Python Simple ex.

1. Write a program called “print-two-args.py” that reads the first two command line arguments after the program name, stores their values as variables, and then prints them on the same line with a colon between.

> python print-two-args.py hello world

hello : world

2. Write a program called “add-two-args.py” that reads the first two command line arguments after the program name, stores their values as variables, and then prints their sum.

> python add-two-args.py 1 2

3.0

3. Write a program called dna2rna.py that reads a DNA sequence from the first command line argument, and then prints it as an RNA sequence. Make sure it works for both uppercase and lowercase input. (T/t à U/u)

> python dna2rna.py  AGTCAGT

ACUCAGU

> python dna2rna.py actcagt

acucagu

> python dna2rna.py ACTCagt

ACUCagu

4. Write a program get-codons.py that reads the first command line argument as a DNA sequence and prints the first three codons, one per line, in uppercase letters.

> python get-codons.py TTGCAGTCG

TTG

CAG

TCG

> python get-codons.py TTGCAGTCGATC

TTG

CAG

TCG

> python get-codons.py tcgatcgac

TCG

ATC

GAC

5. Write a program that reads a protein sequence as a command line argument and prints the location of the first cysteine residue ('C')

> python find-cysteine.py MNDLSGKTVIITGGARGLGAEAARQAVAAGARVVLADVLDEEGAATARELGDAARYQHLDVTIEEDWQRVCAYAREEFGSVDGL

70

> python find-cysteine.py MNDLSGKTVIITGGARGLGAEAARQAVAAGARVVLADVLDEEGAATARELGDAARYQHLDVTIEEDWQRVVAYAREEFGSVDGL

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