Given this bunch of python objects (lists and dicts):
d = [
{
'props': {
'columns': [
{
'field': 'Hello'
}
]
}
}
]
How would I use a string using dot-notation to return the 'field' value?:
get(d, "[0].props.columns[0].field") # "get" is fictitious and just an example
>>> 'Hello'
I found this article below which talks about converting the dicts into Python object to allow dot-notation, however I'm unsure how to make it usable with a string representation of the dot-notation. https://johschmidt42.medium.com/how-to-transform-a-dict-to-an-object-in-python-ba0c7ef0fd95 E.g. This works:
# this works
d[0].props.columns[0].field
# this (obviously) doesn't
"d[0].props.columns[0].field"
## technically, the d[0] part doesn't work since the Dict2Object class init doesn't currently support an initial `list` object, but assume this *does* work (although I need to get this code working as well)
This is what I have currently:
import json
class Dict2Object:
"""
@DynamicAttrs
Class to transform a dict into a python object.
"""
def __init__(self, in_dict):
# type checking
assert isinstance(in_dict, (dict, list))
# iterate over dict
if isinstance(in_dict, dict):
for key, val in in_dict.items():
# translate the string to not have white spaces, dashes and be lower case etc
key = translate_string(key)
# check if the value is a (tuple, list, set)
if isinstance(val, (list, tuple, set)):
# set an attribute for every item in the Sequence
# if the value is a dict, use the Dict2Object class (recursive)
setattr(
self,
key,
[Dict2Object(x) if isinstance(x, dict) else x for x in val],
)
else:
# if the value is not a (tuple, list, set)
# set an attribute for the value unless
# the value is a dict -> use the Dict2Object class (recursive)
setattr(self, key, Dict2Object(val) if isinstance(val, dict) else val)
def __repr__(self):
return "{%s}" % str(
", ".join("'%s': %s" % (k, repr(v)) for (k, v) in self.__dict__.items())
)
def translate_string(string):
string = string.replace("-", "_")
string = string.replace(" ", "_")
string = string.lower()
return string
d = [
{
'props': {
'columns': [
{
'field': 'Hello'
}
]
}
}
]
d_obj = Dict2Object(d[0])
d_obj.props.columns[0].field
>>> 'Hello'
