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File reading modes

with open(filename, mode) as f:
	data = f.read()

Modes:

String	Description
'r'	for reading text
'w'	for writing
'a'	for writing, will append to the file

These basic commands can be extended with:

'+'	Allows for both reading and writing. However note, that the differences between 'r' and 'w' are kept, 'w+' still, deletes all content of the file, while 'r+' does not.
'b'	Binary mode: Opens or writes in binary mode. Essential, if the file contents are not characters.

As an example, in the Pickling, saving objects to disk, you see that we use 'wb' to pickle an object. We only write, therefore 'w', and we might write non string data, so the binary extension: 'wb'

Read line by line

Assuming it is a text file:

with open(filename, 'r') as f:
	lines = f.readlines()
	for line in lines:
		line = line.strip()
		# process each line