formdata: iterate over a copy of dict keys when flattening it (#36515)
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@ -96,7 +96,7 @@ def get_dict_with_varnames(fields, data, formdata=None, varnames_only=False):
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return new_data
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def flatten_dict(d):
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for k, v in d.items():
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for k, v in list(d.items()):
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if type(v) is dict:
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flatten_dict(v)
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for k2, v2 in v.items():
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