Python file() function
Solution 1
In Python 2, open
and file
are mostly equivalent. file
is the type and open
is a function with a slightly friendlier name; both take the same arguments and do the same thing when called, but calling file
to create files is discouraged and trying to do type checks with isinstance(thing, open)
doesn't work.
In Python 3, the file implementation in the io
module is the default, and the file
type in the builtin namespace is gone. open
still works, and is what you should use.
Solution 2
You can do what the documentation for file()
suggests -
When opening a file, it’s preferable to use
open()
instead of invoking this constructor directly.
You should use open()
method instead.
Bernardo Meurer
I'm a 15 16 17 18 19 20 21 22 23 year old high school university student Software Engineer living in Rio, Brazil Lisbon, Portugal Santa Barbara San Francisco. I work at Standard Cognition Google Quantum where I help build QKernel and QCC.
Updated on June 19, 2022Comments
-
Bernardo Meurer almost 2 years
I've been adapting an old piece of code to be Python 3 compliant and I came across this individual script
"""Utility functions for processing images for delivery to Tesseract""" import os def image_to_scratch(im, scratch_image_name): """Saves image in memory to scratch file. .bmp format will be read correctly by Tesseract""" im.save(scratch_image_name, dpi=(200, 200)) def retrieve_text(scratch_text_name_root): inf = file(scratch_text_name_root + '.txt') text = inf.read() inf.close() return text def perform_cleanup(scratch_image_name, scratch_text_name_root): """Clean up temporary files from disk""" for name in (scratch_image_name, scratch_text_name_root + '.txt', "tesseract.log"): try: os.remove(name) except OSError: pass
On the second function,
retrieve_text
the first line fails with:Traceback (most recent call last): File ".\anpr.py", line 15, in <module> text = image_to_string(Img) File "C:\Users\berna\Documents\GitHub\Python-ANPR\pytesser.py", line 35, in image_to_string text = util.retrieve_text(scratch_text_name_root) File "C:\Users\berna\Documents\GitHub\Python-ANPR\util.py", line 10, in retrieve_text inf = file(scratch_text_name_root + '.txt') NameError: name 'file' is not defined
Is this a deprecated function or another problem alltogether? Should I be replacing
file()
with something likeopen()
? -
Bernardo Meurer over 8 yearsJust replaced it for
inf = open(scratch_text_name_root + '.txt', 'r')
, working nicely now :)