How to remove an element from a list by index
Use del and specify the index of the element you want to delete: Also supports slices: Here is the section from the tutorial.
indexing
Python Pandas: Get index of rows which column matches certain value
df.iloc[i] returns the ith row of df. i does not refer to the index label, i is a 0-based index. In contrast, the attribute index returns actual index labels, not numeric row-indices: or equivalently, You can see the difference quite clearly by playing with a DataFrame with a non-default index that does not equal to the row’s numerical position: If you want to use the index, … Read more
How do composite indexes work?
Composite indexes work just like regular indexes, except they have multi-values keys. If you define an index on the fields (a,b,c) , the records are sorted first on a, then b, then c. Example:
Python: find position of element in array
Have you thought about using Python list’s .index(value) method? It return the index in the list of where the first instance of the value passed in is found.
Map like structure in C: use int and struct to determine a value
You’ll probably have to make your own structure. The C Programming Language by Kernighan and Ritchie has an example of making an associate map in c, and what I’ll detail below is based on what I remember from that. Basically you’ll need a struct Map that contains struct Key and struct Value. struct Key contains elements that determine the value (in your case 2 … Read more
Why did ‘reset_index(drop=True)’ function unwantedly remove column?
As the saying goes, “What happens in your interpreter stays in your interpreter”. It’s impossible to explain the discrepancy without seeing the full history of commands entered into both Python interactive sessions. However, it is possible to venture a guess: df.reset_index(drop=True) drops the current index of the DataFrame and replaces it with an index of increasing … Read more
Index Error: list index out of range (Python) [duplicate]
I am a beginner programmer and im not sure what this means… Index Error: list index out of range
Error”Can only compare identically-labeled Series objects” and sort_index
I think you need reset_index for same index values and then comapare – for create new column is better use mask or numpy.where: Also instead + use | because working with booleans. Samples:
IndexError: too many indices for array
I know there is a ton of these threads but all of them are for very simple cases like 3×3 matrices and things of that sort and the solutions do not even begin to apply to my situation. So I’m trying to graph G versus l1 (that’s not an eleven, but an L1). The data … Read more
Error : Index was outside the bounds of the array.
You have declared an array that can store 8 elements not 9. It means postStatus will contain 8 elements from index 0 to 7.