WindowsError:[错误32]该进程无法访问文件，因为该文件正在被另一个进程使用:"new.dat" [英] WindowsError: [Error 32] The process cannot access the file because it is being used by another process: 'new.dat'
问题描述
以下是我的整个程序..我只是不知道我在做错什么 它一直在告诉该进程正在被其他文件使用...我只是不明白 请帮帮我，因为我需要在两天内提交
the below is my entire program .. i just don't know were am I going wrong it keeps on telling that the process is eing used by some other file ...I just don't understand please help me out as I need to submit this within two days time
import os
import pickle
password=123
l=input("Enter Password :")
if l==password:
print"--------Welcome Admin--------"
class new:
def __init__(self,a,b,c):
self.acno=a
self.acna=b
self.ini=c
def display(self):
print self.acno,self.acna,self.ini
def form(): # creating new account holders
print" ---New Account Entry Form--- "
n=input("Enter the no. Forms")
f1=open("new.dat","ab")
for i in range (n):
a=input("Enter The Account No:")
b=raw_input("Enter The Name of The Account Holder:")
c=input("Enter The Initial Amount (>=5000 ):")
if c<5000:
print "Initial Amount Too Low"
c=input("Enter The Initial Amount (>=5000 ):")
e=new(a,b,c)
pickle.dump(e,f1)
f1.close()
print"--------Account Created Successfully--------------"
def depo():#depositing amount in the account
print" ---- Account Deposition Form ---- "
p=input("Enter the Account Number:")
f1=open("new.dat","rb")
f2=open("dep.dat","wb")
amt=input("Enter the Amount to Deposit :")
try:
while True:
s=pickle.load(f1)
if s.acno==p:
s.ini+=amt
pickle.dump(s,f2)
except EOFError:
f1.close()
f2.close()
print"Amount Deposited Successfully"
os.remove("new.dat")
os.rename("dep.dat","new.dat")
def withdraw():#to withdraw
print " Account Transaction Form "
p=input("enter the account n:")
f2=open("new.dat","rb")
f3=open("f2.dat","wb")
amt=input("Enter the amount to Withdraw:")
try:
while True:
s=pickle.load(f2)
if s.acno==p:
if s.ini>amt or s.ini==amt :
s.ini-=amt
pickle.dump(s,f3)
print "Amount Withdrawed"
elif s.ini<amt:
print "No sufficient balance "
else:
print " Account no. invalid"
except EOFError:
f2.close()
f3.close()
os.remove("new.dat")
os.rename("f2.dat","new.dat")
def balance():#check the balance
print" Balance Amount Details"
p=input("Enter the Account Number:")
f3=open("new.dat","rb")
try:
while True:
s=pickle.load(f3)
if s.acno==p:
print "the Balance Amount for Acc. no. ",p,"is :", s.ini
except EOFError:
f3.close()
def displa():#display all the account holders
print " All Account Holders List "
f1=open("new.dat","rb")
try :
while True:
k=pickle.load(f1)
k.display()
except EOFError:
f1.close()
def dele(): # to delete the account holder error here
print " Account Deletion Form"
f1=open("new.dat","rb")
f2=open("tnew.dat","wb")
try:
e=pickle.load(f1)
no=input("Enter the Account No:")
if e.acno!=no:
pickle.dump(e,f2)
except EOFError:
f2.close()
f1.close()
os.remove("new.dat") #error here
os.rename("tnew.dat","new.dat") # error here
f1.close()
while True:
print"-----------------------------------------------------------------------------------------------------------------"
print" Bank Management System"
print" "
print"---Main Menu--- :"
print"1. New account"
print"2. Deposit amount"
print"3. Withdraw amount"
print"4. Balance account"
print"5. All Account Holders List "
print"6. Close An Account"
print"7. Exit"
choice=input("Enter Your Option (1-7):")
if choice==1:
form()
elif choice==2:
depo()
elif choice==3:
withdraw()
elif choice==4:
balance()
elif choice==5:
displa()
elif choice==6:
dele()
else:
print "-------Login In Later----------"
break
else:
print "PASSWORD Incorrect"
推荐答案
尝试先f1=open("new.dat","rb")然后os.remove("new.dat")而不先关闭它；您无法删除它，并且会发生错误，因为该文件处于另一个进程"下，换句话说，它正在读取中
Try to f1=open("new.dat","rb") and then os.remove("new.dat") without closing it first; You cannot delete it and the error occures because the file is under 'another process', in other words it's under reading
您永远不要使用f = open(filename, 'x')打开文件，然后使用f.close()关闭文件，如果由于某种原因该程序不执行关闭操作，它可能会产生与您完全相同的问题...
You shouldn't ever open the file with f = open(filename, 'x') and then close with f.close(), it might create problems exactly like yours if for some reason the program doesn't execute the closure...
相反，尝试使用with open(filename, 'x') as f:重写您的函数，当其中的代码运行完毕或出现错误而程序不受影响时，它将自动关闭文件
Instead, try to rewrite your functions using with open(filename, 'x') as f:, it automatically closes the file when the code within has finished to run or on error without the program being affected
http://effbot.org/zone/python-with-statement.htm
否则，如果您不想弄乱一切
(请注意，如果没有发生错误，您的函数将使文件保持打开状态)，
尝试用finally:更改每个except EOFError:块，最后，该块与使用with相同.
Otherwise, if you don't want to mess everything up
(note that your functions keep the the files open if error doesn't occur),
try to change every except EOFError: block with finally:, which, at the end, is the same as using with.
来源:
"try-finally结构保证
finally部分下的代码 即使执行工作的代码无法执行，也始终会执行 完成."
"The try-finally construct guarantees that the code under the
finallypart is always executed, even if the code that does the work doesn’t finish."
这应该确保关闭
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