字符串不会写入文件

Question

I have a code which I am writing 'testing' into, once the file is done I was hoping to see 'testing' in the text file but it is still empty. Am I missing something here?

import shutil
import sys
f = open('test.txt', 'r+')
f.write('testing')
shutil.copyfileobj(f, sys.stdout)

Answer 1

It is actually correct, the problem is that when you write , the buffer pointer moves, so when you copy, it won't print anything. Try with seek before like this:

import shutil
import sys
f = open('test.txt', 'r+')
f.write('testing')
f.seek(0)
shutil.copyfileobj(f, sys.stdout)

Hope this helps!

Answer 2

you need to close the file.

f.close()

EDIT

try changing the name of the file, Is it still not writting:

f = open('test124.txt', 'a') # use the append flag so that it creates the file. 
f.write('testing')
f.close()