[Politics and War] Python rewrite of Sheepy's PHP infra calculator

pnw_infra_tools.py

# [what]    JDTech's Python rewrite of Sheepy's PHP infra calculator
# [license] MIT
# [updated] 2020-09-02

def infra_price(amt: float) -> float:
    """Calculates infra price at a certain infra level
    Args:
        amt (float): Infra level
    Returns:
        float: Price of one (1) infra at specified infra level
    """

    return (abs(amt - 10)**2.2 / 710) + 300


def infra_cost(_from: float = 0.0, _to: float = 100.0, udp: bool = False, cce: bool = False) -> float:
    """Calculates the total cost of buying infra to specified level from specified starting level
    Args:
        _from (float): starting infra
        _to (float): ending infra
        udp (bool): urbanization domestic policy?
        cce (bool): center for civil engineering project?
    Returns:
        (float): Total cost of infra
    """

    value: float = 0    # total cost of infra

    # Rounding
    _from, _to = round(_from, 2), round(_to, 2)

    # Calc difference
    difference = _to - _from
    
    # Input validation
    if difference > 10000:    # Too big
        raise ValueError("Difference between starting and ending infra is greater than 10000")
    elif difference == 0:     # 0 infra bought
        return 0.0
    elif difference < 0:      # Selling infra
        return difference * 150

    # Actual calculation time (with some spicy recursion)
    if difference > 100:
        thing = 100 if difference % 100 == 0 else difference % 100

        chunk_cost = round(infra_price(_from), 2) * thing
        value += chunk_cost + infra_cost(_from + thing, _to)
    else:
        value += round(infra_price(_from), 2) * difference

    # Add urbanization and CCE discounts
    discounts = (0.05 * value if udp else 0) + (0.05 * value if cce else 0)

    return value - discounts


if __name__ == '__main__':
    while True:
        start = float(input("Starting infra: "))
        end = float(input("Ending infra: "))
        urban = input("Urbanization? (y/n), default n: ") == 'y'
        cce = input("CCE project? (y/n), default n: ") == 'y'

        cost = infra_cost(start, end, udp=urban, cce=cce)

        print(f'${cost:,.2f}\n---')