How do I get the row count of a Pandas DataFrame? Should I include the MIT licence of a library which I use from a CDN? Field name to join on. Indexes, including time indexes are ignored. To learn more, see our tips on writing great answers. AttributeError: module 'pandas' has no attribute 'dataframe' This error usually occurs for one of three reasons: 1. I am trying to merge 2 csv files. Would the reflected sun's radiation melt ice in LEO? See also Series.compare Compare with another Series and show differences. key rather than equal keys. Test whether two objects contain the same elements. is there a chinese version of ex. Centering layers in OpenLayers v4 after layer loading, Can I use a vintage derailleur adapter claw on a modern derailleur. I am trying merge multiple files based on a key ('r_id') and rename the column names in the output with the name of the files. How to filter Pandas dataframe using 'in' and 'not in' like in SQL, How to convert index of a pandas dataframe into a column, How to deal with SettingWithCopyWarning in Pandas. If True, allow matching with the same on value Considering certain columns is optional. Why is there a memory leak in this C++ program and how to solve it, given the constraints? is there a chinese version of ex. Find centralized, trusted content and collaborate around the technologies you use most. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. How does a fan in a turbofan engine suck air in? Asking for help, clarification, or responding to other answers. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, Thank You so much! Compare with another Series and show differences. The dataframes you have created using pd.read_csv aren't assigned to anything. Parallel jobs are easy to write in Spark. Field names to match on in the left DataFrame. rev2023.3.1.43269. In order to use the holoviews pandas extension with df.hviews methods, you must import hvplot.pandasbefore the dataframe is created, even if you are never going to use the hvplot.pandas module directly. Is lock-free synchronization always superior to synchronization using locks? Both the dataframes have equal number of columns but when i run this particular command in my notebook i get the following error must be given. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Does With(NoLock) help with query performance? For other URLs (e.g. Connect and share knowledge within a single location that is structured and easy to search. Thanks for contributing an answer to Stack Overflow! column label or sequence of labels, optional, {first, last, False}, default first. Should I include the MIT licence of a library which I use from a CDN? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. It is not renaming the column names using the file names. Not the answer you're looking for? Asking for help, clarification, or responding to other answers. Share Improve this answer Follow answered Feb 24, 2019 at 16:51 JahKnows 8,698 26 44 Add a comment 1 are ignored. AttributeError: module 'pandas' has no attribute 'dataframe' Solution Reason 1 - Ignoring the case of while creating DataFrame Reason 2 - Declaring the module name as a variable name Reason 3 - Naming file as pd.py or pandas.py Reason 4- Pandas package is not installed © 2023 pandas via NumFOCUS, Inc. How to apply a function to two columns of Pandas dataframe, How to drop rows of Pandas DataFrame whose value in a certain column is NaN. Specifies some hint on the current DataFrame. PySpark withColumnRenamed () Syntax: withColumnRenamed ( existingName, newNam) To install Spark on a linux system, follow this. rev2023.3.1.43269. you are actually referring to the attributes of the pandas dataframe and not the actual data and target column values like in sklearn. Can non-Muslims ride the Haramain high-speed train in Saudi Arabia? How did Dominion legally obtain text messages from Fox News hosts? Union[Any, Tuple[Any, ], List[Union[Any, Tuple[Any, ]]], None]. Does Cast a Spell make you a spellcaster? © 2023 pandas via NumFOCUS, Inc. as in example? 'DataFrame' object has no attribute 'assign' . on key is greater than or equal to the lefts key. (i.e., strictly less-than / strictly greater-than). I have the following error probably caused by the old version of Pandas. propagate forward. - False : Drop all duplicates. The value columns have 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. Only consider certain columns for identifying duplicates, by Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. The resulting index will be a MultiIndex with 'self' and 'other' stacked alternately at the inner level. be an index (x, a, b), {left, right, outer, inner}, default inner. Thanks for contributing an answer to Stack Overflow! How to increase the number of CPUs in my computer? Merge df1 and df2 on the lkey and rkey columns. @jezrael, Then better is some alternative, e.g. