aws Al-Aisafa wrote:
> Why doesn't this code work?
> #I want this code to write to the first file and then take the
> #contents of the first file and copy them to the second.
>
> from sys import argv
>
> script, file1, file2 = argv
>
>
> def write_to_file(fileread, filewrite):
> '''Writes to a file '''
> filewrite.write(fileread)
>
>
> input_file = open(file1, 'r+w')
> output_file = open(file2, 'w')
>
> datain = raw_input(">")
> input_file.write(datain)
>
> print input_file.read()
>
> write_to_file(input_file.read(), output_file)
> create a new version of this paste
> http://pastebin.com/A3Sf9WPu
> input_file.write(datain)
The file cursor is now positioned after the data you have just written. Then
you read all data in the file *after* that data. As there is not data (you
have reached the end of the file) the following prints the empty string:
> print input_file.read()
One way to fix this is to move the file pointer back to the beginning of the
file with
input_file.seek(0)
so that a subsequent
input_file.read()
will return the complete contents of the file.
For the simple example it would of course be sufficient to reuse datain:
write_to_file(datain, output_file)
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