safer 0.9.4

Try to import all modules below a given root

Safely write or print to a file, leaving it unchanged if something goes wrong.

Example:

import safer

with safer.writer(filename) as fp:
    for line in source():
       fp.write('this and that')

with safer.printer(filename) as print:
    print('this', 'and', 'that')
    print('two', 'lines', sep='\n')
    # ...

Writes occur on a temporary file, which is only copied over the original file when the block completes successfully, so safer will temporarily use as much disk space as the old file and the new file put together.

This is great for writing any files which you don’t want to get partially overwritten if something goes wrong in the writing process.