dataframe column to list

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I think you needs a (smaller) toy example, with the desired result. The last step is to iteratively apply our new function recode_df () to our nested data.frame dat_ls. In any language. WebAdd column in dataframe from list Ask Question Asked 8 years, 8 months ago Modified 2 years, 5 months ago Viewed 512k times 166 I have a dataframe with some columns like this: A B C 0 4 5 6 7 7 6 5 The possible range of values in A are only from 0 to 7. Find centralized, trusted content and collaborate around the technologies you use most. Statology Study is the ultimate online statistics study guide that helps you study and practice all of the core concepts taught in any elementary statistics course and makes your life so much easier as a student. Connect and share knowledge within a single location that is structured and easy to search. column Pandas DataFrame columns are Pandas Series when you pull them out, which you can then call x.tolist() on to turn them into a Python list. Web24 Answers Sorted by: 1986 You can get the values as a list by doing: list (my_dataframe.columns.values) Also you can simply use (as shown in Ed Chum's answer ): list (my_dataframe) Share Follow edited Oct 22, 2021 at 12:16 Peter Mortensen 30.9k 21 105 131 answered Oct 20, 2013 at 21:23 DataFrame to List Creating the DataFrame Python3 import pandas as pd data = pd.read_csv ("nba.csv") df = data.head (5) df Output: Get a list of a specified column of a Connect and share knowledge within a single location that is structured and easy to search. DATA TO FISHPrivacy PolicyCookie PolicyTerms of ServiceCopyright | All rights reserved, How to Convert Integers to Datetime in Pandas DataFrame, How to Create a Table in SQL Server using Python. How to Convert Pandas DataFrame into a List column This returns a numpy array of unique values: You can also use numpy to get the unique values, although there are differences between the two methods: Numpy Array -> Panda Data Frame -> List from one Panda Column, Convert numpy array into Panda data frame, update: toList() does not work. Method 1: Convert Column to List Using tolist () The following code shows how to use the tolist () function to convert the points column in the DataFrame to a list: #convert column to list my_list = df ['points'].tolist() #view list print(my_list) [99, 90, 93, 86, 88, 82] We can confirm that the result is a list by using the type () function: DataFrame column to list Not the answer you're looking for? Pandas DataFrame to List of Lists Ask Question Asked 8 years, 5 months ago Modified 6 months ago Viewed 230k times 188 It's easy to turn a list of lists into a pandas dataframe: import pandas as pd df = pd.DataFrame ( [ [1,2,3], [3,4,5]]) But how do I turn df back into a list of lists? SO has turned into some kind of F(*& nanny state. The loop was not a very good example. The columns= argument takes a list-like object, passing in column headers in the order in which the columns are created. Teams. How to Convert Pandas DataFrame into a List How do I extract elements from a list in a pandas dataframe column? Can Visa, Mastercard credit/debit cards be used to receive online payments? Is speaking the country's language fluently regarded favorably when applying for a Schengen visa? as pointed out by cs95 other methods should be preferred over pandas .values attribute from pandas version 0.24 on see here. [duplicate] (8 answers) Get list from pandas dataframe column or row? In this article, we will discuss how to get a list of specified column of a Pandas Dataframe. 587), The Overflow #185: The hardest part of software is requirements, Starting the Prompt Design Site: A New Home in our Stack Exchange Neighborhood, Temporary policy: Generative AI (e.g., ChatGPT) is banned, Testing native, sponsored banner ads on Stack Overflow (starting July 6), How to deal with SettingWithCopyWarning in Pandas, Append a new column list of values in PySpark, Pandas DataFrame - Fill NaNs of columns based on values of other columns, Adding a new column to DataFrame with different values in different row, Creating a df from a list created from another df, Need to compare data of 5000 houses to the top 5000 rows of original dataset, Appending integers from a list to each row to a new dataframe column, Adding column to pandas DataFrame containing list of other columns' values, Append new column to df from list using python, Adding a column of list to a dataframe python, Adding column to pandas dataframe taking values from list in other column, Add a list in to a pandas data frame column. why isn't the aleph fixed point the largest cardinal number? Finally, we use dplyr::across () on all_of the columns in cols_vec and supply the current column x and the current dictionary cur_dat_dict to recode_col2 (). In case you wanted to get the index column as a list use DataFrame.index.tolist() method. What does "Splitting the throttles" mean? Can the Secret Service arrest someone who uses an illegal drug inside of the White House? As this question attained a lot of attention and there are several ways to fulfill your task, let me present several options. Method 1: Convert Column to List Using tolist () The following code shows how to use the tolist () function to convert the points column in the DataFrame to a list: #convert column to list my_list = df ['points'].tolist() #view list print(my_list) [99, 90, 93, 86, 88, 82] We can confirm that the result is a list by using the type () function: By my reading the issue is constructing. Teams. print lol # [ [1,2,3], [3,4,5]] python Making statements based on opinion; back them up with references or personal experience. