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 01-29-2012, 01:42 AM PM User | #1 pedrowski New to the CF scene   Join Date: Jan 2012 Posts: 1 Thanks: 0 Thanked 0 Times in 0 Posts How do I test for multiple conditions in Python I am having trouble testing an indice for multiple values. I need to see if var[-3:] is one of three acceptable strings 'tag','taa','tga'. this is what I have so far: dna = 'n' i = 0 x = 1 count = 0 while (dna != 'q'): dna = raw_input("Input DNA sequence, or 'q' to quit: ") dna = dna.lower() seq2 = [dna[i:i+3] for i in range(0, len(dna), 3) ] codons = len(dna) / 3 if len(dna) % 3 != 0: # Ensure dna is a multiple of 3 print 'not a multiple of 3' continue elif dna[0:3] != 'atg': # ensure that 'atg' is the first string print 'Not DNA, no start codon' continue elif dna[-3:] != 'tga': while (dna[-3:] != 'tga'): if dna[-3:] != 'tag': while (dna[-3:] != 'tag'): if dna[-3:] != 'taa': print 'Not DNA, no stop codon' break THE LAST 7 LINES OF CODE ARE TESTING dna TO SEE IF IT ENDS WITH ONE OF THOSE STRING. HOWEVER, I CANT SEEM TO GET OUT OF THE LOOP PROPERLY. WHAT DO I DO ? CAN I TEST FOR ALL 3 IN ONE STATEMENT ?

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