Splitting CSV Files in Python
In this article, see a code snippet that splits CSV files in Python.
By
·
·
Code Snippet
Likes
(5)
Likes
There are no likes...yet! 👀
Be the first to like this post!
It looks like you're not logged in.
Sign in to see who liked this post!
Comment
Save
71.4K Views
Join the DZone community and get the full member experience.
Join For FreeSometimes it is necessary to split big files into small ones. In this brief article, I will share a small script which is written in Python. Maybe you can develop it further. However, if the file size is bigger you should be careful using loops in your code.
Let's assume your input file name input.csv. The code will split it into new files with names input_1.csv, ..., input_10.csv.,...
Python
x
1
import pandas as pd
2
3
#csv file name to be read in
4
in_csv = 'input.csv'
5
6
#get the number of lines of the csv file to be read
7
number_lines = sum(1 for row in (open(in_csv)))
8
9
#size of rows of data to write to the csv,
10
#you can change the row size according to your need
11
rowsize = 500
12
13
#start looping through data writing it to a new file for each set
14
for i in range(1,number_lines,rowsize):
15
df = pd.read_csv(in_csv,
16
header=None,
17
nrows = rowsize,#number of rows to read at each loop
18
skiprows = i)#skip rows that have been read
19
20
#csv to write data to a new file with indexed name. input_1.csv etc.
21
out_csv = 'input' + str(i) + '.csv'
22
23
df.to_csv(out_csv,
24
index=False,
25
header=False,
26
mode='a',#append data to csv file
27
chunksize=rowsize)#size of data to append for each loop
Python (language)
CSV
Opinions expressed by DZone contributors are their own.
Comments