我正在处理许多csv文件,需要添加列。我尝试了glob,例如:
import glob
filenames = sorted(glob.glob('./DATA1/*2018*.csv'))
filenames = filenames[0:10]
import numpy as np
import pandas as pd
for f in filenames:
df = pd.read_csv(f, header=None, index_col=None)
df.columns = ['Date','Signal','Data','Code']
#this is what I should add to all csv files
df["ID"] = df["Data"].str.slice(0,2)
,在将列添加到每个csv文件后,我需要一种方法将文件以其他名称(例如“ file01edited.csv”)保存回csv(未连接)。
答案 0 :(得分:1)
将to_csv
与f-string
一起用于更改文件名:
for f in filenames:
df = pd.read_csv(f, names=['Date','Signal','Data','Code'], index_col=None)
#this is what I should add to all csv files
df["ID"] = df["Data"].str.slice(0,2)
#python 3.6+
df.to_csv(f'{f[:-4]}edited.csv', index=False)
#python bellow 3.6
#df.to_csv('{}edited.csv'.format(f[:-4]), index=False)