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Questions tagged [csv]

Comma-Separated Values are a list of plain text values delimited by commas, or a file containing one or more lists in that format.

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12 views

Deriving columns and filling them with existing data of the column values

hello guys need help in solving the problem, in the given image I have a column named as the filename which has more than 10000 rows basically there are CSV file names. I want to create columns based ...
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0answers
2 views

np.loadtxt() cannot convert str to float error [migrated]

I am attempting to work with the np.loadtxt() method. (note: please do not recommend using something else as I am required to use this.) I have only 1 header, so I am skipping it via the "skiprows=1" ...
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1answer
47 views

How to save API data into CSV format?

Is there an easy way to convert API data with python commands and output the results in CSV format? Here's what I'm doing now: ...
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1answer
46 views

how to see in pandas the element of a csv table with many columns (>30) which the names of its columns is more than 10 character?

how to see in pandas the element of a csv table with many columns (>25) which the names of its columns is more than 10 character? I have 5000 rows and 32 columns and the label of some columns are more ...
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1answer
26 views

How to create a parquet file from a query to a mysql table

Updating a legacy ~ETL; on it's base it exports some tables of the prod DB to s3, the export contains a query. The export process generates a csv file using the following logic: ...
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1answer
99 views

Pandas - how to make further sub-groups after groupby( ) and get_group( )

Sample data in .csv format ...
2
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1answer
222 views

Any one read the over 100gb csv file and successfully concatenation?

I have been searching for the deal with large CSV file read method Its over 100gb and need to know how deal with the chunk file processing and make concatenation faster ...
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0answers
20 views

pd.read_csv() not reading /tmp folder AWS Lambda

I am using AWS Lambda to download a CSV from S3 and then upload each recod to a mongo. I download the csv to /tmp folder using the boto3 client and with pandas read it with pd.read_csv(). However the ...
2
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2answers
73 views

File format where column names are repeated on each row

I have received a dataset in text file with the following format ...
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1answer
126 views

Getting stock data in a discipline manner from Yahoo finance

I used the below code for downloading stock data from yahoo finance:- ...
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0answers
111 views

Python data cleaning for CSV using Pandas and PySpark and mapping to JSON in AWS ETL Glue Environment

I have recently started working on some ETL work and wanted some guidance in this area related to data cleaning from CSV to JSON mapping using AWS Glue, Python (pandas, pyspark). Question Need a ...
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1answer
1k views

np.loadtxt function showing error, could not convert string to float: '“Date”'

This is my stock market csv data: ...
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2answers
40 views

Removing # from header

I have a $(418,2)$ matrix and I want to convert it to csv. so I write: np.savetxt('titanic1.csv', Sol, fmt='%.2f', delimiter=",",header="PassengerId,Survived") ...
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1answer
910 views

File converter: from CSV to HDF5

Can anyone recommend any command line tool for converting large CSV file into HDF5 format?
2
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1answer
67 views

Processing csv file with more than 700K rows of data

I have a .csv file (around 400MB in size) which contains 700K rows of structured data. Table structure is: ...
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1answer
1k views

Pandas throwing “Error tokenizing data. C error” while loading data sets from URL

I am trying to work on the Titanic competition to get hands on experience with data science & machine learning. I tried to load up the datasets from GitHub but pandas threw the following error: <...
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2answers
41 views

How to calculate occurance of a name per hour basis of monthly csv data using python

I have csv file which have DateTime and application OS name. DateTime have for 1 month ,per hour basis. The csv looks as follows, ...
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0answers
25 views

Complex Value Neural Network with .csv

This is the part of my program in python: Path of input data and output data for learning. ...
2
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1answer
2k views

how to transform a folder of images into csv file?

I have a data set for segmentation project. The dataset have 2 folders containing train folder and annotated_train_data folder, both folders have images. input and label both are images. I want to ...
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1answer
42 views

Extract or subset hundreds of columns from a data frame

I need to extract many columns from a dataset. I have a very large csv file with thousands of columns and rows, and I read it into R using: ...
5
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2answers
21k views

ValueError: could not convert string to float: '���'

I have a (2M, 23) dimensional numpy array X. It has a dtype of <U26, i.e. unicode string ...
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3answers
802 views

What is a good way to store processed CSV data to train model in Python?

I have about 100MB of CSV data that is cleaned and used for training in Keras stored as Panda DataFrame. What is a good (simple) way of saving it for fast reads? I don't need to query or load part of ...
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1answer
250 views

Whole time column in csv file convert into UTC (epoch) using python

I have a datset with time and column. I want to plot a graph with time and value. I tried many methods but didn't come proper graph. Because I have a time series. Then I thought I will convert time ...
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0answers
105 views

How to plot graph including y axis =value and x axis = datetime with timedelta (2 hrs) reading from csv file using python?

