Compsci 6, Fall 2011, Classwork 9

Name: __________________________   NetID: _____________

Name: __________________________   NetID: _____________

Name: __________________________   NetID: _____________

Problems:

1. Consider the following code. What is output?

   strand = 'cgcgcgaaattt'
   length =  len(strand)
   xx =  [1 for ch in strand]
   yy = [ch+ch for ch in strand]
   zz = [3 for silly in strand]
   print xx 
   print sum(xx)
   print yy
   print zz
   print sum([1 for ch in strand if ch =='g' or  ch == 'c'])
   
   output:
    
   
   
   
   
   
   
   

2. Complete the function

   def joinTogether(mylist, separator):
       # TODO: convert the list mylist into a string of items from 
       #        mylist separated by separator
   
   
   
   
   
   
   
   
   
   
   
       
       
       
       
       
       return "replace me"
   

3. Complete the function

   def processLine(line):
       words = line.split()   # put the words into a list
       # TODO: Given a string of words, create a new string from those
       # words keeping only the words whose length is greater than 4
       
   
   
   
   
   
   
   
   
   
   
       
       return "replace me"