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Even yesterday this was generating the plots with the hovering annotations. If true, the result keeps values that are equal. Why are non-Western countries siding with China in the UN? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Indexes, including time indexes Help me understand the context behind the "It's okay to be white" question in a recent Rasmussen Poll, and what if anything might these results show? as in example? Merge two Pandas DataFrames on certain columns Article Contributed By : shuvamkumar2015 Has Microsoft lowered its Windows 11 eligibility criteria? Now new dataframe will also have the same CRS as one of the initial dataframes. You will have to use iris ['data'], iris ['target'] to access the column values if it is present in the data set. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. @DamioMartins It only merges the first columns of both dataframes. df1 has columns x1,x2,x3 The Boston housing has unintuitive column names. Merge DataFrame objects with a database-style join. Retrieve the current price of a ERC20 token from uniswap v2 router using web3js, Am I being scammed after paying almost $10,000 to a tree company not being able to withdraw my profit without paying a fee. Thanks for contributing an answer to Stack Overflow! To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Use the index of the left DataFrame as the join key. MultiIndex, the number of keys in the other DataFrame (either the index or a number of Considering certain columns is optional. Why 'dataframe' object has no attribute 'unique' Error comes? We will cover PySpark (Python + Apache Spark) because this will make the learning curve flatter. Why do we kill some animals but not others? You don't have to use the concat () method on the entire dataframe. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Does Cast a Spell make you a spellcaster? Are there conventions to indicate a new item in a list? There are no joining conditions just need to merge all the columns together. How do I check if an object has an attribute? Jordan's line about intimate parties in The Great Gatsby? 1 The function pd.read_csv () is already a DataFrame and thus that kind of object does not support calling .to_dataframe (). To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Please see fsspec and urllib for more How to create an empty PySpark DataFrame ? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, Because you are actually passing string :D What you need to do is find you csv file using your argument which is string and simply call, Good use of self-documenting variables. However, after the merge i am not able to find the new records in target directory. How to check whether a pandas DataFrame is empty? For other So what *is* the Latin word for chocolate? drop_firstbool, default False Connect and share knowledge within a single location that is structured and easy to search. Making statements based on opinion; back them up with references or personal experience. Stack Overflow. I want to merge two dataframes columns into one new dataframe. host, port, username, password, etc. It provides high-level APIs in Python, Scala, and Java. How to merge two arrays in JavaScript and de-duplicate items, Selecting multiple columns in a Pandas dataframe. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. One thing I would mention though, using, @G.Anderson yes you are right, i fixed it now, thanks you, AttributeError: 'str' object has no attribute 'merge', The open-source game engine youve been waiting for: Godot (Ep. These arrays are treated as if they are columns. I have installed the pyviz, panel and geoviews packages. You have to properly concatenate the two dataframes. For example, if we take a variable x we are assigned a value of 10. A backward search selects the last row in the right DataFrame whose This is similar to a left-join except that we match on nearest I am running this code to generate a choropleth map of landprices in Germany. The open-source game engine youve been waiting for: Godot (Ep. I could able to do every thing except renaming the output with the file . forward and nearest. Buffer to write to. Not the answer you're looking for? To remove duplicates and keep last occurrences, use keep. df2 has column x4 Can non-Muslims ride the Haramain high-speed train in Saudi Arabia? Thanks for contributing an answer to Stack Overflow! Ackermann Function without Recursion or Stack. How to iterate over rows in a DataFrame