Pandas loop through files in directory. last concate them to one big

Pandas loop through files in directory. last concate them to one big df:. parent. import pandas as pd import os path = "path of the file" files = [file for file in os. read_excel(excel, sheet_name=None) # iterate over the dict keys (which is the sheet I used this in my project for merging the csv files. py"): # print(os. listdir() This method utilizes the os module to list all files in the specified directory, then filters for CSV files based on their Aug 13, 2022 · For me your code worked because I executed the code from the same folder where the xlsx files are placed, but if you are running it from, lets say, a directory folder, and you have the xlsx files in folder/files/, python will try to read files and get a list of names like file. csv in a specified directory. /files/file. This blog post will explore the different Mar 24, 2021 · Now that we have the files, we can loop through each one to read the contents and create a DataFrame variable. xlsx') # iterate through the excel file names for excel in excel_names: # read the excel file with sheet_name as none # this will create a dict dfs = pd. com Mar 24, 2025 · When working with file systems in Python, there are often scenarios where you need to perform operations on multiple files within a directory. Print out the first 10 lines of the final combined DataFrame. import os directory = os. glob('*. asm") or filename. concat([pd. read_csv(file) Now I want to take the date_name from the file name and add a column called date. os. Loop Through the Files: After finding the files, we'll loop through each file, read it into a DataFrame, and append it to a list of DataFrames. See full list on dustinkmacdonald. scandir() pathlib module; os. import pandas as pd from pathlib import Path root_dir = Path('/top_level_dir/') files = {file. columns) print(len(my_list),my_list) Apr 5, 2025 · Use glob() to Find CSV Files: The glob module helps us retrieve all CSV files matching the pattern *. Save them to a list called dfs , and then use pd. import pandas as pd import glob path = r"C:\Users\gumnwe\OneDrive - BP\Desktop\Personal\eiLink\Skin Project\Skin_Project_Data_2020\*. join' to ensure the correct path is used. Path(). path. iterdir(), we can efficiently iterate over all files in a directory. read_csv(fp) for fp in files], ignore_index=True) Nov 5, 2016 · I was trying to loop through the folder containing cvs files and print the number and the name of the columns. Aug 10, 2021 · The module is useful to change the current working directory, iterate over files, get the working directories, etc. read_csv(file). xlsx, but you will need this: . fsencode(directory_in_str) for file in os. Apr 30, 2012 · Python 3. EDIT. Here is how we can do that: Feb 20, 2024 · 💡 Problem Formulation: When working with file systems in Python, it’s common to need to iterate over all the files in a directory and its subdirectories. Following code worked for me. scandir() method . glob("*. glob(path): df=pd. I know that I can check how many csv files there are in a given folder (check here): import glob for files in glob. Using os. Every file is exactly the same but I want to track changes over time and the only date is found just on the name of the file. listdir(path) if not file. Method 2: Using os. read_csv(fname) my_list=list(df. Using Path(directory). csv" for fname in glob. sheet_names # Load the xlsx files Data sheet as a dataframe df = xlsx_file. pathlib module offers an object-oriented approach to handling file paths. Looping through files in a directory is a fundamental task that allows you to automate processes such as reading data from multiple files, modifying file contents, or organizing files based on certain criteria. listdir(directory): filename = os. read_csv(path+"/"+file , encoding = "ISO-8859-1") all_data = pd. join(directory, filename)) continue else: continue Sep 19, 2024 · Iterate Over Files Using os. glob('files/*. parse('Data',header= None) # select important rows, df_NoHeader = df[4:] #then It Sep 9, 2020 · Let's try pathlib with rglob which will recursively search your directory structure for all files that match a glob pattern. listdir() in Python to loop through files Sep 7, 2017 · You can try another solution with glob for return file names, then loop in list comprehension and create list of DataFrames. This could be for tasks such as searching for a specific file, summarizing content, or batch processing. csv"): print files But I failed to figure out how to possibly nest the numpy. Apr 1, 2015 · for file in filelist: df = pd. parts[-1] : file for file in Path. ')] all_data = pd. concat([all_data,current_data]) Feb 24, 2025 · Using pathlib. scandir() function to iterate through files in the specified directory. rglob('*survey. endswith(". genfromtxt() function in a for loop, so that I read in all the csv files of a directory that it is up to me to specify. xlsx to be able to locate May 24, 2016 · # create for loop for File in FileList: for x in File: # Import the excel file and call it xlsx_file xlsx_file = pd. ExcelFile(File) xlsx_file # View the excel files sheet names xlsx_file. The folder I have Find all of the CSV files in the data folder that contain GDP data. csv')} df = pd. It has a function to interact with an operating system. walk() glob module; 1. import glob files = glob. startswith('. . Note that not all the Gapminder data files contain GDP data, but the file names will indicate which ones do. A Dictionary allows us to create a key-value pair for each file where the value is the DataFrame. assign(customer=name) for name,file in files. Mar 4, 2024 · Then, it reads each CSV file into a pandas DataFrame and concatenates them into a single DataFrame df, with the ignore_index=True parameter ensuring that the index is properly constructed. Read these files in using a for loop. Dynamically assigning variables using a For Loop can be done with the help of a Dictionary. For each file encountered, it opens and prints both the file name and its content to the console, employing 'os. DataFrame() for file in files: current_data = pd. Mar 11, 2021 · import pandas as pd import glob # get the file names using glob # (this assumes that the files are in the current working directory) excel_names = glob. Concatenate the data files into a single pandas DataFrame. 6 version of the above answer, using os - assuming that you have the directory path as a str object in a variable called directory_in_str:. in this instance survey. concat() to concatenate all of the DataFrames from the dfs list together into a new DataFrame called, new_df . iterdir(). Then I will append it. csv') df = pd. items()]) Apr 10, 2025 · Use glob and a for loop to iterate through all of the CSV files in the folder that have a file name that begins with data. In this example, the Python script utilizes the 'os' module and os. fsdecode(file) if filename. 5 Ways in Python to loop through files in a directory. listdir() os. jojbdy ehofbgjy twzuo nwxhbs hncsmf qibwgel pkgcjocq wvcrq wntwi ndxrfjm