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Commit e646e19

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kyclarkkyclark
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‎appendix/examples/.gitignore‎

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out.txt
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‎appendix/examples/args.py‎

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#!/usr/bin/env python3
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import os
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import sys
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args = sys.argv[1:]
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num = len(args)
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print('There are {} arg{}'.format(num, '' if num == 1 else 's'))
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‎appendix/examples/codons.py‎

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#!/usr/bin/env python3
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"""Extract codons from DNA"""
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import os
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import sys
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args = sys.argv[1:]
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num_args = len(args)
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if not 1 <= num_args <= 2:
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print('Usage: {} DNA'.format(os.path.basename(sys.argv[0])))
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sys.exit(1)
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string = args[0]
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k = 3
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n = len(string) - k + 1
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for i in range(0, n, k):
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print(string[i:i+k])
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‎appendix/examples/create_dir.py‎

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#!/usr/bin/env python3
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"""Test for a directory and create if needed"""
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import os
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import sys
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args = sys.argv[1:]
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if len(args) != 1:
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print('Usage: {} DIR'.format(os.path.basename(sys.argv[0])))
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sys.exit(1)
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dirname = args[0]
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if os.path.isdir(dirname):
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print('"{}" exists'.format(dirname))
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else:
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print('Creating "{}"'.format(dirname))
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os.makedirs(dirname)
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‎appendix/examples/default_arg.py‎

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#!/usr/bin/env python3
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import os
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import sys
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args = sys.argv[1:]
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num_args = len(args)
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if not 1 <= num_args <= 2:
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print('Usage: {} FILE [NUM]'.format(os.path.basename(sys.argv[0])))
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sys.exit(1)
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file = args[0]
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num = args[1] if num_args == 2 else 10
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print('FILE is "{}", NUM is "{}"'.format(file, num))
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‎appendix/examples/kmers.py‎

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#!/usr/bin/env python3
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"""Extract k-mers from string"""
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import os
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import sys
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args = sys.argv[1:]
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num_args = len(args)
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if not 1 <= num_args <= 2:
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print('Usage: {} STR [K]'.format(os.path.basename(sys.argv[0])))
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sys.exit(1)
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string = args[0]
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k = args[1] if num_args == 2 else '3'
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# Guard against a string like "foo"
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if not k.isdigit():
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print('k "{}" is not a digit'.format(k))
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sys.exit(1)
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# Safe to convert now
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k = int(k)
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if len(string) < k:
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print('There are no {}-length substrings in "{}"'.format(k, string))
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else:
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n = len(string) - k + 1
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for i in range(0, n):
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print(string[i:i+k])
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‎appendix/examples/list_dir.py‎

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#!/usr/bin/env python3
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"""Show contents of directory argument"""
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import os
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import sys
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args = sys.argv[1:]
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if len(args) != 1:
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print('Usage: {} DIR'.format(os.path.basename(sys.argv[0])))
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sys.exit(1)
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dirname = args[0]
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if not os.path.isdir(dirname):
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print('"{}" is not a directory'.format(dirname), file=sys.stderr)
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sys.exit(1)
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for entry in os.listdir(dirname):
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print(entry)
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‎appendix/examples/name_args.py‎

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#!/usr/bin/env python3
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import os
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import sys
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args = sys.argv[1:]
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if len(args) != 2:
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print('Usage: {} FILE NUM'.format(os.path.basename(sys.argv[0])))
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sys.exit(1)
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file, num = args
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file = args[0]
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num = args[1]
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print('FILE is "{}", NUM is "{}"'.format(file, num))
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‎appendix/examples/nobody.txt‎

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I’m Nobody! Who are you?
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Are you – Nobody – too?
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Then there’s a pair of us!
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Don’t tell! they’d advertise – you know!
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How dreary – to be – Somebody!
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How public – like a Frog –
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To tell one’s name – the livelong June –
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To an admiring Bog!
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Emily Dickinson
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‎appendix/examples/read_file.py‎

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#!/usr/bin/env python3
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"""Read a file argument"""
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import os
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import sys
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args = sys.argv[1:]
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if len(args) != 1:
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print('Usage: {} FILE'.format(os.path.basename(sys.argv[0])))
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sys.exit(1)
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filename = args[0]
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if not os.path.isfile(filename):
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print('"{}" is not a file'.format(filename), file=sys.stderr)
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sys.exit(1)
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for line in open(filename):
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print(line, end='')

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