1. Dictionary: a={'name':'wang','age':88}
2, a is str
a.capitalize : Capitalize the first letter
a.center(3, '*'): Center the content in a, with 3 * on the left and right
a.count('j',1:4): count the number of times j appears in 1 to 4
a.endwith('name'): Does a end with name
a.startwith('name'): Does a start with name