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delete last blank row csv file

I have a csv file in which I want to change the written data. But when writing data, I get a blank line at the end of the file. How do I delete the last blank line?
import csv
accounts = []
account = []
sep = ";"
#get data to accounts
with open(filename, 'r') as csvfile:
csvreader = csv.reader(csvfile)
for row in csvreader:
text = [row]
uncuttext = sep.join(row)
account = uncuttext.split(sep)
accounts.append(account)
#edit data
def edit(position: str, rate: float):
for x in range(len(accounts)):
plat = float(ucty[x][5])
if accounts[x][7] == position:
plat = round(plat * rate)
accounts[x][5] = str(plat)
#save data
def save():
with open(filename, 'w', newline='') as csvfile:
csvwriter = csv.writer(csvfile, delimiter=sep, quoting=csv.QUOTE_NONE)
csvwriter.writerows(accounts)
I tried How write csv file without new line character in last line? but it didn't work.

Are you referring to something like this?
1,truck,purple
2,car,red
3,van,blue
--blank line
Try something like this where you remove the newline from the last record on read in.
with open(filename, 'r') as csvfile:
lines = csvfile.readlines()
last_line = lines[len(lines)-1]
lines[len(lines)-1] = last_line.rstrip()
for row in lines:
....
....
#save data
def save():
with open(filename, 'w', newline='', escapechar='', lineterminator='') as csvfile:
....

Python concatanate files

file 1.csv:
traider1,domain.net,tomb,Raider1
traider,domain.net,tomb,Raider
file 2.txt:
TECH-1377
TECH-1366
How to combine these 2 files into 3rd ?
so i can get 3.csv:
traider1,domain.net,tomb,Raider1,TECH-1377
traider,domain.net,tomb,Raider,TECH-1366
i tried :
import fileinput
files= ['1.csv','2.txt']
allfiles = fileinput.input(files)
for line in allfiles: # this will iterate over lines in all the files
print(line)
and got
traider1,domain.net,tomb,Raider1
traider,domain.net,tomb,Raider
TECH-1377
TECH-1366

import csv
with open('file 1.csv', 'r') as f:
data = f.readlines() #Read file1
with open('file 2.csv', 'r') as f2:
data2 = f2.readlines() #Read file2
with open('file 2.csv', 'w') as f3:
writer = csv.writer(f3, delimiter=',')
for i, line in enumerate(data):
val = "{0},{1}".format(line.strip(), data2[i].strip())
writer.writerow(val.split(","))

Python file matching and appending

This is one file result.csv:
M11251TH1230
M11543TH4292
M11435TDS144
This is another file sample.csv:
M11435TDS144,STB#1,Router#1
M11543TH4292,STB#2,Router#1
M11509TD9937,STB#3,Router#1
M11543TH4258,STB#4,Router#1
Can I write a Python program to compare both the files and if line in result.csv matches with the first word in the line in sample.csv, then append 1 else append 0 at every line in sample.csv?

import pandas as pd
d1 = pd.read_csv("1.csv",names=["Type"])
d2 = pd.read_csv("2.csv",names=["Type","Col2","Col3"])
d2["Index"] = 0
for x in d1["Type"] :
d2["Index"][d2["Type"] == x] = 1
d2.to_csv("3.csv",header=False)
Considering "1.csv" and "2.csv" are your csv input files and "3.csv" is the result you needed

The solution using csv.reader and csv.writer (csv module):
import csv
newLines = []
# change the file path to the actual one
with open('./data/result.csv', newline='\n') as csvfile:
data = csv.reader(csvfile)
items = [''.join(line) for line in data]
with open('./data/sample.csv', newline='\n') as csvfile:
data = list(csv.reader(csvfile))
for line in data:
line.append(1 if line[0] in items else 0)
newLines.append(line)
with open('./data/sample.csv', 'w', newline='\n') as csvfile:
writer = csv.writer(csvfile)
writer.writerows(newLines)
The sample.csv contents:
M11435TDS144,STB#1,Router#1,1
M11543TH4292,STB#2,Router#1,1
M11509TD9937,STB#3,Router#1,0
M11543TH4258,STB#4,Router#1,0

With only one column, I wonder why you made it as a result.csv. If it is not going to have any more columns, a simple file read operation would suffice. Along with converting the data from result.csv to dictionary will help in quick run as well.
result_file = "result.csv"
sample_file = "sample.csv"
with open(result_file) as fp:
result_data = fp.read()
result_dict = dict.fromkeys(result_data.split("\n"))
"""
You can change the above logic, in case you have very few fields on csv like this:
result_data = fp.readlines()
result_dict = {}
for result in result_data:
key, other_field = result.split(",", 1)
result_dict[key] = other_field.strip()
"""
#Since sample.csv is a real csv, using csv reader and writer
with open(sample_file, "rb") as fp:
sample_data = csv.reader(fp)
output_data = []
for data in sample_data:
output_data.append("%s,%d" % (data, data[0] in result_dict))
with open(sample_file, "wb") as fp:
data_writer = csv.writer(fp)
data_writer.writerows(output_data)

The following snippet of code will work for you
import csv
with open('result.csv', 'rb') as f:
reader = csv.reader(f)
result_list = []
for row in reader:
result_list.extend(row)
with open('sample.csv', 'rb') as f:
reader = csv.reader(f)
sample_list = []
for row in reader:
if row[0] in result_list:
sample_list.append(row + [1])
else:
sample_list.append(row + [0]
with open('sample.csv', 'wb') as f:
writer = csv.writer(f)
writer.writerows(sample_list)

