少儿编程网

最近闲着无聊，就搞了个DNA动画（基于Python3，我用的是3.10）

import random, sys, time

PAUSE = 0.15  

# These are the individual rows of the DNA animation:
ROWS = [
    '         ##',  # Index 0 has no {}.
    '        #{}-{}#',
    '       #{}---{}#',
    '      #{}-----{}#',
    '     #{}------{}#',
    '    #{}------{}#',
    '    #{}-----{}#',
    '     #{}---{}#',
    '     #{}-{}#',
    '      ##',  # Index 9 has no {}.
    '     #{}-{}#',
    '     #{}---{}#',
    '    #{}-----{}#',
    '    #{}------{}#',
    '     #{}------{}#',
    '      #{}-----{}#',
    '       #{}---{}#',
    '        #{}-{}#']


try:
    print('DNA')
    print('Press Ctrl-C to quit...')
    time.sleep(2)
    rowIndex = 0

    while True:  # Main program loop.
        # Increment rowIndex to draw next row:
        rowIndex = rowIndex + 1
        if rowIndex == len(ROWS):
            rowIndex = 0

        # Row indexes 0 and 9 don't have nucleotides:
        if rowIndex == 0 or rowIndex == 9:
            print(ROWS[rowIndex])
            continue

        # Select random nucleotide pairs, guanine-cytosine and
        # adenine-thymine:
        randomSelection = random.randint(1, 4)
        if randomSelection == 1:
            leftNucleotide, rightNucleotide = 'A', 'T'
        elif randomSelection == 2:
            leftNucleotide, rightNucleotide = 'T', 'A'
        elif randomSelection == 3:
            leftNucleotide, rightNucleotide = 'C', 'G'
        elif randomSelection == 4:
            leftNucleotide, rightNucleotide = 'G', 'C'

        # Print the row.
        print(ROWS[rowIndex].format(leftNucleotide, rightNucleotide))
        time.sleep(PAUSE)  # Add a slight pause.
except KeyboardInterrupt:
    sys.exit()  # When Ctrl-C is pressed, end the program.

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