What you’ve run into is called “shadowing”. You’ve created an object in some namespace (either the global namespace of your module, or the local namespace of a function) that has the same name as a the builtin dict type. This prevents you from accessing the builtin dict in the usual way. You can still get to it, with a bit more … Read more
Normally Python throws NameError if the variable is not defined: However, you’ve managed to stumble upon a name that already exists in Python. Because dict is the name of a built-in type in Python you are seeing what appears to be a strange error message, but in reality it is not. The type of dict is a type. All types are objects in … Read more
The pd.DataFrame constructor does not accept a dictionary view as data. You can convert to list instead. Here’s a minimal example: The docs do suggest this: data : numpy ndarray (structured or homogeneous), dict, or DataFrame Equivalently, you can use pd.DataFrame.from_dict, which accepts a dictionary directly:
You can achieve this like following : With C++11 ( and onwards ), With C++17 ( and onwards ),
The equivalent would be class SortedDictionary<TKey, TValue> in the System.Collections.Generic namespace. If you don’t care about the order the class Dictionary<TKey, TValue> in the System.Collections.Generic namespace would probably be sufficient.
Alternative solutions If you’re looking for the smallest value in the dictionary you can do this: If you cannot use min, you can use sorted: Why do I get this error? On a side note, the reason you’re experiencing an Runtime Error is that in the inner loop you modify the iterator your outer loop is based … Read more
To delete a key regardless of whether it is in the dictionary, use the two-argument form of dict.pop(): This will return my_dict[key] if key exists in the dictionary, and None otherwise. If the second parameter is not specified (i.e. my_dict.pop(‘key’)) and key does not exist, a KeyError is raised. To delete a key that is guaranteed to exist, you can also use: This will raise a KeyError if the … Read more
In Python 3.x and 2.x you can use use list to force a copy of the keys to be made: In Python 2.x calling keys made a copy of the keys that you could iterate over while modifying the dict: But note that in Python 3.x this second method doesn’t help with your error because … Read more
Can someone please explain this to me? This doesn’t make any sense to me. I copy a dictionary into another and edit the second and both are changed. Why is this happening?
Firstly, you can del other things besides local variables Both of which should be clearly useful. Secondly, using del on a local variable makes the intent clearer. Compare: to I know in the case of del foo that the intent is to remove the variable from scope. It’s not clear that foo = None is doing that. If somebody just assigned foo … Read more