3 examples of 'create dictionary from two lists python' in Python

18
def merge_list_dicts(list_dicts):
19
    z = list_dicts[0].copy()   # start with x's keys and values
20
    for i in range(1, len(list_dicts)):
21
        z.update(list_dicts[i])  # modifies z with y's keys and values & returns None
22
    return z

12
def create_dict(src_dict, dest_dict, list_of_keys):
13
    result = {}
14
    tail = ''
15
    for i in list_of_keys:
16
        # 'KEY1, KEY2, KEY3'
17
        if ',' in i:
18
            list_of_i = i.split(', ')  # ['KEY1', 'KEY2', 'KEY3']
19
            tail = ''.join(['[%s]' % j for j in list_of_i])  # '[KEY1][KEY2][KEY3]'
20
        else:
21
            tail = '[%s]' % i
22
        k = src_dict + tail
23
        k = re.sub(r'destination_ipv6_network', 'destination_network', k)
24
        k = re.sub(r'destination_ipv4_network', 'destination_network', k)
25
        k = re.sub(r'source_ipv6_network', 'source_network', k)
26
        k = re.sub(r'source_ipv4_network', 'source_network', k)
27
        v = dest_dict + tail
28
        result[k] = v
29
30
    return result

152
def list2dict(a_list, keyitem, alwayslist=False):
153
    '''Return a dictionary with specified keyitem as key, others as values.
154
       keyitem can be an index or a sequence of indexes.
155
       For example: li=[['A','a',1],
156
                        ['B','a',2],
157
                        ['A','b',3]]
158
                    list2dict(li,0)---> {'A':[('a',1),('b',3)],
159
                                         'B':('a',2)}
160
       if alwayslist is True, values are always a list even there is only one item in it.
161
                    list2dict(li,0,True)---> {'A':[('a',1),('b',3)],
162
                                              'B':[('a',2),]}
163
    '''
164
    _dict = {}
165
    for x in a_list:
166
        if isinstance(keyitem, int):      # single item as key
167
            key = x[keyitem]
168
            value = tuple(x[:keyitem] + x[keyitem + 1:])
169
        else:
170
            key = tuple([x[i] for i in keyitem])
171
            value = tuple([x[i] for i in range(len(a_list)) if i not in keyitem])
172
        if len(value) == 1:      # single value
173
            value = value[0]
174
        if key not in _dict:
175
            if alwayslist:
176
                _dict[key] = [value, ]
177
            else:
178
                _dict[key] = value
179
        else:
180
            current_value = _dict[key]
181
            if not isinstance(current_value, list):
182
                current_value = [current_value, ]
183
            current_value.append(value)
184
            _dict[key] = current_value
185
    return _dict