def insertionSort(inventory):
    indexingRange = range(2, len(inventory) + 1) # 2 .. len(inventory) + 1
 
    for i in indexingRange:
        x = inventory[i][1]
 
        while i > 1 and inventory[i-1][1] > x: # check i value first and compare with 1
            inventory[i-1], inventory[i] = inventory[i], inventory[i-1]
            i = i - 1
    return inventory
 
print(insertionSort(
    {1: ['', 1],
    2: ['', 2],
    3: ['', 3],
    4: ['', 4],
    5: ['', 8],
    6: ['', 20],
    7: ['', 2]}
    )
)

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