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- Whats the difference between [] and {} vs list() and dict()?
I believe that declaring an empty list using list() is more Pythonic (aligns with PEP8 and The Zen philosophy) Facts: 1 there is no direct instruction in PEP 8 on how to do it 2 list() form of declaration is easier to read for people with visual impairments 3
- C# The type or namespace name `List could not be found. But Im . . .
public static List<string> items = new List<string>(); public static List<double> itemsprice = new List<double>(); public static List<double> qu = new List<double>(); That is, there is no type List but there is a generic type List<T> More information and examples of instantiating the generic List<T> can be found in the MSDN documentation
- Meaning of list[-1] in Python - Stack Overflow
All your return c most_common()[-1] statement does is call c most_common and return the last value in the resulting list, which would give you the least common item in that list Essentially, this line is equivalent to:
- python - What does list [x::y] do? - Stack Overflow
If you skip the end index, like in your question, it would take elements from the start index (x), pick every yth element until it reaches the end of the list if y is positive and beginning of the list if y is negative E g l[1::-1] = [2,1] l[1::2] = [2,4,6] The default step size is 1
- What is the difference between an Array, ArrayList and a List?
Also, System Array supports multiple dimensions (i e it has a Rank property) while List and ArrayList do not (although you can create a List of Lists or an ArrayList of ArrayLists, if you want to) An ArrayList is a flexible array which contains a list of objects You can add and remove items from it and it automatically deals with allocating
- TypeError: list indices must be integers or slices, not str
1 A list is used as if it were a dictionary 1 1 Index a list as if it was a dictionary This case commonly occurs when a json object is converted into a Python object but there's a dictionary nested inside a list It is especially annoying (and easy to overlook) if the list has a single dictionary inside it
- c# - define a List like List lt;int,string gt;? - Stack Overflow
List<(int,string)> mylist= new List<(int,string)>(); Which creates a list of ValueTuple type If you're targeting NET Framework 4 7+ or NET NET Core, it's native, otherwise you have to get the ValueTuple package from nuget It's a struct opposing to Tuple, which is a class
- How to overcome TypeError: unhashable type: list
@msh855 You can't hash a list given size 0 or a quadrillion Its the issue with the types not the size LIST DOES NOT HAVE A __hash__ METHOD A work around is create a custom_list type that inherits list with a method __hash__() then convert your list to use the custom_list datatype still better to use built-in types –
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