cs_disc_103

#r/discussion

• Discussion notes: link

Discussion 10/3

print("Hello world i am cool")

Shallow copy:

1st2 = [10,9,8,7,["hi","bye"]]
copy2 = lst2[:]

This is the shallow version of copy, which would individually copy across all the elements of the list. However, the inner list will not be deeply copied over as the copied outer list copy2 will still contain the inner list.

lst = [1,2,3,4]
# next(lst) -> STATEMENT WILL ERROR
list_iter = iter(lst)
print(next(list_iter))
print(next(list_iter))
print(next(iter(list_iter)))
list_iter2 = iter(lst)

next(lst) -> error, can only call next on iterators

for statements also move the iterator "market" until end of sequence

Analogy: Iterables are like books, go through them page by page. iterators are like bookmarks.

Iterable uses:

• range -> it returns (definitely) an iterable
• map takes in iterable and func, returns an iterator over function applied to all elements
• filter takes in a function as first parameter and an iterable in the second parameter. It then iterates through iterable if the

function(element in iterable)

returns True

Removes first instance of (x)

You can also iterate through a tuple