In Python, Compute Average Of All Numbers In File

def read_all(path):
    nums = None
    try:
        with open(path, 'r') as file:
            for line in file:
                if not nums:
                    nums = []
                try:
                    nums.append(int(line.strip()))
                except ValueError:
                    pass
    except IOError as e:
        print(e)
    return nums

def average(nums):
    if not nums:
        return None

    total = 0
    count = 0
    for num in nums:
        total += num
        count += 1
    return total/count
    
if '__main__' == __name__:
    nums = read_all('number.dat')
    print(nums)
    print('average', average(nums))

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