Task #1

position = [
    ['2019-05-01', '6'],
    ['2019-05-02', '5'],
    ['2019-05-03', '5'],
    ['2019-05-04', '4'],
    ['2019-05-05', '5'],
    ['2019-05-06', '5'],
    ['2019-05-07', '4'],
    ['2019-05-08', '4'],
    ['2019-05-09', '3'],
    ['2019-05-10', '3'],
]
count_lines = 0

for row in position:
    count_lines +=1  #цикл, подсчитывающий количество строк в данных
print(count_lines)