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Lab 2 2/7/2012 Fah Sathirapongsasuti <[email protected]> and Emily Kay <[email protected]> print vs return (in a function) Respect function prototype! Function as abstraction. Python help (i.e. help(function) e.g. help(sorted)) Handling arrays a. Append, extend, concatenate b. Slicing notation (x[1:5], x[:10], x[1:2] = [1,2,3]) c. Last elements (x[-1]) d. Copy vs reference 5. Handling strings a. Str.strip() b. Str.split() c. “\t”.join() 6. Loop routines a. Looping over a list b. Keeping track of something through the loop (e.g. sum, don’t reset at beginning of the loop) c. While loop vs for loop d. Different ways to do for loop (for x in list, for i in range(len(list))) 7. Unix a. Cat, head, less, grep, wc b. Piping: i. Cat file1 file2 | less ii. Head file1 > file1.head iii. Python printSomething.py > outfile.txt c. Sys.stdin i. Format fastq --> fasta ii. Deal with BED file 8. Two examples from Monday’s lecture note 9. if __name__ == “__main__”: 10. import csv 1. 2. 3. 4.