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Saturday, October 31, 2009

A workaround solution to python str/repr issue

Remember my post about the python __str__ issue? A couple of people asked me if I had any simple patch/workaround for it. Here is a small function that you can use to work around the problem (click on the Show code to see the solution):

Click here to show the code

def my_str(item):
    """
    This is an implementation to fix a bug with __str__ function implemenation for lists and tuples in python.

    Example:
        print my_str([1L, {1:2L, 'aa':4L}])
    """
    if type(item) is str:
        return item
    else:
        return rec_my_str(item)

def rec_my_str(item):
    if type(item) is str:
        return repr(item)
    elif type(item) not in [list, tuple, dict]:
        return str(item)
    else:
        s = ''
        for i in item:
            if type(item) is dict:
                s += ',%s:%s' % (rec_my_str(i), rec_my_str(item[i]))
            else:
                s += ',%s' % (rec_my_str(i))
        if len(s) > 0:
            s = s[1:]
        if type(item) is dict:
            return '{%s}' % (s)
        if type(item) is list:
            return '[%s]' % (s)
        else:
            return '(%s)' % (s)

Here is a nice example of the solution:

  >>> from decimal import Decimal
  >>> from datetime import datetime
  >>> str([Decimal('42'), datetime.now()])
  '[Decimal("42"), datetime.datetime(2009, 11, 1, 23, 47, 47, 45115)]'
  >>> my_str([Decimal('42'), datetime.now()])
  '[42,2009-11-01 23:47:51.517091]'

Written at 8:59 AM by Ehsan.

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