如何从两个列表创建嵌套字典？

Question

I have two lists:

ramp_versions=['RAMPS_1_6','RAMPS_10','RAMPS_11','RAMPS_7','RAMPS_8_9']
columns=['Version','Date','Total_Ramps','Virtual_Ramps','Real_Ramps','Real_Ramps_With_All_Measurements','Real_Ramps_Unsurveyable','Real_Ramps_Partial_With_999','Real_Ramps_Partial_WO_999','Real_Ramps_Partial_W_RAMP_WIDTH_<36_or_DWS_BAD']

I want to create a nested dictionary where each ramp_version is a key and the values are a dictionary where each value in the columns is a key

So this is what I am after:

{'RAMPs_1_6': {'Version': "value",'Date': "value", 'Total_Ramps': "value", etc..},'RAMPS_10': {'Version': "value",'Date': "value", 'Total_Ramps': "value", etc..}

Answer 1

Use dict comprehension:

{ver: {col: "value" for col in columns} for ver in ramp_versions}

Output:

{'RAMPS_1_6': {'Version': 'value',
  'Date': 'value',
  'Total_Ramps': 'value',
  'Virtual_Ramps': 'value',
  'Real_Ramps': 'value',
  'Real_Ramps_With_All_Measurements': 'value',
  'Real_Ramps_Unsurveyable': 'value',
  'Real_Ramps_Partial_With_999': 'value',
  'Real_Ramps_Partial_WO_999': 'value',
  'Real_Ramps_Partial_W_RAMP_WIDTH_<36_or_DWS_BAD': 'value'},
 'RAMPS_10': {'Version': 'value',
  'Date': 'value',
  'Total_Ramps': 'value',
  'Virtual_Ramps': 'value',
  'Real_Ramps': 'value',
  'Real_Ramps_With_All_Measurements': 'value',
  'Real_Ramps_Unsurveyable': 'value',
  'Real_Ramps_Partial_With_999': 'value',
  'Real_Ramps_Partial_WO_999': 'value',
  'Real_Ramps_Partial_W_RAMP_WIDTH_<36_or_DWS_BAD': 'value'},
 'RAMPS_11': {'Version': 'value',
  'Date': 'value',
  'Total_Ramps': 'value',
  'Virtual_Ramps': 'value',
  'Real_Ramps': 'value',
  'Real_Ramps_With_All_Measurements': 'value',
  'Real_Ramps_Unsurveyable': 'value',
  'Real_Ramps_Partial_With_999': 'value',
  'Real_Ramps_Partial_WO_999': 'value',
  'Real_Ramps_Partial_W_RAMP_WIDTH_<36_or_DWS_BAD': 'value'},
 'RAMPS_7': {'Version': 'value',
  'Date': 'value',
  'Total_Ramps': 'value',
  'Virtual_Ramps': 'value',
  'Real_Ramps': 'value',
  'Real_Ramps_With_All_Measurements': 'value',
  'Real_Ramps_Unsurveyable': 'value',
  'Real_Ramps_Partial_With_999': 'value',
  'Real_Ramps_Partial_WO_999': 'value',
  'Real_Ramps_Partial_W_RAMP_WIDTH_<36_or_DWS_BAD': 'value'},
 'RAMPS_8_9': {'Version': 'value',
  'Date': 'value',
  'Total_Ramps': 'value',
  'Virtual_Ramps': 'value',
  'Real_Ramps': 'value',
  'Real_Ramps_With_All_Measurements': 'value',
  'Real_Ramps_Unsurveyable': 'value',
  'Real_Ramps_Partial_With_999': 'value',
  'Real_Ramps_Partial_WO_999': 'value',
  'Real_Ramps_Partial_W_RAMP_WIDTH_<36_or_DWS_BAD': 'value'}}

Answer 2

Another version:

nest = {}
for r in ramp_versions:
   nest[r] = dict(zip(columns, ['val' for x in columns]))

Answer 3

Simply run a loop for keys and set values for that in an empty defined dictionary

see the following example:

ramp_versions=['RAMPS_1_6','RAMPS_10','RAMPS_11','RAMPS_7','RAMPS_8_9']
columns=['Version','Date','Total_Ramps','Virtual_Ramps','Real_Ramps','Real_Ramps_With_All_Measurements','Real_Ramps_Unsurveyable','Real_Ramps_Partial_With_999','Real_Ramps_Partial_WO_999','Real_Ramps_Partial_W_RAMP_WIDTH_<36_or_DWS_BAD']

my_dict = {}

i=0
for ramp in ramp_versions:
    my_dict[ramp] = columns[i]
    i+=1

print(my_dict)
# print(my_dict.keys())
# print(my_dict.values())