QFileDialog.getSaveFileName())

选择“某些文件”： ('C:/scratches/scratch.py', 'All Files (*)')

但是当您不选择某些内容并取消对话框时，则两个字符串为空：('', '')。
由于其中有两个字符串的元组为true，因此您尝试使用此文件open()来创建文件，这会导致错误。

解决方案：
将元组解压缩为两个变量或使用index [0]，如下所示：

filename, filter = QFileDialog.getSaveFileName(self, "", "cars.xlsx","Excel(.xlsx)")
if filename:
    openFile = open(filename, 'r').read()
    ...

为什么取消qfiledialog出错？

1 个答案: