CODEWITHSUNDEEP
pythonpandascsvfor-loop
DeepNet
DeepNet

Reputation: 161

DataFrame to CSV in a for loop with different file names

I am creating pandas DataFrames in a for loop and I would like to save them in csv files with different names at each iteration of the for loop.

I know how to save one DataFrame:

path = r"C:\Users\SessionName\FolderName\FileName.csv"
df.to_csv(path)

Now when I have a list of strings, e.g.

countries = ['United States', 'China', 'Russia', 'India']

I would like the four files to be named United States_ranking.csv, China_ranking.csv, etc.

I have tried:

for country in countries:
    path = r"C:\Users\SessionName\FolderName\" + country + "_ranking.csv"

But is won't work.

Upvotes: 0

Views: 3234

Answers (5)

Umar.H
Umar.H

Reputation: 23099

personally, I would use pathlib to handle your paths. also be careful for typos in your code.

for example,

import pandas as pd
from pathlib import Path

src_path  = r"C:\Users\SessionName\FolderName\FileName.csv"
countries = ['United States', 'China', 'Russia', 'India']

for country in countries:
    p = Path(src_path).parent.joinpath(f"{country}_ranking.csv")
    df.to_csv(p,index=False)

this will write:

C:\Users\SessionName\FolderName\United States_ranking.csv
C:\Users\SessionName\FolderName\China_ranking.csv
C:\Users\SessionName\FolderName\Russia_ranking.csv
C:\Users\SessionName\FolderName\India_ranking.csv

The benefit of having a pathlib object here is that you can check if the directory is valid or if the file exists before hand.

print(p)
WindowsPath('C:/Users/SessionName/FolderName/United States_ranking.csv')
if not p.is_file():
   df.to_csv(p,index=False)
else:
    print('file exists')

Upvotes: 2

Salamander Krajza
Salamander Krajza

Reputation: 236

Looks like rawstring dont work with "\" and the end of the string.

You can fix it by adding extra \ after your path to folder by puting double "\\" in another string.

countries = ['United States', 'China', 'Russia', 'India']
for country in countries:
    path = r"C:\Users\SessionName\FolderName" + "\\" + country + "_ranking.csv"

Upvotes: 0

Dejene T.
Dejene T.

Reputation: 989

use this:

for country in countries:
    path = r"C:\\Users\\SessionName\\FolderName\\ {} _ranking.csv".format(country)

Upvotes: 2

辜乘风
辜乘风

Reputation: 152

I prefer os.path.join(folder, country+filename)

for country in countries:
    path = os.path.join("C:\\Users\\SessionName\\FolderName\\", country + "_ranking.csv")
    df.loc[df.country == country].to_csv(path)

Upvotes: 0

lauriane.g
lauriane.g

Reputation: 337

You have to write the path like this, otherwise it causes a problem with "\"

for country in countries:
    path = r"C:\\Users\\SessionName\\FolderName\\" + country + "_ranking.csv"

Upvotes: 0

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