Guys, I here have 200 separate csv files named from SH (1) to SH (200). I want to merge them into a single csv file. How can I do it?
This question is related to
python
csv
merge
concatenation
Here is a script:
SH1.csv
to SH200.csv
import glob
import re
# Looking for filenames like 'SH1.csv' ... 'SH200.csv'
pattern = re.compile("^SH([1-9]|[1-9][0-9]|1[0-9][0-9]|200).csv$")
file_parts = [name for name in glob.glob('*.csv') if pattern.match(name)]
with open("file_merged.csv","wb") as file_merged:
for (i, name) in enumerate(file_parts):
with open(name, "rb") as file_part:
if i != 0:
next(file_part) # skip headers if not first file
file_merged.write(file_part.read())
If you are working on linux/mac you can do this.
from subprocess import call
script="cat *.csv>merge.csv"
call(script,shell=True)
Updating wisty's answer for python3
fout=open("out.csv","a")
# first file:
for line in open("sh1.csv"):
fout.write(line)
# now the rest:
for num in range(2,201):
f = open("sh"+str(num)+".csv")
next(f) # skip the header
for line in f:
fout.write(line)
f.close() # not really needed
fout.close()
Why can't you just sed 1d sh*.csv > merged.csv
?
Sometimes you don't even have to use python!
If the files aren't numbered in order, take the hassle-free approach below: Python 3.6 on windows machine:
import pandas as pd
from glob import glob
interesting_files = glob("C:/temp/*.csv") # it grabs all the csv files from the directory you mention here
df_list = []
for filename in sorted(interesting_files):
df_list.append(pd.read_csv(filename))
full_df = pd.concat(df_list)
# save the final file in same/different directory:
full_df.to_csv("C:/temp/merged_pandas.csv", index=False)
An easy-to-use function:
def csv_merge(destination_path, *source_paths):
'''
Merges all csv files on source_paths to destination_path.
:param destination_path: Path of a single csv file, doesn't need to exist
:param source_paths: Paths of csv files to be merged into, needs to exist
:return: None
'''
with open(destination_path,"a") as dest_file:
with open(source_paths[0]) as src_file:
for src_line in src_file.read():
dest_file.write(src_line)
source_paths.pop(0)
for i in range(len(source_paths)):
with open(source_paths[i]) as src_file:
src_file.next()
for src_line in src_file:
dest_file.write(src_line)
Over the solution that made @Adders and later on improved by @varun, I implemented some little improvement too leave the whole merged CSV with only the main header:
from glob import glob
filename = 'main.csv'
with open(filename, 'a') as singleFile:
first_csv = True
for csv in glob('*.csv'):
if csv == filename:
pass
else:
header = True
for line in open(csv, 'r'):
if first_csv and header:
singleFile.write(line)
first_csv = False
header = False
elif header:
header = False
else:
singleFile.write(line)
singleFile.close()
Best regards!!!
You can simply use the in-built csv
library. This solution will work even if some of your CSV files have slightly different column names or headers, unlike the other top-voted answers.
import csv
import glob
filenames = [i for i in glob.glob("SH*.csv")]
header_keys = []
merged_rows = []
for filename in filenames:
with open(filename) as f:
reader = csv.DictReader(f)
merged_rows.extend(list(reader))
header_keys.extend([key for key in reader.fieldnames if key not in header_keys])
with open("combined.csv", "w") as f:
w = csv.DictWriter(f, fieldnames=header_keys)
w.writeheader()
w.writerows(merged_rows)
The merged file will contain all possible columns (header_keys
) that can be found in the files. Any absent columns in a file would be rendered as blank / empty (but preserving rest of the file's data).
Note:
csv
library, but instead of using DictReader
& DictWriter
, you'll have to work with the basic reader
& writer
.merged_rows
list).I modified what @wisty said to be worked with python 3.x, for those of you that have encoding problem, also I use os module to avoid of hard coding
import os
def merge_all():
dir = os.chdir('C:\python\data\\')
fout = open("merged_files.csv", "ab")
# first file:
for line in open("file_1.csv",'rb'):
fout.write(line)
# now the rest:
list = os.listdir(dir)
number_files = len(list)
for num in range(2, number_files):
f = open("file_" + str(num) + ".csv", 'rb')
f.__next__() # skip the header
for line in f:
fout.write(line)
f.close() # not really needed
fout.close()
Use accepted StackOverflow answer to create a list of csv files that you want to append and then run this code:
import pandas as pd
combined_csv = pd.concat( [ pd.read_csv(f) for f in filenames ] )
And if you want to export it to a single csv file, use this:
combined_csv.to_csv( "combined_csv.csv", index=False )
You could import csv then loop through all the CSV files reading them into a list. Then write the list back out to disk.
import csv
rows = []
for f in (file1, file2, ...):
reader = csv.reader(open("f", "rb"))
for row in reader:
rows.append(row)
writer = csv.writer(open("some.csv", "wb"))
writer.writerows("\n".join(rows))
The above is not very robust as it has no error handling nor does it close any open files. This should work whether or not the the individual files have one or more rows of CSV data in them. Also I did not run this code, but it should give you an idea of what to do.
