list
list.reverse()
list.sort()
list.index(obj):obj is the object to be find out; it returns index of the found object otherwise raise an exception indicating that value does not find.
aList = [123, 'xyz', 'zara', 'abc'];
print "Index for xyz : ", aList.index( 'xyz' ) ; //return 1
print "Index for zara : ", aList.index( 'zara' ) ;//return 2
list.append(x)
list.insert(i, x):insert x after list[i].
list.pop():the last item will be removed.
list.pop(3) :delete the list[3].the argument is index.so sometimes, you may use list.pop(list.index(obj))
list.remove(sth):delete the 'sth'.
list.extend(an_iter):add each item from the iterable an_iter onto the list.
Difference between extend and append:
iteration
warning: we can't modify a list while interating over it.
settle: create another list
dictionary
A dictionary is an unordered collection of key: value pairs, with each key in a dictionary being distinct.
key：immutable
value: mutable
Convert Iterable of Pairs into Dictonary
dict() 、dict(an_iter)
将一对值转换为dict的key-value形式，前提是key是immutable的。如果一个key值出现了多次，那么这个key对应的value为最后一个key出现时对应的值。如果要转换的值已经是一个dict了，那么就返回一个这个dict的副本。
Get Value in Dictionary by Key
dict[key]、dict.get(key)、dict.get(key, default)
如果key不在这个dictionary里，就返回一个keyError信息；如果提供了default值，那就返回default值。
Remove Key from Dictionary and Return its Value
dict.pop(key)、dict.pop(key, default)
删掉key对应的value，并返回value
Get List of all Key/Value Pairs in Dictionary
dict.items()
返回这个dict中得所有键值对，（key, value）的list形式，经常用于for循环中。
