我得到一个有趣的错误，而试图使用Unpickler.load()，这是源代码:
open(target, 'a').close()
scores = {};
with open(target, "rb") as file:
unpickler = pickle.Unpickler(file);
scores = unpickler.load();
if not isinstance(scores, dict):
scores = {};
下面是回溯:
Traceback (most recent call last):
File "G:\python\pendu\user_test.py", line 3, in <module>:
save_user_points("Magix", 30);
File "G:\python\pendu\user.py", line 22, in save_user_points:
scores = unpickler.load();
EOFError: Ran out of input
我正在读取的文件是空的。
我如何避免得到这个错误，并得到一个空变量代替?
from os.path import getsize as size
from pickle import *
if size(target)>0:
with open(target,'rb') as f:
scores={i:j for i,j in enumerate(load(f))}
else: scores={}
#line 1.
we importing Function 'getsize' from Library 'OS' sublibrary 'path' and we rename it with command 'as' for shorter style of writing. Important is hier that we loading only one single Func that we need and not whole Library!
line 2.
Same Idea, but when we dont know wich modul we will use in code at the begining, we can import all library using a command '*'.
line 3.
Conditional Statement... if size of your file >0 ( means obj is not an empty). 'target' is variable that schould be a bit earlier predefined.
just an Example : target=(r'd:\dir1\dir.2..\YourDataFile.bin')
Line 4.
'With open(target) as file:' an open construction for any file, u dont need then to use file.close(). it helps to avoid some typical Errors such as "Run out of input" or Permissions rights.
'rb' mod means 'rea binary' that u can only read(load) the data from your binary file but u cant modify/rewrite it.
Line5.
List comprehension method in applying to a Dictionary..
line 6. Case your datafile is empty, it will not raise an any Error msg, but return just an empty dictionary.