in Pandas. You can check the type of your variable ds using print (type (ds)), you will see that it is a pandas DataFrame type. Match on these columns before performing merge operation. {0 or index, 1 or columns}, default 1, Resulting differences are stacked vertically, Resulting differences are aligned horizontally. In addition to the standard DataFrame constructor arguments, GeoDataFrame also accepts the following keyword arguments: Parameters crsvalue (optional) Coordinate Reference System of the geometry objects. You can upsert data from a source table, view, or DataFrame into a target Delta table by using the MERGE SQL operation. DataFrame that shows the differences stacked side by side. To learn more, see our tips on writing great answers. Launching the CI/CD and R Collectives and community editing features for How do I merge two dictionaries in a single expression in Python? Because the variable is an integer type it does not support the append method. Joining two Pandas DataFrames using merge () Pandas - Merge two dataframes with different columns Merge two dataframes with same column names 8. How to react to a students panic attack in an oral exam? A DataFrame is similar to a table and supports functional-style (map/reduce/filter/etc.) but its using filenames as strings? How can the mass of an unstable composite particle become complex? Use the index of the right DataFrame as the join key. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, @MichaelDelgado Thanks for letting me know, I hope I have provided the necessary corrections, @VFox I've added that import to the question because people don't always read the comments, https://raw.githubusercontent.com/VolkaneicFox/IWH-Research/main/LandpriceFF_df.csv, hvplot.holoviz.org/user_guide/Plotting_Extensions.html, The open-source game engine youve been waiting for: Godot (Ep. Optionally match on equivalent keys with by before searching with on. How can I recognize one? Append data to an empty dataframe in PySpark, Python program to find number of days between two given dates, Python | Difference between two dates (in minutes) using datetime.timedelta() method, Python | Convert string to DateTime and vice-versa, Convert the column type from string to datetime format in Pandas dataframe, Adding new column to existing DataFrame in Pandas, Create a new column in Pandas DataFrame based on the existing columns, Python | Creating a Pandas dataframe column based on a given condition, Selecting rows in pandas DataFrame based on conditions, Get all rows in a Pandas DataFrame containing given substring, Python | Find position of a character in given string, replace() in Python to replace a substring, Python | Replace substring in list of strings, Python Replace Substrings from String List, How to get column names in Pandas dataframe. Launching the CI/CD and R Collectives and community editing features for How do I add a new column to a Spark DataFrame (using PySpark)? Because of using pandas.concat any geographical metadata such as CRS does not get preserved by default. DataFrame.equals Dealing with hard questions during a software developer interview, Book about a good dark lord, think "not Sauron". columns) must match the number of levels. What are examples of software that may be seriously affected by a time jump? AttributeError: partially initialized module 'pandas' has no attribute 'DataFrame' (most likely due to a circular import) It occurs may be due to one of the following reasons. The index of the resulting DataFrame will be one of the following: 0n if no index is used for merging Index of the left DataFrame if merged only on the index of the right DataFrame Index of the right DataFrame if merged only on the index of the left DataFrame You write pd.dataframe instead of pd.DataFrame 2. A nearest search selects the row in the right DataFrame whose on The file name is pd.py or pandas.py The following examples show how to resolve this error in each of these scenarios. As with pandas, when reading a GeoDataFrame in from disk, the extension must be loaded before the read is called (before the geopandas object is created - but not necessarily before the file was written). throws an error AttributeError: 'DataFrame' object has no attribute 'merge' Why was the nose gear of Concorde located so far aft? New in version 1.1.0. At what point of what we watch as the MCU movies the branching started? Save the Python file as pd.py or pandas.py. Asking for help, clarification, or responding to other answers. on key is less than or equal to the lefts key. Python Object Has No Attribute Manav Narula Apr-14, 2022 Python Python Object Python Python object has no attribute AttributeError Retrieve the current price of a ERC20 token from uniswap v2 router using web3js. Column names in the DataFrame to be encoded. I get the same AttributeError: 'numpy.ndarray' object has no attribute 'categories' after concatenating two dask dataframes with categorical columns. Print DataFrame in Markdown-friendly format. be an array or list of arrays of the length of the right DataFrame. Must be found in both DataFrames. Modify in place using non-NA values from another DataFrame. The default is backward and is compatible in versions below 0.20.0. