Python | Pandas DataFrame.reset_index ()

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Pandas reset_index() — it is a method to reset the index of a data frame. The .reset_index () method sets a list of integers ranging from 0 to the length of the data as the index.

Syntax:
DataFrame..reset_index (level = None, drop = False, inplace = False, col_level = 0, col_fill = ‚")

Parameters:
level: int, string or a list to select and remove passed column from index.
drop: Boolean value, Adds the replaced index column to the data if False.
inplace: Boolean value, make changes in the original data frame itself if True.
col_level: Select in which column level to insert the labels.
col_fill: Object, to determine how the other levels are named.

Return type: DataFrame

To load the CSV file you are using, press here.

Example # 1: Resetting the index
In this example, to reset the index, the Name column was first set as the column index, and then a new index was created using the reset index.

# import pandas package

import pandas as pd


# create data frame from CSV file

data = pd.read_csv ( "employees.csv" )


# set name as index column

data.set_index ([ "First Name" ], inplace = True ,

append = True , drop = True )


# reset index

data. .reset_index (inplace = True )


# display
data.head ( )

Output:
As shown in the output images, a new index mark was created called level_0.

Before reset —

After reset —

Example # 2: Working with a multilevel index
In this example, 2 columns (Name and Gender) are added to the index column and then one level is removed using the .reset_index () method.

# import pandas package

import pandas as pd


# create data frame from CSV file

data = pd.read_csv ( "employees.csv" )


# set name as index column

data.set_index ([ "First Name" , "Gender" ], inplace = True ,

append = True , drop = True )


# reset index

data..reset_index (level = 2 , inplace = True , col_level = 1 )


# display
d ata.head ()

Output:
As shown in the output image, the floor column in the index column was replaced because its level was 2.

Before reset —

After reset —

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How to insert newlines on argparse help text?

5 answers

I"m using argparse in Python 2.7 for parsing input options. One of my options is a multiple choice. I want to make a list in its help text, e.g.

from argparse import ArgumentParser

parser = ArgumentParser(description="test")

parser.add_argument("-g", choices=["a", "b", "g", "d", "e"], default="a",
    help="Some option, where
"
         " a = alpha
"
         " b = beta
"
         " g = gamma
"
         " d = delta
"
         " e = epsilon")

parser.parse_args()

However, argparse strips all newlines and consecutive spaces. The result looks like

~/Downloads:52$ python2.7 x.py -h
usage: x.py [-h] [-g {a,b,g,d,e}]

test

optional arguments:
  -h, --help      show this help message and exit
  -g {a,b,g,d,e}  Some option, where a = alpha b = beta g = gamma d = delta e
                  = epsilon

How to insert newlines in the help text?

406

Answer #1

Try using RawTextHelpFormatter:

from argparse import RawTextHelpFormatter
parser = ArgumentParser(description="test", formatter_class=RawTextHelpFormatter)

Is a Python list guaranteed to have its elements stay in the order they are inserted in?

5 answers

If I have the following Python code

>>> x = []
>>> x = x + [1]
>>> x = x + [2]
>>> x = x + [3]
>>> x
[1, 2, 3]

Will x be guaranteed to always be [1,2,3], or are other orderings of the interim elements possible?

366

Answer #1

Yes, the order of elements in a python list is persistent.

Inserting image into IPython notebook markdown

5 answers

I am starting to depend heavily on the IPython notebook app to develop and document algorithms. It is awesome; but there is something that seems like it should be possible, but I can"t figure out how to do it:

I would like to insert a local image into my (local) IPython notebook markdown to aid in documenting an algorithm. I know enough to add something like <img src="image.png"> to the markdown, but that is about as far as my knowledge goes. I assume I could put the image in the directory represented by 127.0.0.1:8888 (or some subdirectory) to be able to access it, but I can"t figure out where that directory is. (I"m working on a mac.) So, is it possible to do what I"m trying to do without too much trouble?

277

Answer #1

Most of the answers given so far go in the wrong direction, suggesting to load additional libraries and use the code instead of markup. In Ipython/Jupyter Notebooks it is very simple. Make sure the cell is indeed in markup and to display a image use:

![alt text](imagename.png "Title")

Further advantage compared to the other methods proposed is that you can display all common file formats including jpg, png, and gif (animations).

We hope this article has helped you to resolve the problem. Apart from Python | Pandas DataFrame.reset_index (), check other floor-related topics.

Want to excel in Python? See our review of the best Python online courses 2022. If you are interested in Data Science, check also how to learn programming in R.

By the way, this material is also available in other languages:



Marie Porretti

Berlin | 2022-12-01

Simply put and clear. Thank you for sharing. Python | Pandas DataFrame.reset_index () and other issues with reset index was always my weak point 😁. Checked yesterday, it works!

Olivia Schteiner

Milan | 2022-12-01

I was preparing for my coding interview, thanks for clarifying this - Python | Pandas DataFrame.reset_index () in Python is not the simplest one. Will use it in my bachelor thesis

Ken OConnell

San Francisco | 2022-12-01

Simply put and clear. Thank you for sharing. Python | Pandas DataFrame.reset_index () and other issues with insert was always my weak point 😁. Will use it in my bachelor thesis

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