Unable to write into files
Question: This is a bit strange. My program isn't able to write the output to a file.
Its even not showing any error. I simultaneously used standard output and
found that its showing..

This is my code: (Python 2.7)

    
    
    #!/usr/bin/env python
    
    
    import re
    
    def isRecycled(n,m):
        n = str(n)
        m = str(m)
    
        try:
            ...........
            ...........
            My Code.
    
        except ValueError:
            return False
    
    ip = open("C-small-attempt0.in", "r")
    op = open("output.txt", "a")
    for num, eachLine in enumerate( ip.readlines()[1:] ):
        ......
        ......
        My code
    
        ## This is WORKING
        print "Case #%d: %d" %(num+1, count)
    
        ## This is NOT Working
        op.write("Case #%d: %d" %(num+1, count))
    

Can anyone tell me why this is not writing to the file.

I tried to use `"w+"`, `"w"` modes and also `writelines()` method but they
didn't work.

**Edited**

However, it worked when I closed the file using `op.close()`

  1. Why this is happening? (I didn't encounter it previously)
  2. Does python immediately write to the file as soon as it finds `op.write()`?


Answer: You need to close the file for it to write to disk. Add op.close() to the end
of your code.