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Raises ValueError When the two DataFrames don't have identical labels or shape. Integral with cosine in the denominator and undefined boundaries. backward (default), forward, or nearest, 0 2016-05-25 13:30:00.023 GOOG 720.50 720.93, 1 2016-05-25 13:30:00.023 MSFT 51.95 51.96, 2 2016-05-25 13:30:00.030 MSFT 51.97 51.98, 3 2016-05-25 13:30:00.041 MSFT 51.99 52.00, 4 2016-05-25 13:30:00.048 GOOG 720.50 720.93, 5 2016-05-25 13:30:00.049 AAPL 97.99 98.01, 6 2016-05-25 13:30:00.072 GOOG 720.50 720.88, 7 2016-05-25 13:30:00.075 MSFT 52.01 52.03, 0 2016-05-25 13:30:00.023 MSFT 51.95 75, 1 2016-05-25 13:30:00.038 MSFT 51.95 155, 2 2016-05-25 13:30:00.048 GOOG 720.77 100, 3 2016-05-25 13:30:00.048 GOOG 720.92 100, 4 2016-05-25 13:30:00.048 AAPL 98.00 100, time ticker price quantity bid ask, 0 2016-05-25 13:30:00.023 MSFT 51.95 75 51.95 51.96, 1 2016-05-25 13:30:00.038 MSFT 51.95 155 51.97 51.98, 2 2016-05-25 13:30:00.048 GOOG 720.77 100 720.50 720.93, 3 2016-05-25 13:30:00.048 GOOG 720.92 100 720.50 720.93, 4 2016-05-25 13:30:00.048 AAPL 98.00 100 NaN NaN, 1 2016-05-25 13:30:00.038 MSFT 51.95 155 NaN NaN, 0 2016-05-25 13:30:00.023 MSFT 51.95 75 NaN NaN, 2 2016-05-25 13:30:00.048 GOOG 720.77 100 NaN NaN, 3 2016-05-25 13:30:00.048 GOOG 720.92 100 NaN NaN. Can non-Muslims ride the Haramain high-speed train in Saudi Arabia? operations and SQL operations (select, project, aggregate). Hosted by OVHcloud. Also, check history of the table - it will say how many are inserted/updated/deleted, 'DataFrame' object has no attribute 'merge', The open-source game engine youve been waiting for: Godot (Ep. But, in spark both behave an equivalent and use DataFrame duplicate function to get rid of duplicate rows. with the merge index. Otherwise, only the ones with different values are kept. that will be clear now, that they are not file types, but just a string name of the files. What's the difference between a power rail and a signal line? How to check if df1 is equal to df2 in PySpark? 2. 1. Even yesterday this was generating the plots with the hovering annotations. A GeoDataFrame object is a pandas.DataFrame that has a column with geometry. If there are no overlapping columns, you should specify the order somehow for both tables. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. When the two DataFrames dont have identical labels or shape. xlsxwriter tfidf_dataframe.to_excel('tfidf_test.xlsx') Jupyter AttributeError: 'DataFrame' object has no attribute 'rename' Hello, I am doing the Data Science and Machine Learning course. I have written a pyspark.sql query as shown below. Delta Lake supports inserts, updates and deletes in MERGE, and it supports extended syntax beyond the SQL standards to facilitate advanced use cases. What does a search warrant actually look like? Easiest way to remove 3/16" drive rivets from a lower screen door hinge? I have tried df1.merge(df2) but no luck with this. For HTTP (S) URLs the key-value pairs are forwarded to urllib.request.Request as header options. What capacitance values do you recommend for decoupling capacitors in battery-powered circuits? DataFrame object has no attribute 'sort_values' How to fix AttributeError: 'Series' object has no attribute 'to_numpy' How to solve the Attribute error 'float' object has no attribute 'split' in python? starting with s3://, and gcs://) the key-value pairs are Easiest way to remove 3/16" drive rivets from a lower screen door hinge? To learn more, see our tips on writing great answers. How does a fan in a turbofan engine suck air in? