Snippets tagged “index”

12 snippets use this tag.

Creating a Pandas DataFrame from a Numpy array: How do I specify the index column and column headers?
Python
To create a Pandas DataFrame from a Numpy array and specify the index column and column headers, you can use the pd.DataFrame() constructor and pass in the Numpy array, as well as the index, columns parameters.
Finding and replacing elements in a list
Python
Here is a Python code snippet that demonstrates how to find and replace elements in a list:
Finding the index of an item in a list
Python
To find the index of an item in a list in Python, you can use the index() method of the list.
Get a list from Pandas DataFrame column headers
Python
You can use the DataFrame.columns attribute to access the column labels of a DataFrame as an Index object.
How to convert index of a pandas dataframe into a column
Python
To convert the index of a pandas DataFrame into a column, you can use the reset_index() function, and specify that you want to move the index to a new column with the inplace=True and name parameter.
How to get the position of a character in Python?
Python
You can use the index() method to get the position of a specific character in a string.
How to remove an element from a list by index
Python
To remove an element from a list by index in Python, you can use the pop() method.
Java - removing first character of a string
Java
To remove the first character of a string in Java, you can use the substring() method of the String class.
Pandas index column title or name
Python
To set the name of the index column in a pandas DataFrame, you can use the .rename_axis() method or the .index.name attribute.
Python Pandas: Get index of rows where column matches certain value
Python
You can use the .loc method to filter the DataFrame and get the boolean mask, and then use the .index property to get the index of the rows that match the certain value.
Python: finding an element in a list
Python
To find an element in a list, you can use the in keyword.
Set value for particular cell in pandas DataFrame using index
Python
In pandas, you can set the value of a specific cell in a DataFrame using the at method.