def kilometers_to_miles(value):
    return.value / 1.609
    
def miles_to_kilometers(value):
    return value * 1.609
    
def years_to_minutes(value)
    return value * 365 * 24 * 60
    
def minutes_to_years(value)
    return value / (365 * 24 *60)
    
def inches_to_cm(value)
    return value / 2.54
    
def cm_to_inches(value)
    return value * 2.54
    
#fin

def kilometers_to_miles(value):
    return value / 1.609
    
def miles_to_kilometers(value):
    return value * 1.609
    
def years_to_minutes(value)
    return value * 365 * 24 * 60
    
def minutes_to_years(value)
    return value / (365 * 24 *60)
    
def inches_to_cm(value)
    return value / 2.54
    
def cm_to_inches(value)
    return value * 2.54
    
#fin

Update convert.py