MITx: 6.00.1x_Problem_Set_1.3

#s = 'awmorbob5bobcoahvyepoeiaciie'
#s = 'tkobookmwbobooboboofoboboobuobobsipbu'
#s = 'azbcbobobegghakl'
#s = 'xwxmhdcowiqzpfodumm'
s = 'abcdefghijklmnopqrstuvwxyz'

alphabet = ['a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z']
currentString = longestString = ''
currentCharKey = 0
previewCharKey = 0
sI = 0
for sChar in s:
    #print 'Checking char: "' + sChar + '"'
    charKeyInAlphabet = 0
    for alphabetChar in alphabet:
        #print 'is char "' + sChar + '" == "' + alphabetChar + '":'
        if alphabetChar == sChar:
            #print 'True'
            break
        #else:
            #print 'False'
        charKeyInAlphabet += 1
        #print 'Increment "charKeyInAlphabet" up to:' + str(charKeyInAlphabet)

    #print 'is charKeyInAlphabet are not alphabet key: '
    if charKeyInAlphabet > len(alphabet):
        #print 'True'
        #print 'is currentString longer then longestString:'
        if len(longestString) < len(currentString):
            #print 'True'
            longestString = currentString
        #else:
            #print 'False'
        currentString = sChar
        #print 'currentString is now: ' + currentString
        #print 'previewCharKey is now: ' + str(previewCharKey)
        previewCharKey = charKeyInAlphabet
    #else:
        #print 'False'

    #print 'is char "'+sChar+'" in alphabet row with "' + currentString + ' string:'
    if previewCharKey <= charKeyInAlphabet and len(s) > (sI+1):
        #print 'True'
        currentString += sChar
        previewCharKey = charKeyInAlphabet
        #print 'currentString is now: ' + currentString
        #print 'previewCharKey is now: ' + str(previewCharKey)
    else:
        if previewCharKey <= charKeyInAlphabet:
            currentString += sChar
        #print 'is currentString longer then longestString:'
        if len(longestString) < len(currentString):
            #print 'True'
            longestString = currentString
        #else:
            #print 'False'
        currentString = sChar
        #print 'currentString is now: ' + currentString
        #print 'previewCharKey is now: ' + str(previewCharKey)
        previewCharKey = charKeyInAlphabet

        #print 'False'
    sI += 1






print 'Longest substring in alphabetical order is: ' + longestString