try: f = open('blah', 'r')except IOError, e: print 'could not open file:', e print float(12345)print float('12345')print float('123.45e67')def safe_float(obj): try: retval = float(obj) except ValueError: retval = 'could not convert non-number to float' return retvalprint safe_float('12.34')print safe_float('bad input')print safe_float({'a': 'Dict'})
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