# stats.py
def get_scores():
    '''Get scores interactively from the user

    post: returns a list of numbers obtained from user'''

def min_value(nums):
    ''' find the minimum

    pre: nums is a list of numbers and len(nums) > 0
    post: returns smallest number in nums'''

def max_value(nums):
    ''' find the maximum

    pre: nums is a list of numbers and len(nums) > 0
    post: returns largest number in nums'''

def average(nums):
    ''' calculate the mean

    pre: nums is a list of numbers and len(nums) > 0
    post: returns the mean (a float) of the values in nums'''

def std_deviation(nums):
    '''calculate the standard deviation

    pre: nums is a list of numbers and len(nums) > 1
    post: returns the standard deviation (a float) of the values
          in nums'''