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. That's because Spark does not know which line goes before which - rows are split into multiple nodes. Do German ministers decide themselves how to vote in EU decisions or do they have to follow a government line? Field name to join on in right DataFrame. Making statements based on opinion; back them up with references or personal experience. My first post here, so please let me know if I'm not following protocol. Is the Dragonborn's Breath Weapon from Fizban's Treasury of Dragons an attack? Why did the Soviets not shoot down US spy satellites during the Cold War? Change file1 = sys.argv [2] file2 = sys.argv [3] pd.read_csv (file1) pd.read_csv (file2) to file1 = pd.read_csv (sys.argv [2]) file2 = pd.read_csv (sys.argv [3]) Share Improve this answer ( Python + Apache Spark ) because this will make the learning curve.! X, a, b ), { first, last, False }, default 1, differences. Upsert data from a CDN will cover PySpark ( Python + Apache Spark ) this... Http ( S ) URLs the key-value pairs are forwarded to urllib.request.Request as header options a vintage derailleur adapter on... Dataframe as the join key rail and a signal line RSS feed, and... Breath Weapon from Fizban 's Treasury of Dragons an attack duplicates, by design! Do German ministers decide themselves how to merge two dataframes with different values are kept given the?... The two dataframes don & # x27 ; m not following protocol subscribe to this RSS,! Equivalent keys with by before searching with on an unstable composite particle become complex 11! Map/Reduce/Filter/Etc. DamioMartins it only merges the first columns of both dataframes DataFrame duplicate function to get rid of rows! Use from a CDN is already a DataFrame and not the actual and... With same column names Considering certain columns Article Contributed by: shuvamkumar2015 dataframe' object has no attribute merge.: Godot ( Ep function to get rid of duplicate rows with this match on equivalent keys with before. If an object has no attribute & # x27 ; t have to follow a government line join.... Technologies you use most I use from a CDN a power rail a... Mcu movies the branching started government line ; back them up with references or personal experience China in left. However, after the merge SQL operation the merge SQL operation to get rid of duplicate rows good dark,... Df1 and df2 on the lkey and rkey columns time jump software developer interview, Book about a good lord. And Java shoot down US spy satellites during the Cold War columns one... Lower screen door hinge below 0.20.0 dataframes columns into one new DataFrame my first Post here, So please me! First, last, False }, default False connect and share knowledge within single! Generating the plots with the file themselves how to check if an object has an attribute able... Can I use from a CDN please see fsspec and urllib for more how to check if object... ( S ) URLs the key-value pairs are forwarded to urllib.request.Request as header options Collectives and community editing for., last, False }, default inner Resulting differences are stacked vertically, Resulting differences aligned. Single expression in Python using locks this was generating the plots with same. X1, x2, x3 the Boston housing has unintuitive column names 8 shown below trusted content and collaborate the... { left, right, outer, inner }, default inner of service, privacy policy and policy. The differences stacked side by side geographical metadata such as CRS does not support the method... & copy 2023 Pandas via NumFOCUS, Inc. as in example GeoDataFrame object is a that! File types, but just a string name of the left DataFrame and R Collectives and editing! Concat ( ) paste this URL into your RSS reader ) because this will make the learning curve.! ) but no luck with this same column names using the file names aligned horizontally single expression in Python Scala. Time jump APIs in Python, Scala, and Java supports functional-style ( map/reduce/filter/etc. that is and... Text messages from Fox News hosts ( ) Syntax: withColumnRenamed ( ) ; DataFrame & # x27 ; not. And easy to search pairs are forwarded to urllib.request.Request as header options Pandas - merge two in... No overlapping columns, you agree to our terms of service, privacy policy and cookie policy from CDN! However, after the merge SQL operation clear now, that they are columns 's radiation melt ice LEO. Keep last occurrences, use keep you don & # x27 ; assign & # x27 ; be an (. Obtain text messages from Fox News hosts all the columns together default is backward and is compatible versions. Dealing with hard questions during a software developer interview, Book about a good dark lord think! Spark both behave an equivalent and use DataFrame duplicate function to get rid of duplicate rows layer... The function pd.read_csv ( ) Pandas - merge two dataframes columns into one new DataFrame generating plots! Non-Western countries siding with China in the UN its Windows 11 eligibility?. X, a, b ), { left, right, outer, inner }, default.. Its Windows 11 eligibility criteria will cover PySpark ( Python + Apache )! Order somehow for both tables of what we watch as the MCU movies the branching started learning! The index of the right DataFrame as the MCU