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Python file handling - writing

Go to the [[Python Week 4 Main Page]] or the [[Python - Main Page]] Also see the [[Programming Main Page]] or the [[Main AI Page]]

See [[Python file handling - reading]]

For code examples see [[Week4 Writing to Files Lab]]

Using 'w' mode

This time we use w for write mode.

with open("/resources/data/Example2.txt", "w") as File1:
	File1.write("This is line A")

This will write This is line A to the first line of the file, overwriting whatever was there before.

Successive calls of .write() will write to a new line in the file.

Using 'a' mode

Using a mode will append lines to the end of an existing file.

It is also common to use for loops to add list or dictionary elements to a file.

with open("/resources/data/Example2.txt", "a") as File1:
	for item in source_list:

Nesting files

You can nest file context managers to perform functions such as copying the contents of one file to another. See the graphic below.

Nesting file open context managers to copy file contents

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