Python UnboundLocalError：局部变量'；完整文件名'；分配前参考

我面临的错误如下：

UnboundLocalError: local variable 'fullfilename' referenced before assignment

代码块：

caminho_path = self.tempDir
arquivos = os.listdir(self.tempDir)

for arquivo in arquivos:
    if arquivo.endswith(".zip"):
        fullfilename = os.path.join(caminho_path, arquivo)

self.driver.implicitly_wait(5)

sleep(10)

with ZipFile(fullfilename, 'r') as zipObj:
    listOfFileNames = zipObj.namelist()
    for fileName in listOfFileNames:
        if fileName.endswith('.csv'):
            zipObj.extract(fileName, self.tempDir)
            print('unzip' + str(fileName))

for arquivo in arquivos:
    if arquivo.endswith(".zip"):
        fullfilename = os.path.join(caminho_path, arquivo)

错误：

File "path...", line 166, in ...

    with ZipFile(fullfilename, 'r') as zipObj:
UnboundLocalError: local variable 'fullfilename' referenced before assignment

此错误消息

UnboundLocalError: local variable 'fullfilename' referenced before assignment

…意味着您已经引用了变量

fullfilename

，甚至在它被赋值之前

---

在代码块中：

caminho_path = self.tempDir
arquivos = os.listdir(self.tempDir)

for arquivo in arquivos:
    if arquivo.endswith(".zip"):
        fullfilename = os.path.join(caminho_path, arquivo)

self.driver.implicitly_wait(5)

sleep(10)

with ZipFile(fullfilename, 'r') as zipObj:
    listOfFileNames = zipObj.namelist()
    for fileName in listOfFileNames:
        if fileName.endswith('.csv'):
            zipObj.extract(fileName, self.tempDir)
            print('unzip' + str(fileName))

for arquivo in arquivos:
    if arquivo.endswith(".zip"):
        fullfilename = os.path.join(caminho_path, arquivo)

只有当条件

arquivo.endswith（“.zip”）

为

true

时，才会为变量

fullfilename

赋值。否则变量

fullfilename

将保持未分配状态

在其中一种情况下，当变量未赋值时，您尝试在代码的后面部分引用它，如下所示：

with ZipFile(fullfilename, 'r') as zipObj:

---

即使变量

fullfilename

仍然未赋值。因此，您会看到错误。

仅当if语句为true时才设置变量，但无论if语句如何，您稍后都会尝试使用它。因此，如果is语句为false，则不会设置变量，因此当您稍后尝试使用它时，会出现错误