I have dataset import from csv file. Here I want to plot graph with datetime including time delta (two hours). In x axis datetime should be visible like %d/%m/%Y %H:%M. y is value. I wrote the code ...
2
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1answer
284 views

day is out of range for month import from csv file in python

Here I have one csv file with different values and date_time. I wrote the code and run it. Then it gave me an error time data '8/6/2018 6:45' does not match format ' %d/%m/%Y %H:%M:%S' I want to plot ...
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0answers
21 views

Repeated groups of columns in data analysis

I have a got a medical records for analysis, which have repeated groups of columns holding information about the medicines taken. The records are initially stored as an Excel table, having multiple ...
1
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0answers
161 views

alternatives to pyspark to query a csv file locally (no distributed computation needed)

I am reading a csv file with pyspark to extract some information from it. I am running pyspark locally and I do not need distributed computation. On the contrary I need some plotting library such as ...
2
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2answers
3k views

How to transform a folder of images in a csv file

I have a folder with a lot of images that I want to use to bild a classificator using a SVM model in python with sklearn. I've always used csv file as train/test set with sklearn, how can I make it? (...
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2answers
1k views

how to take CSV file input in list of tuples

I have a .txt(data.txt) file containing csv data like: X Class 15.0001 Yes 18.00 NO 17.07 Yes I need to make a function to return a list of ...
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1answer
484 views

Find ID for the name in the list from csv file in python [closed]

The CSV file contains: ID,Name 1,AS 2,er 3,rtf 4,addfs The list contains the name for example (er,rtf) I want to find the ID's corresponding to these names mentioned above How to find the ID's using ...
2
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1answer
41 views

Creating a single number from a numpy array - Python [closed]

I am working on a gender classification project. I am extracting the pixels of an image using a Numpy array in Python, similar to the one below: ...
1
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2answers
23 views

Any tool to load large csv files quickly on windows 7

I am working with relatively large CSV files (1.5 MB+) and while testing the code, I have to frequently open up the CSV files to read a particular row, validate the data are there and then close the ...
3
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6answers
59k views

I got the following error : 'DataFrame' object has no attribute 'data'

I am trying to get the 'data' and the 'target' of the iris setosa database, but I can't. For example, when I load the iris setosa directly from sklearn datasets I get a good result: Program: ...
3
votes
1answer
17k views

How to store strings in CSV with new line characters?

My question is: what are ways I can store strings in a CSV that contain newline characters (i.e. \n), where each data point is in one line? Sample data This is a ...
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2answers
17k views

Search and Replace in specific column of csv with python

I created a program that search and replaces over an entire csv file but I need to make so it is column specific. Is there a way to only search via a column. Here is my code, I am pretty new to python ...
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1answer
259 views

Data scraping & NLP?

I'm scraping data from Bing search results for (non-commercial purposes, of course) on Python using BeautifulSoup. I've entered an Indian dessert name, called 'rasmalai' as the word that I am focusing ...
0
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1answer
223 views

How can I transpose a high dimensional dataset?

I have a (.csv) file with more than 35,000 rows and 100 columns, where the rows represent the attributes and columns represent the instances. In Excel the maximum number of columns is 16,384. ...
0
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1answer
4k views

Orange: Data has no target variable error

I am trying to apply Random Forest algorithm on a data set using Orange. The target variable is not set in the data set. However, I know which column is the target variable. How can I specify the ...
1
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3answers
1k views

Creating data model out of .csv file using Python

I want to create a data model out of a .csv file using Python. I mean to create dependencies, for example the primary key and stuff such that I can check if the new ...
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1answer
3k views

I have a csv file with time as the datetime format and want to edit the same column into miliseconds, how do I change that?

Input file is : time event earthAcceleration.x earthAcceleration.y earthAcceleration.z 2017-11-22T09:20:13.944 motion -0.006379993 -0.001029071 -0.010781396 2017-11-22T09:20:13.954 motion 0....
2
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2answers
1k views

How to deal with large data sets

So i'm very new to this, forgive my silly questions. I've got some data I need to analyse, I would usually just use excel it doesnt seem to be able to do the job. I have .csv files containing data ...
0
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2answers
10k views

Python inserts newline by writing to csv

I am trying to scrape http://www.the-numbers.com/movie/budgets/all but when I write the table into a csv file, there is an additional line with the counter index written in between each movie row... ...
0
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1answer
14k views

Converting Json file to Dataframe Python

I have a json file which has multiple events, each event starts with EventVersion Key. The data looks similar to the following synthesized data. ...
1
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1answer
489 views

R: reading big data files in R

In R, there are libraries which help speed up the process of reading huge data files. Examples of these libraries include sqldf and ff. What would be the disadvantage of using these packages to read ...
2
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2answers
484 views

Breaking down a column in Pandas into a separate CSV for display in Tableau

My data is coming from a CSV, which should be visualized in Tableau. However, the data contains the column category_list, which consists of values separated by a ...
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1answer
2k views

How to shift rows values as columns in pandas?

Input: I have csv file like below as input.... ...
3
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1answer
858 views

ML algorithm for determining CSV file header names based on content

I have a large amount of CSV files, an example of which (for job titles) is listed below. The data is noisy (there are misspellings, difference in capitalisation, missing values, and they are not well-...
1
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1answer
2k views

Output data from scikit learn logistic regression

I have run a logistic regression using scikit learn in python. I know want to output the results to put into a csv and then load into Tableau. To do that I need to combine the y_test, y_actual, and ...
0
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2answers
5k views

Python - AttributeError: type object 'DataFrame' has no attribute 'read_csv'

I'm trying to create some charts using Python. I've this dataset in a CSV file: Banana Water Rice Rice Water Bread Banana Juice And I've this code: <...
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3answers
6k views

importing csv data in python

I have a csv file with around 130 columns and 6000 rows what is the best way to import them into python, so that I can later use them in a classification algorithm(columns are the labels and rows are ...