OR, you could just do
cat sh*.csv > merged.csv
I'm just gonna through another code example in the basket
from glob import glob
with open('singleDataFile.csv', 'a') as singleFile:
for csvFile in glob('*.csv'):
for line in open(csvFile, 'r'):
singleFile.write(line)
Quite easy to combine all files in a directory and merge them
import glob
import csv
# Open result file
with open('output.txt','wb') as fout:
wout = csv.writer(fout,delimiter=',')
interesting_files = glob.glob("*.csv")
h = True
for filename in interesting_files:
print 'Processing',filename
# Open and process file
with open(filename,'rb') as fin:
if h:
h = False
else:
fin.next()#skip header
for line in csv.reader(fin,delimiter=','):
wout.writerow(line)
A slight change to the code above as it does not actually work correctly.
It should be as follows...
from glob import glob
with open('main.csv', 'a') as singleFile:
for csv in glob('*.csv'):
if csv == 'main.csv':
pass
else:
for line in open(csv, 'r'):
singleFile.write(line)
Let's say you have 2 csv
files like these:
csv1.csv:
id,name
1,Armin
2,Sven
csv2.csv:
id,place,year
1,Reykjavik,2017
2,Amsterdam,2018
3,Berlin,2019
and you want the result to be like this csv3.csv:
id,name,place,year
1,Armin,Reykjavik,2017
2,Sven,Amsterdam,2018
3,,Berlin,2019
Then you can use the following snippet to do that:
import csv
import pandas as pd
# the file names
f1 = "csv1.csv"
f2 = "csv2.csv"
out_f = "csv3.csv"
# read the files
df1 = pd.read_csv(f1)
df2 = pd.read_csv(f2)
# get the keys
keys1 = list(df1)
keys2 = list(df2)
# merge both files
for idx, row in df2.iterrows():
data = df1[df1['id'] == row['id']]
# if row with such id does not exist, add the whole row
if data.empty:
next_idx = len(df1)
for key in keys2:
df1.at[next_idx, key] = df2.at[idx, key]
# if row with such id exists, add only the missing keys with their values
else:
i = int(data.index[0])
for key in keys2:
if key not in keys1:
df1.at[i, key] = df2.at[idx, key]
# save the merged files
df1.to_csv(out_f, index=False, encoding='utf-8', quotechar="", quoting=csv.QUOTE_NONE)
With the help of a loop you can achieve the same result for multiple files as it is in your case (200 csv files).
It depends what you mean by "merging" -- do they have the same columns? Do they have headers? For example, if they all have the same columns, and no headers, simple concatenation is sufficient (open the destination file for writing, loop over the sources opening each for reading, use shutil.copyfileobj from the open-for-reading source into the open-for-writing destination, close the source, keep looping -- use the with
statement to do the closing on your behalf). If they have the same columns, but also headers, you'll need a readline
on each source file except the first, after you open it for reading before you copy it into the destination, to skip the headers line.
If the CSV files don't all have the same columns then you need to define in what sense you're "merging" them (like a SQL JOIN? or "horizontally" if they all have the same number of lines? etc, etc) -- it's hard for us to guess what you mean in that case.
fout=open("out.csv","a")
for num in range(1,201):
for line in open("sh"+str(num)+".csv"):
fout.write(line)
fout.close()
If the merged CSV is going to be used in Python then just use glob
to get a list of the files to pass to fileinput.input()
via the files
argument, then use the csv
module to read it all in one go.
import pandas as pd
import os
df = pd.read_csv("e:\\data science\\kaggle assign\\monthly sales\\Pandas-Data-Science-Tasks-master\\SalesAnalysis\\Sales_Data\\Sales_April_2019.csv")
files = [file for file in os.listdir("e:\\data science\\kaggle assign\\monthly sales\\Pandas-Data-Science-Tasks-master\\SalesAnalysis\\Sales_Data")
for file in files:
print(file)
all_data = pd.DataFrame()
for file in files:
df=pd.read_csv("e:\\data science\\kaggle assign\\monthly sales\\Pandas-Data-Science-Tasks-master\\SalesAnalysis\\Sales_Data\\"+file)
all_data = pd.concat([all_data,df])
all_data.head()
Source: Stackoverflow.com