I'd like to create a list that is composed of dictionary keys, but those dictionaries are nested within a list. For example, given the below JSON:
{
"test_cases": [{
"name": "first request",
"request": {
"url": "{{env_base_url}}/v2/597649d3110000be08b1be84/{{env_userName}}"
},
"variables": {
"var1": "some stuff",
"var2": "some other stuff"
}
},
{
"name": "second request",
"request": {
"url": "{{env_base_url}}/v2/597649d3110000be08b1be84/{{env_userName}}"
},
"variables": {
"var3": "some new stuff",
"var4": "some other new stuff"
}
}
]
}
I'd like to create list of all of the keys from each test_case's variables - Sample output would be:
list = ['var1', 'var2', 'var3', 'var4]
I have code that accomplishes this, but it seems unnecessarily complicated...
test_var_names = [list(test['variables'].keys()) for test in data['test_cases']]
i =0
while i < len(test_var_names):
test_var_name = test_var_names[i]
if isinstance(test_var_name, list):
for item in test_var_name:
test_var_names.append(item)
test_var_names.remove(test_var_name)
i = i-1
i += 1
print (test_var_names)
You can use a list comprehension like so:
lst = [k for d in dct['test_cases'] for k in d['variables'].keys()]
# ['var1', 'var2', 'var4', 'var3']
Note that the order of the keys for each inner dict is not guaranteed since dicts are not ordered in < Python 3.6
This list comprehension is more forgiving to malformed data (eg it would ignore data that did not contain variables
).
d = {
"test_cases": [{
"name": "first request",
"request": {
"url": "{{env_base_url}}/v2/597649d3110000be08b1be84/{{env_userName}}"
},
"variables": {
"var1": "some stuff",
"var2": "some other stuff"
}
},
{
"name": "second request",
},
{
"name": "third request",
"request": {
"url": "{{env_base_url}}/v2/597649d3110000be08b1be84/{{env_userName}}"
},
"variables": {
"var3": "some new stuff",
"var4": "some other new stuff"
}
}
]
}
>>> [var
for sublist in [case.get('variables', {}).keys() for case in d.get('test_cases', [])]
for var in sublist]
['var1', 'var2', 'var4', 'var3']
Although the code above is efficient, this is more readable:
variables = []
items = d.get('test_cases')
for item in items:
variables.extend(item.get('variables', {}).keys())
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