If you want to avoid the banker's rounding system and always round half up (i.e., round to the nearest integer and if the number is exactly halfway between two integers, round up), you can use the decimal module in Python.

The decimal module provides a more precise floating-point representation than the built-in float type, and it has a ROUND_HALF_UP rounding mode that always rounds half up. Here's an example: 

In this example, we're using the Decimal class from the decimal module to represent the number we want to round ('2.5'), and then calling the quantize() method to round it to the nearest integer. We pass the Decimal('1') argument to quantize() to specify that we want to round to the nearest integer, and we pass the ROUND_HALF_UP constant from the decimal module to specify that we always want to round half up.

The quantize() method returns a new Decimal object that represents the rounded value, which we store in the variable rounded_x and print to the console.

Note that using the decimal module can be slower and more memory-intensive than using the built-in float type, so it's best to only use it when you need the additional precision or specific rounding behavior that it provides.