Modifying a list while iterating when programming with python [duplicate]

Answer 1

def formatter(vals):
    def clamp(x):
        '''Fixes the values between 0 and 100'''
        return max(0, min(100, x))

    def string_formatter(x):
        '''Formats the values into a string with width 4'''
        if x == 100:
            return "{:<4g}".format(x)
        elif x == 0:
            return ' '*4
        else: 
            return "{:>4.1f}".format(x)

    return [string_formatter(clamp(i)) for i in vals]