movies the branching started a good lord. In target directory like in sklearn during a software developer interview, Book about a good dark lord, ``... To find the new records in target directory same column names overlapping columns, you agree to our of. Dataframes you have created using pd.read_csv are n't assigned to anything be seriously affected a... Pd.Read_Csv are n't assigned to anything and collaborate around the technologies you use most, b ), {,. Columns, you agree to our terms of service, privacy policy and policy. Of both dataframes with cosine in the UN the Boston housing has unintuitive column names comment 1 are.! Based on opinion ; back them up with references or personal experience show differences do... Openlayers v4 after layer loading, can I use from a CDN cover PySpark ( Python + Spark. 3/16 '' drive rivets from a CDN we kill some animals but not?. An attribute @ jezrael, Then better is some alternative, e.g are file. I am not able to find the new records in target directory paste. Or shape Dominion legally obtain text messages from Fox News hosts is structured and to. Single expression in Python use the index of the right DataFrame fan in a list just need merge... Into multiple nodes into a target Delta table by using the file (. Or equal to the attributes of the files fan in a turbofan engine suck air in cover... Not Sauron '' are no overlapping columns, you agree to our terms of service, privacy policy and policy! The plots with the same on value Considering certain columns is optional geoviews packages we will cover (... X27 ; assign & # x27 ; assign & # x27 ; t have to follow a government?! Table and supports functional-style ( map/reduce/filter/etc. PySpark ( Python + Apache ). '' drive rivets from a CDN DataFrame in Pandas been waiting for: Godot ( Ep a modern.... Apis in dataframe' object has no attribute merge, Scala, and Java support the append method, project, aggregate ) compatible! Left, right, outer, inner }, default False connect and share knowledge within a single that... But not others of software that may be seriously affected by a jump... Community editing features for how do I merge two dataframes with same column names 8 down. Some animals but not others x27 ; m not following protocol key is less than or to! The Latin word for chocolate PySpark withColumnRenamed ( existingName, newNam ) to install Spark a. Would the reflected sun 's radiation melt ice in LEO ( S ) URLs key-value... That kind of object does not support calling.to_dataframe ( ) method on the and! There are no overlapping columns, you should specify the order somehow for both tables developer,. Cold War { left, right, outer, inner }, default inner urllib.request.Request as header options: (. Value of 10 site design / logo 2023 Stack Exchange Inc ; user contributions licensed CC... Are ignored is compatible in versions below 0.20.0 use from a CDN based on opinion back... Query performance a value of 10 Contributed by: shuvamkumar2015 has Microsoft lowered its Windows 11 eligibility criteria of. Seriously affected by a time jump point of what we watch as the key. If they are not file types, but just a string name of the DataFrame... Data and target column values like in sklearn, outer, inner }, default first this RSS feed copy. Dataframe will also have the following error probably caused by the old of... ; assign & # dataframe' object has no attribute merge ; t have to use the concat )! Df1 has columns x1, x2, x3 the Boston housing has column. Layers in OpenLayers v4 after layer loading, can I use a vintage derailleur adapter claw on linux... With geometry DataFrame in Pandas include the MIT licence of a library which use! Licensed under CC BY-SA to search have installed the pyviz, panel and geoviews.. Drive rivets from a CDN multiple columns in a turbofan engine suck air in RSS.... Ice in LEO difference between a power rail and a signal line lower... Outer, inner }, default first countries siding with China in the left as... Does with ( NoLock ) help with query performance Inc. as in example, or responding to other answers the. In versions below 0.20.0 turbofan engine suck air in difference between a power rail a. To match on in the UN power rail and a signal line not the actual data and column! And is compatible in versions below 0.20.0 curve flatter vintage derailleur adapter claw on a linux system, follow.... Here, So please let me know if I & # x27 ; t have follow! Of both dataframes the append method duplicate function to get rid of duplicate.! Can upsert data from a CDN what we watch as the join key C++ program and how dataframe' object has no attribute merge solve,...
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