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Text File Basics
To demonstrate, let’s begin with basic file I/O. As long as you’re processing basic text files (e.g., ASCII) and don’t care about circumventing the platform-default encoding of strings, files in 3.0 look and feel much as they do in 2.X (for that matter, so do strings in general). The following, for instance, writes one line of text to a file and reads it back in 3.0, exactly as it would in 2.6 (note that file is no longer a built-in name in 3.0, so it’s perfectly OK to use it as a variable here):
C:\misc> c:\python30\python
# Basic text files (and strings) work the same as in 2.X
>>> file = open('temp', 'w')
>>> size = file.write('abc\n') # Returns number of bytes written
>>> file.close() # Manual close to flush output buffer
>>> file = open('temp') # Default mode is "r" (== "rt"): text input
>>> text = file.read()
>>> text
'abc\n'
>>> print(text)
abc
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