摘要：
A tuple is a sequence of values. The values can be any type, and they are indexed by integers, so in that respect tuples are a lot like lists. The imp... 阅读全文
摘要：
If you played with the Fibonacci function, you might have noticed that the bigger the argument you provide, the longer the function takes to run. Furt... 阅读全文
摘要：
Lists can appear as values in a dictionary. For example, if you were given a dictionary that maps from letters to frequencies, you might want to inver... 阅读全文
摘要：
If you use a dictionary in a for statement, it traverses the keys of the dictionary. For example, print_hist prints each key and the corresponding val... 阅读全文