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Connect and share knowledge within a single location that is structured and easy to search. Learn more about Collectives. df [Courses] returns the DataFrame column as a Series and then use values.tolist () to convert the column values to list. Is there a deep meaning to the fact that the particle, in a literary context, can be used in place of . WebAdd column in dataframe from list Ask Question Asked 8 years, 8 months ago Modified 2 years, 5 months ago Viewed 512k times 166 I have a dataframe with some columns like this: A B C 0 4 5 6 7 7 6 5 The possible range of values in A are only from 0 to 7. list rev2023.7.7.43526. (Ep. 2,243 2 19 26 this answer may be useful, if you want to assign a list to an existing dataframe. Syntax: as.list ( object ) Parameter: Dataframe object in our case Pandas DataFrame to List of Lists Ask Question Asked 8 years, 5 months ago Modified 6 months ago Viewed 230k times 188 It's easy to turn a list of lists into a pandas dataframe: import pandas as pd df = pd.DataFrame ( [ [1,2,3], [3,4,5]]) But how do I turn df back into a list of lists? Pandas DataFrame Convert the list to a series or array and then assign: IIUC, if you make your (unfortunately named) List into an ndarray, you can simply index into it naturally. List If you want to use index instead of column names (e.g. In the following example we will position the new column in the first position from left (by setting loc=0). # DataFrame column to list What is the grammatical basis for understanding in Psalm 2:7 differently than Psalm 22:1? Lets re-create our dataframe and specify a column name: import pandas as pd names = [ 'Katie', 'Nik', 'James', 'Evan' ] df = pd.DataFrame (names, columns= [ 'Name' ]) print (df) Create free Team. Is a dropper post a good solution for sharing a bike between two riders? The below example gets the values of a column Discount as a list. Pandas: Convert a dataframe column Your email address will not be published. Not the answer you're looking for? The following tutorials explain how to perform other common tasks in R: How to Convert Matrix to Data Frame in R Things have improved now. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. print lol # [ [1,2,3], [3,4,5]] python Pandas DataFrame What would stop a large spaceship from looking like a flying brick? Well, I can't speak for the nannies, but you'll find that your approach is about an order of magnitude slower on long arrays. It sounds a little vague atm. We can use the class() function to confirm that points_list is indeed a list: We can use the following code to convert each column in the data frame to a list: We can also use brackets [ ] to extract a specific column as a list: The output displays the first column in the data frame (team) as a list. Making statements based on opinion; back them up with references or personal experience. Connect and share knowledge within a single location that is structured and easy to search. df[Courses] returns the DataFrame column as a Series and then use values.tolist() to convert the column values to list. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing, Using an index is an overkill as it's not needed to iterate over columns. However, personally, I sometimes find it more practical or intuitive to work with indices/numbers instead of column names. and then it was rejected because it was too fast. Method #1: Converting a DataFrame to List containing all the rows of a particular column: Python3 import pandas as pd data = {'Name': ['Tony', 'Steve', 'Bruce', 'Peter' ] , 'Age': [35, 70, 45, 20] } df = pd.DataFrame (data) names = df ['Name'].tolist () print(names) Output: ['Tony', 'Steve', 'Bruce', 'Peter'] For more info: This can be simplified to: df['new_col'] = pd.Series(mylist).values. Pandas: Create a Dataframe from Lists (5 Ways The resulting dataframe would look like this: Note: The dataframe is huge and iteration is the last option option. Q&A for work. (11 answers) Closed 4 years lol = df.what_to_do_now? Hi @DSM. .The answers are 1 and 1. Not included here but the graphs for float and bool dtype columns were very similar to that of the int dtype column shown here. Columns These objects can be Vectors, Matrices, Factors, and data frames. Brute force open problems in graph theory, Relativistic time dilation and the biological process of aging, Non-definability of graph 3-colorability in first-order logic. If you have a column index and wanted to get the column values of an index, first you have to get the column name by index and then use the approaches explained above to convert it to a list. How to Convert Pandas DataFrame into a List The columns= argument takes a list-like object, passing in column headers in the order in which the columns are created. lol = df.what_to_do_now? Asking for help, clarification, or responding to other answers. If we look at the source code of .tolist(), under the hood, list() function is being called on the underlying data in the dataframe, so both should produce the same output.