Python內置函數(28)——hash

英文文檔：

hash(object)Return the hash value of the object (if it has one). Hash values are integers. They are used to quickly compare dictionary keys during a dictionary lookup. Numeric values that compare equal have the same hash value (even if they are of different types, as is the case for 1 and 1.0).

說明：　　

　　1. 返回對象的哈希值，用整數表示。哈希值在字典查找時，可用於快速比較鍵的值。

>>> hash('good good study')
1032709256

　　2. 相等的數值，即使類型不一致，計算的哈希值是一樣的。

>>> 1.0 == 1
True
>>> hash(1.0)
1
>>> hash(1)
1
>>> hash(1.0000)
1