'dict' object has no attribute 'has_key' code example

Example 1: graph.has_key

Removed dict.has_key() – use the in operator instead.
Here's an example:
if start not in graph:
    return None

Example 2: 'dict_keys' object has no attribute 'tolist'

>>> test = {'foo': 'bar', 'hello': 'world'}
>>> list(test)
['foo', 'hello']
>>> list(test)[0]
'foo'

Example 3: 'dict_keys' object has no attribute 'tolist'

key, val = next(iter(my_dict.items()))

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Python Example

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