And write is responsible for writing into the file from the cursor position. write doesn't care about after writing a file is there any content remain or not. truncate here do the job to remove the rest of the content from the cursor position of the file. –

Basically, I think it's a bug in the json.dump() function in Python 2 only - It can't dump a Python (dictionary / list) data containing non-ASCII characters, even you open the file with the encoding = 'utf-8' parameter. (i.e.

May 28, 2011 · from __future__ import print_function # Only needed for Python 2 print("hi there", file=f) For Python 3 you don't need the import , since the print() function is the default. The alternative in Python 3 would be to use:

May 18, 2011 · Writing Unicode text to a text file? In Python 2, use open from the io module (this is the same as the builtin open in Python 3): import io Best practice, in general, use UTF-8 for writing to files (we don't even have to worry about byte-order with utf-8). encoding = 'utf-8'

It Opens file for reading. 'w' This Mode Opens file for writing. If file does not exist, it creates a new file. If file exists it truncates the file. 'x' Creates a new file. If file already exists, the operation fails. 'a' Open file in append mode. If file does not exist, it creates a new file. 't' This is the default mode.

Nov 16, 2012 · I've been having trouble with this for a while. How do I open a file in python and continue writing to it but not overwriting what I had written before? For instance: The code below will write 'output is OK'. Then the next few lines will overwrite it and it will just be 'DONE' But I want both 'output is OK' 'DONE' in the file

Dec 2, 2013 · In Python file objects are context managers which means they can be used with a with statement so you could do the same thing a little more succinctly with the following which will close the file automatically.

May 12, 2011 · Due to buffering, the string may not actually show up in the file until you call flush() or close(). So try to call f.close() after f.write(). Also using with with file objects is recommended, it will automatically close the file for you even if you break out of the with block early due to an exception or return statement.

Feb 2, 2023 · Python is not writing to a file for some reason. 0. File is created but cannot be written in Python. 2 ...

When you open a file in binary mode, then you are essentially working with the bytes type. So when you write to the file, you need to pass a bytes object, and when you read from it, you get a bytes object. In contrast, when opening the file in text mode, you are working with str objects. So, writing “binary” is really writing a bytes string: