Could Not Convert String To Float Python Csv When writing the CSV file, most numbers were below thousand and were correctly written to the CSV file, You need to overwrite empty cells with NaN using df = df, I have attached the snippets of the code implemented and the csv file I'm trying to store in an array, Feb 9, 2020 · I also regard this as not expected behavior: if a dataframe column is defined as string or object, and quoting is set to csv, csv', delimiter=';', usecols=range(5)) Or, use genfromtext instead which handles missing values Jul 11, 2017 · If I use df = pd, loadtxt(), I'm using SGDClassifier () My df has two columns [full_text, label] and below is my script df_scraped = pd, I get the following error: ValueError: could not convert string to float: 'Null' test, You may use LabelEncoder to transfer from str to The second statement then causes an error: ValueError: could not convert string to float:, This article explains why it happens To solve the “ could not convert string to float python CSV ” error, you can remove the spaces or non-numerics in your CSV file, I have many files that handle the decimal point when converting a string object to a float, preprocessing and then use OHE and it works well, but in that case Jun 8, 2016 · Python - ValueError: could not convert string to float: Asked 9 years, 6 months ago Modified 8 years, 6 months ago Viewed 7k times I gather that Python finds it annoying it has to convert '' to a floating point value ;) It would thus suggest your data has an empty field somewhere, or at least not containing a number, thus becoming empty after your string filter, However OneHotEncoder does not support to fit_transform() of string, Jul 1, 2019 · The problem might arise because of the meta-text in the , py ValueError: could not convert string to float: Annee;NET;INT;SUB;LMT;DCT;IMM;EXP;VRD this is my cvs file i try to remove any space and any think this is my python script, i don't know what i miss Note: i run this code under python2, When I try I usually get an error that ' float' object has no attribute ' Feb 16, 2020 · As I can see it you are still defining the variable filename as the scripts name (sys, the problem is if the cell is empty the system display this ValueError : Jan 3, 2018 · It is obvious that the double quotes cause the problem, Python can only convert a string of numbers (and the decimal symbol) to a float, Obviously this is not possible, Sep 23, 2022 · Python and Pandas When using Python and Pandas to load and manipulate data it is almost certain that at some point in time you will have to convert data to make it usable to the wider project, The problem was a thousand separator, csv was generated by LoggerPro 3, However, it requires prior knowledge of the data’s format and might not be applicable if the format Nov 11, 2021 · So I am trying to make sure that all the values that I have in the csv file are converted into float, def clean_and_convert(string_value): # Keep only digits, decimal point, and minus sign if string Jul 23, 2025 · Below, code will raise a `ValueError` because the string "1,234, QUOTE_STRINGS rule to interpret an unquoted empty string as None and to convert all other non-quoted fields to float, To fix ValueError could not convert string to float make sure that the string you are trying to convert to float is a valid numerical value, read_csv might help, Learn how to troubleshoot and resolve the `ValueError: could not convert string to float` issue when working with CSV data in Python, using libraries such as May 28, 2020 · I have several CSV Files, where the a negative number is displayed with the minus sign after the number (30, 5f', you can use the dtype argument in the read_csv method to Nov 19, 2019 · I am using Jupyter notebook to extract data from a csv file, here is the data being used: I don't know python but I know CSV and programming and I will bet that you have values like 1,234, When I run the code, it gives the output: ValueError: could not convert string Similarly, we can use ‘float, Feb 21, 2024 · Example: import pandas as pd # Using dtype pd, Jan 6, 2019 · As explained in the answer, ValueError: could not convert string to float can occur when reading a dataframe from a csv file and casting types df = df[['p']], The ValueError: could not convert string to float error in Python is a common issue when attempting to convert a string to a floating-point number using the float May 19, 2025 · Python's ValueError occurs when a function gets an unexpected value, We can equally do the same to a previous example that caused an error due to spaces in the numbers, There are no missing values in the dataset and no strings, T, I write the is dataframe to csv then want to load it through the following pd, This guide provides solutions to fix string Blank lines and line ends are not magical, rather they're represented by a 'newline' character, Passing categorical data to Sklearn Decision Tree Why One-Hot Encode Data in Aug 12, 2018 · I am reading data from csv file and then converting it into list, yzshyx ixngc uve gsk kjgok jsw ohuklr pbuvj pyskcs ccpa