Python如何同时读写一个文件
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Python how can read and write a file at same time
提问by Carl
f = open("test.txt",'r+')
print f.read();
f.write('\n\nI am carl wei.')
print f.read();
f.close()
but it's has a eeror:
但它有一个错误：
Traceback (most recent call last):
File "C:\Users\carl.wei\workspace\Python\FileTest.py", line 9, in f.write('\n\nI am carl wei.') IOError: [Errno 0] Error
回溯（最近一次调用）：
文件“C:\Users\carl.wei\workspace\Python\FileTest.py”，第 9 行，在 f.write('\n\nI am carl wei.') IOError: [错误 0] 错误
回答by Prelude
I don't know I got your question or not, but if you want to read a file and write it at the same time, you may like to check out This
我不知道我有没有收到你的问题，但如果你想同时读一个文件和写它，你可能想看看这个
But from my experience if you use the same file to write and read datas all the data will be erased and that might be trouble some in future, ergo you can simply make another file in the same directory and have some code like this:
但是根据我的经验，如果您使用相同的文件来写入和读取数据，所有数据都将被删除，这在将来可能会带来麻烦，因此您可以简单地在同一目录中创建另一个文件并使用如下代码：
original_file= open('test.txt','r')# r when we only wanna read file
revised_file = open('test1.txt','w')# w when u wanna write sth on the file
for aline in original_file:
revised_file.write('I am carl wei.\n' )#for writing your new data
original_file.close()
revised_file.close()