Convert txt to csv python script

I have a .txt file with this inside - 2.9,Gardena CA
What I'm trying to do is convert that text into a .csv (table) using a python script:
import csv
import itertools
with open('log.txt', 'r') as in_file:
stripped = (line.strip() for line in in_file)
lines = (line for line in stripped if line)
grouped = itertools.izip(*[lines] * 3)
with open('log.csv', 'w') as out_file:
writer = csv.writer(out_file)
writer.writerow(('title', 'intro'))
writer.writerows(grouped)
The output I get in the log.csv file is - title,intro,tagline
What I would want the log.csv file to show is:
title,intro
2.9,Gardena CA

You need to split the line first.
import csv
with open('log.txt', 'r') as in_file:
stripped = (line.strip() for line in in_file)
lines = (line.split(",") for line in stripped if line)
with open('log.csv', 'w') as out_file:
writer = csv.writer(out_file)
writer.writerow(('title', 'intro'))
writer.writerows(lines)

import pandas as pd
df = pd.read_fwf('log.txt')
df.to_csv('log.csv')

This is how I do it:
with open(txtfile, 'r') as infile, open(csvfile, 'w') as outfile:
stripped = (line.strip() for line in infile)
lines = (line.split(",") for line in stripped if line)
writer = csv.writer(outfile)
writer.writerows(lines)
Hope it helps!

I suposse this is the output you need:
title,intro,tagline
2.9,Gardena,CA
It can be done with this changes to your code:
import csv
import itertools
with open('log.txt', 'r') as in_file:
lines = in_file.read().splitlines()
stripped = [line.replace(","," ").split() for line in lines]
grouped = itertools.izip(*[stripped]*1)
with open('log.csv', 'w') as out_file:
writer = csv.writer(out_file)
writer.writerow(('title', 'intro', 'tagline'))
for group in grouped:
writer.writerows(group)

In python version 3.x, the intertools.izip is not operate.
The functional code for Python 3 is:
import csv
import zlib
with open('output.txt', 'r') as in_file:
lines = in_file.read().splitlines()
stripped = [line.replace(","," ").split() for line in lines]
grouped = zip(*[stripped]*1)
with open('teste.csv', 'w') as out_file:
writer = csv.writer(out_file)
writer.writerow(('A', 'B', 'C', 'D'))
for group in grouped:
writer.writerows(group)

Writing to a file after parsing

I have written a small python code where it will read a sample csv file and copy its first column to a temp csv file. Now when I try to compare that temporary file with another text file and try to write result to another file called result file, The file is created but with empty content.
But when i tested it in chunks, It is working fine
import csv
f = open("sample.csv", "r")
reader = csv.reader(f)
data = open("temp1.csv", "w")
w = csv.writer(data)
for row in reader:
my_row = []
my_row.append(row[0])
w.writerow(my_row)
with open('temp1.csv', 'r') as file1:
with open('serialNumber.txt', 'r') as file2:
same = set(file1).intersection(file2)
with open('result.txt', 'w') as file_out:
for line in same:
file_out.write(line)
print line
sample.csv
M11435TDS144,STB#1,Router#1
M11543TH4292,STB#2,Router#1
M11509TD9937,STB#3,Router#1
M11543TH4258,STB#4,Router#1
serialNumber.txt
G1A114042400571
M11543TH4258
M11251TH1230
M11435TDS144
M11543TH4292
M11509TD9937

You should close the output file (temp1.csv) before you can read data from it.
import csv
f = open("sample.csv", "r")
reader = csv.reader(f)
data = open("temp1.csv", "w")
w = csv.writer(data)
for row in reader:
my_row = []
my_row.append(row[0])
w.writerow(my_row)
data.close() # <--- Should close it before reading it in the same program !!
with open('temp1.csv', 'r') as file1:
with open('serialNumber.txt', 'r') as file2:
same = set(file1).intersection(file2)
with open('result.txt', 'w') as file_out:
for line in same:
file_out.write(line)
print line

Points regarding code:
data file handle is not closed. data.close() after writing to temp1.csv.
In your code, same = set(file1).intersection(file2), you are directly passing file handle file2 to intersection. It expects list. This is exact problem is. It should be same = set(file1.readlines()).intersection(file2.readlines())
Working Code:
import csv
f = open("sample.csv", "r")
reader = csv.reader(f)
data = open("temp1.csv", "wb")
w = csv.writer(data)
for row in reader:
my_row = []
if len(row) != 0:
my_row.append(row[0])
w.writerow(my_row)
#File should be closed
data.close()
with open('temp1.csv', 'r') as file1:
with open('serialNumber.txt', 'r') as file2:
tmp_list = (file1.readlines())
ser_list = (file2.readlines())
same = set(file1.readlines()).intersection(file2.readlines())
with open('result.txt', 'w') as file_out:
for line in same:
file_out.write(line)
Content of temp1.csv:
M11435TDS144
M11543TH4292
M11509TD9937
M11543TH4258
Content of result.txt :
M11543TH4258
M11543TH4292
M11435TDS144
You can use with for opening files sample.csv and temp1.csv as below.
import csv
with open("sample.csv") as f:
with open("temp1.csv",'wb') as data:
reader = csv.reader(f)
w = csv.writer(data)
for row in reader:
my_row = []
my_row.append(row[0])
w.writerow(my_row)
with open('temp1.csv', 'r') as file1:
with open('serialNumber.txt', 'r') as file2:
same = set(file1.readlines()).intersection(file2.readlines())
with open('result.txt', 'w') as file_out:
for line in same:
file_out.write(line)