[Python] Compare 2 nested dicts ignoring whitespace in strings

I want to compare two nested python dicts and ignore whitespace in the values. In the following example a compare function should return true as d1 and d2 are equal except for whitespace.

d1 = {
'key1': 'value1',
'key2': {
'key2_1': 'value2_1',
'key2_2': 'value2_2',
'key2_3': {
'key2_3_1': 'value2_3_1'
}
}
}

d2 = {
'key1': 'val ue1',
'key2': {
'key2_1': 'val \n ue2_1',
'key2_2': 'value2_2',
'key2_3': {
'key2_3_1': 'value2_3_1\n'
}
}
}


Is there a build-in way to do it or do I have to recurse through all levels and compare the strings?

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