### Typos, formatting.

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 ... ... @@ -101,7 +101,7 @@ Exercise -------- .. note:: ``sum`` is a function which return the sum of all the elements of a list. ``sum`` is a function that returns the sum of all the elements of a list. Wihout using the Python shell, tell what are the effects of the following statements:: ... ... @@ -135,12 +135,12 @@ Here, we compute the mean of the values contained in the list ``x``, after havin Exercise -------- Draw the representation in memory of the following expressions. :: Draw the representation in memory of the ``x`` and ``y`` variables when the following code is executed:: x = [1, ['a','b','c'], 3, 4] x = [1, ['a', 'b', 'c'], 3, 4] y = x y = 'z' # what is the value of x ? # What is the value of x? .. figure:: _static/figs/list_2-1.png :width: 400px ... ... @@ -152,7 +152,7 @@ Draw the representation in memory of the following expressions. :: .. image :: _static/figs/spacer.png When we execute *y = x*, we create ``y`` wich reference the list ``['a', 'b', 'c']``. When we execute *y = x*, we create ``y`` which references the list ``['a', 'b', 'c']``. This list has 2 references on it: ``y`` and ``x`` . ... ... @@ -185,16 +185,22 @@ from the list l = [1, 2, 3, 4, 5, 6, 7, 8, 9] generate 2 lists l1 containing all Exercise -------- generate a list containing all codons. .. note:: A codon is a triplet of nucleotides. A nucleotide can be one of the four letters A, C, G, T Write a function that returns a list containing strings representing all possible codons. Write the pseudocode before proposing an implementation. pseudocode: """"""""""" | *function all_codons()* | *all_codons <- empty list* | *let varying the first base* | *for each first base let varying the second base* | *for each combination first base, second base let varying the third base* | *let vary the first base* | *for each first base let vary the second base* | *for each combination first base, second base let vary the third base* | *add the concatenation base 1 base 2 base 3 to all_codons* | *return all_codons* ... ...
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