How to creat a file?

[sandorf]

I'm new to python. Have a simple question.

"open" function can only open an existing file and raise a IOerror when
the given file does not exist. How can I creat a new file then?

[Laurent RAHUEL]

sandorf wrote:

I'm new to python. Have a simple question.

"open" function can only open an existing file and raise a IOerror when
the given file does not exist. How can I creat a new file then?

fic = open('test.txt', 'w')
fic.write('Hello world')
fic.close()

[Wolfram Kraus]

sandorf wrote:

I'm new to python. Have a simple question.

"open" function can only open an existing file and raise a IOerror when
the given file does not exist. How can I creat a new file then?

open the new file in write mode: open('foo', 'w')
See: help(open)

HTH,
Wolfram

[Juho Schultz]

sandorf wrote:

I'm new to python. Have a simple question.

"open" function can only open an existing file and raise a IOerror when
the given file does not exist. How can I creat a new file then?

You already have two correct answers. A warning: if you open a existing
file for writing, it is truncated (the old contents of that file
disappear.) For adding new content to the end of an existing file,
you can use:

f = open(filename,'a')

[Fredrik Lundh]

"sandorf" <fa*********@gmail.com> wrote:

I'm new to python. Have a simple question.

"open" function can only open an existing file and raise a IOerror when
the given file does not exist. How can I creat a new file then?

reading the documentation might help:

help(open)

class file(object)
| file(name[, mode[, buffering]]) -> file object
|
| Open a file. The mode can be 'r', 'w' or 'a' for reading (default),
| writing or appending. The file will be created if it doesn't exist
| when opened for writing or appending; it will be truncated when
| opened for writing. Add a 'b' to the mode for binary files.
| Add a '+' to the mode to allow simultaneous reading and writing.

/snip/

| Note: open() is an alias for file().

this is also explained in the chapter 7 of the tutorial ("reading and writing files"),
as well as the reference manual.

</F>

[sandorf]

Thank to you all, guys. Here's another question:

I'm using the Windows version of Python and IDLE. When I debug my .py
file, my modification to the .py file does not seem to take effect
unless I restart IDLE. Saving the file and re-importing it doesn't help
either. Where's the problem?

[mensanator]

sandorf wrote:

Thank to you all, guys. Here's another question:

I'm using the Windows version of Python and IDLE. When I debug my .py
file, my modification to the .py file does not seem to take effect
unless I restart IDLE. Saving the file and re-importing it doesn't help
either. Where's the problem? From your edit window, go to the Run menu and select Run Module.

It will prompt you to save the file, it will restart the shell and will
reload
and run the new version all in one operation.