I have the following sample data that are stored in a file:
[
{ "keys": ["val1", "val2"], "args": { "arg1": "val1", "arg2": "val2" } },
{ "keys": ["val1", "val2", "val3"], "args": { "arg": "val" } },
{ "keys": ["val"], "args": {} }
]
As you may realise, this is a list
of dictionaries
. Each dictionary has key keys
contains arbitrary length of list and key args
contains a dictionary
How could I parse this sample data back into Python
object
with open('file_name') as file:
source = file.read()
data = how_to_parse(source)
for arr in data:
print(arr)
# Expected result
# { "keys": ["val1", "val2"], "args": { "arg1": "val1", "arg2": "val2" } }
# { "keys": ["val1", "val2", "val3"], "args": { "arg": "val" } }
# { "keys": ["val"], "args": {} }
The pyparsing wiki includes this example https://pyparsing.wikispaces.com/file/view/parsePythonValue.py/31712649/parsePythonValue.py which I implemented at a time when ast.literal_eval
was not yet available. Using this code, your expression can be parsed using:
print listItem.parseString("""[
{ "keys": ["val1", "val2"], "args": { "arg1": "val1", "arg2": "val2" } },
{ "keys": ["val1", "val2", "val3"], "args": { "arg": "val" } },
{ "keys": ["val"], "args": {} }
]""")[0]
which gives:
[{'keys': ['val1', 'val2'], 'args': {'arg1': 'val1', 'arg2': 'val2'}},
{'keys': ['val1', 'val2', 'val3'], 'args': {'arg': 'val'}},
{'keys': ['val'], 'args': {}}]
There are many more examples at https://pyparsing.wikispaces.com/Examples for your self-edification.