# How do I sort column names in pandas?

## How do I sort column names in pandas?

To **sort** a DataFrame based on **column names** in descending Order, we can call sort_index() on the DataFrame object with argument axis=1 and ascending=False i.e.

## How do I reorder rows in a Dataframe in R?

**Reorder Data Frame Rows** in **R**

- Sort a
**data frame rows**in ascending order (from low to high) using the**R**function**arrange**() [dplyr package] - Sort
**rows**in descending order (from high to low) using**arrange**() in combination with the function desc() [dplyr package]

## How do you arrange Dataframe in descending order?

To **sort** a **dataframe** based on the values of a column but in **descending order** so that the largest values of the column are at the top, we can use the argument **ascending**=False.

## How do you sort in ascending order pandas?

**By Label**

**Order**of**Sorting**. By passing the Boolean value to**ascending**parameter, the**order**of the**sorting**can be controlled. ...**Sort**the Columns. By passing the axis argument with a value 0 or 1, the**sorting**can be done on the column labels. ...- By Value. Like index
**sorting**, sort_values() is the method for**sorting**by values.

## How do I rename a level in R?

It's possible to **rename** factor **levels** by name (without plyr), but keep in mind that this works only if ALL **levels** are present in the list; if any are not in the list, they will be replaced with NA . It's also possible to use **R's** string search-and-replace functions to **rename** factor **levels**.

## How do I convert an integer to a factor in R?

In **R**, you can **convert** multiple numeric variables to **factor** using lapply function. The lapply function is a part of apply family of functions. They perform multiple iterations (loops) in **R**. In **R**, categorical variables need to be set as **factor** variables.

## How do I add a column name to a DataFrame?

You can use the rename() method of pandas. **DataFrame** to **change column** / index **name** individually. Specify the original **name** and the new **name** in dict like {original **name**: new **name**} to **columns** / index argument of rename() . **columns** is for the **columns name** and index is for index **name**.

## How do I create a column index in pandas?

To set a **column** as **index** for a **DataFrame**, use **DataFrame**. set_index() function, with the **column** name passed as argument. You can also setup MultiIndex with multiple **columns** in the **index**. In this case, pass the array of **column** names required for **index**, to set_index() method.

## How do I add a column to a Pandas DataFrame?

Another method to **add** a **column** to **DataFrame** is using the assign() method of the **Pandas** library. This method uses a different approach to **add** a new **column** to the existing **DataFrame**. **Dataframe**. assign() will create a new **DataFrame** along with a **column**.

## How do I add a column to a list in pandas?

**DataFrame.** **assign()**

- Create DataFrame using a dictionary.
- Create a
**list**containing new**column**data. Make sure that the length of the**list**matches the length of the data which is already present in the data frame. **Insert**the data into the DataFrame using DataFrame. assign(column_name = data) method.

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