python之字典的书写

>>> a = dict(one=1, two=2, three=3)
>>> b = {‘one‘: 1, ‘two‘: 2, ‘three‘: 3}
>>> c = dict(zip([‘one‘, ‘two‘, ‘three‘], [1, 2, 3]))
>>> d = dict([(‘two‘, 2), (‘one‘, 1), (‘three‘, 3)])
>>> e = dict({‘three‘: 3, ‘one‘: 1, ‘two‘: 2})

个人喜欢第1,2种，检查这些是否相等

>>> a == b == c == d == e
True

>>> d = {‘a‘: 12, ‘c‘: 13, ‘b‘: 14}

#字典的修改
>>> d[‘a‘] = 1
>>> d
{‘a‘: 1, ‘c‘: 13, ‘b‘: 14}

#删除字典
>>>del d

>>> d = {‘a‘:12, ‘c‘:13, ‘b‘:14}
>>> d #直接输出
{‘a‘: 12, ‘c‘: 13, ‘b‘: 14}
>>> d[‘a‘] #输出某个值
12

1 >>> list(d.keys())
2 [‘a‘, ‘c‘, ‘b‘]

1 >>> sorted(d.keys())
2 [‘a‘, ‘b‘, ‘c‘]

>>> for key in d:
...     print(key,‘:‘, d[key]) #d[key] 就是其value值


#整理其值后遍历
>>> for key in sorted(d):  
...          print(key, ‘:‘, d[key])


#使用 enumerate() 函数
>>> for i, v in enumerate(d):
...     print(i,v,‘:‘, d[v])
...
0 a : 12
1 c : 13
2 b : 14

#使用items（）方法遍历
 >>> for key, value in d.items():
 ...     print(key,‘:‘, value)
 ...
 a : 12
 c : 13
 b : 14


#将字典a和d打包遍历输出
>>> a = dict(one=1, two=2, three=3)
>>> for i, j in zip(a, d):
...     print(i, ‘:‘, a[i], j, ‘:‘, d[j])
...
one : 1 a : 12
two : 2 c : 13
three : 3 b : 14

1 >>> def dict_test(d):
2 ...     for key in sorted(d):
3 ...         print(key, ‘:‘, d[key])
4 ...
5 >>> dict_test(d)
6 a : 12
7 b : 14
8 c : 13

 1 >>> def dict_test_more(**d):
 2 ...     for key in sorted(d):
 3 ...         print(key, ‘:‘, d[key])
 4 ...
 5 
 6 >>> dict_test_more(**d)
 7 a : 12
 8 b : 14
 9 c : 13
10 
11 
12 >>> dict_test_more(one=1, two=2, three=3)
13 one : 1
14 three : 3
15 two : 2