Learning to understand selection sort

TrustyTony 0 194 Views

By coding algorithm and using some liberal prints with small set of data, you can learn to understand the basic algorithms better than just reading about them.

Here simple selection sort.

""" demonstrating simple selection sort with prints"""

data = [64, 25, 12, 25, 22, 11, 62]

for current in range(len(data)-1):
    min_value_index = current
    print('Sorted: %s, Checking: %s' % (data[:current],data[current:]))
    for index, d in enumerate(data[current:], current):
        if data[min_value_index] > d:
            min_value_index = index
    if min_value_index != current:
        data[current], data[min_value_index] = data[min_value_index], data[current]
    else:
        print('No swap needed')

print('\nReady result:')
print(data)
Member Avatar for TrustyTony
TrustyTony 888 pyMod

OK, if you put one print more you can find a stupid thing I do. Up vote for first one to spot it.

Member Avatar for TrustyTony
TrustyTony 888 pyMod 
""" demonstrating simple selection sort with prints"""

data = [64, 25, 12, 25, 22, 11, 62]

for current in range(len(data)-1):
    min_value_index = current
    print('Sorted: %s, Checking: %s' % (data[:current],data[current:]))
    # min_value_index = current, does not need to check that -> + 1
    for index, d in enumerate(data[current + 1:], current + 1):
        #print(index, min_value_index)
        if data[min_value_index] > d:
            min_value_index = index
    if min_value_index != current:
        data[current], data[min_value_index] = data[min_value_index], data[current]
    else:
        print('No swap needed')

print('\nReady result:')
print(data)
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