我是。泡菜一个接一个地加载两个文件，我在关闭它们时遇到了未绑定的本地错误。 我在打开文件时使用了异常处理，在except块中，关闭文件时显示了未绑定的本地错误。 尽管我在异常块中使用了filenotfound，因为它是处理异常的必要异常。没有缩进错误，我只是无法处理错误说明。
"Traceback (most recent call last):
File "d:\Python\t.py", line 648, in dispdeisel
fdl=open("D:/Python/deisel/"+str(z1)+".txt","rb+")
FileNotFoundError: [Errno 2] No such file or directory: 'D:/Python/deisel/Wed Apr 29 2020.txt'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "d:\Python\t.py", line 820, in <module>
b.dispdeisel()
File "d:\Python\t.py", line 664, in dispdeisel
fdl.close()
UnboundLocalError: local variable 'fdl' referenced before assignment"
k1=[]
try:
tdc=open("D:/Python/deisel/collection.txt","rb+")
fdl=open("D:/Python/deisel/"+str(z1)+".txt","rb+")
while True:
self.f1=pickle.load(tdc)
self.fd=pickle.load(fdl)
k1.append(self.f1)
kd.append(self.fd)
except EOFError and FileNotFoundError:
qa=0
for i in kd:
if "L"in i:
qa1=i[:-1]
qa=qa+int(qa)
else:
qa=qa+int(i[0])
print (" Total Collection for Deisel on date ",z1,"is",qa)
tdc.close()
fdl.close()
答案 0 :(得分：0)
在您的示例代码中，到达此行（并导致错误）时：
b'aaaaaaaaaaaaaaaaaaaaaaaaaa' 59
b'x\x9cKL\xc4\x05\x00\x85\x19\t\xdb' 44
b'aaaaaaaaaaaaaaaaaaaaaaaaaa' 59
..那么下一行将永远不会执行，并且tdc=open("D:/Python/deisel/collection.txt","rb+")
将没有值。
出现错误后，在fdl之后继续执行，并到达以下行：
except EOFError and FileNotFoundError:由于从未定义fdl.close()
（因为跳过了该行），因此它没有任何值，这就是导致错误的原因。
一种解决方法是更干净地处理异常：
fdl这是更好的方法，但不是Python风格，仅说明了如何解决问题-根本不建议您编写此方法。
更贴近您的需求
class SomeClass:
def some_method(self, z1):
# initialisation
qa = 0
kd = []
k1 = []
try:
tdc = open("D:/Python/deisel/collection.txt","rb+")
try:
fdl = open("D:/Python/deisel/"+str(z1)+".txt","rb+")
try:
try:
while True:
self.f1 = pickle.load(tdc)
self.fd = pickle.load(fdl)
k1.append(self.f1)
kd.append(self.fd)
except EOFError:
pass # no message needed, but not the nicest way to use the exception
for i in kd:
if "L" in i:
# this bit makes no sense to me, but it's not relevant
qa1 = i[:-1]
qa = qa + int(qa)
else:
qa = qa + int(i[0])
print(" Total Collection for Deisel on date ", z1, "is", qa)
finally:
tdc.close()
fdl.close()
except FileNotFoundError:
tdc.close() # this is open, closing it
pass # some error message perhaps?
except FileNotFoundError:
pass # some error message perhaps?
import pickle
class SomeClass:
def some_method(self, z1):
# initialisation
qa = 0
kd = []
k1 = []
try:
with open("D:/Python/deisel/collection.txt","rb+") as tdc:
try:
with open("D:/Python/deisel/"+str(z1)+".txt","rb+") as fdl:
try:
while True:
self.f1 = pickle.load(tdc)
self.fd = pickle.load(fdl)
k1.append(self.f1)
kd.append(self.fd)
except EOFError:
pass # no message needed, but not the nicest way to use the exception
for i in kd:
if "L" in i:
# this bit makes no sense to me, but it's not relevant
qa1 = i[:-1]
qa = qa + int(qa)
else:
qa = qa + int(i[0])
print(" Total Collection for Deisel on date ", z1, "is", qa)
except FileNotFoundError:
pass # some error message perhaps?
except FileNotFoundError:
pass # some error message perhaps?
完全按照您的意图进行操作，并保证清理文件句柄。
这仍然存在从文件中获取多个泡菜的问题，但不能保证两个泡菜的数量都相同-如果您自己编写这些泡菜，为什么不泡菜的对象列表并避免这种混乱呢？ / p>
通常，如果您期望发生异常，请不要使用异常，而应直接根据您的期望进行编码-易于阅读和维护，并且通常表现更好：
with我不知道其余的代码，但是如果您以一种可预测的方式进行腌制，并且看来{{1} }}仅用于限制从import pickle
from pathlib import Path
class SomeClass:
def some_method(self, z1):
# initialisation
qa = 0
kd = []
k1 = []
fn1 = "D:/Python/deisel/collection.txt"
fn2 = "D:/Python/deisel/"+str(z1)+".txt"
if not Path(fn1).is_file() or not Path(fn2).is_file():
return # some error message perhaps?
with open(fn1, "rb+") as tdc:
with open(fn2, "rb+") as fdl:
try:
while True:
# not using self.f1 and .fd, since it seems they are just local
# also: why are you loading k1 anyway, you're not using it?
k1.append(pickle.load(tdc))
kd.append(pickle.load(fdl))
except EOFError:
pass # no message needed, but not the nicest way to use the exception
for i in kd:
if "L" in i:
qa1 = i[:-1]
qa = qa + int(qa)
else:
qa = qa + int(i[0])
print(" Total Collection for Deisel on date ", z1, "is", qa)
加载多少个元素的目的，这很浪费。
请注意，在每个示例中，代码如何变得更具可读性和更短。短一点本身不是一件好事，但是，如果您的代码变得更易于阅读和理解，更好地执行并且在顶部更短，则表示您处在正确的轨道上。