11 lines
303 B
Python
11 lines
303 B
Python
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import json
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def dict_raise_on_duplicates(ordered_pairs):
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"""reject duplicate keys"""
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my_dict = dict()
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for key, values in ordered_pairs:
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if key in my_dict:
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raise ValueError("Duplicate key: {}".format(key,))
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else:
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my_dict[key] = values
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return my_dict
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