So i have the code :
user1 = input("What is player 1's first name?")
user2 = input("What is player 2's first name?")
import csv
with open('scores.csv', 'r+', newline='') as csvfile:
fieldnames = ['username', 'score']
writer = csv.DictWriter(csvfile, fieldnames=fieldnames)
writer.writerow({'username': user1, 'score': '1'})
writer.writerow({'username': user2, 'score': '2'})
row = next()
csvfile.close
for a school project involving reading and writing csv files with excel. The output is:
Username,score
Joe,1
Blogs,2
But when the code is ran again with different usernames it overwrites the first set of usernames.
All i need to know is how to go to the next available set of cells to input the new users
-Thank you in advance
#Eli Harold is correct that you don't need csvfile.close. When you use the with open() syntax, python automatically closes the file when the block is done (when you go back to un-indented code).
They are also correct that if you wanted to simply append to the file you should use "a+". However, you also have to keep in mind that the first time you write to the file you want to include a header and after that you don't. It would be easier if you could have all your data and write it all in one go rather than running the same code again to write more data.
However, assuming you want to go through with this write multiple times strategy, here's some code.
I did this in two ways
# It's good practice to put the import statements at the top
import csv
# This is what will allow you to check whether or not the scores.csv file exists yet
from os.path import exists
user1 = input("What is player 1's first name?")
user2 = input("What is player 2's first name?")
fieldnames = ['username', 'score']
# ------ Solution 1 -------
if exists("scores.csv"):
# You don't need `newline=''`
with open('scores.csv', 'a') as csvfile:
writer = csv.DictWriter(csvfile, fieldnames=fieldnames)
writer.writerow({'username': user1, 'score': '1'})
writer.writerow({'username': user2, 'score': '2'})
else:
# Note over here we are using 'w' because no file exists yet and
# we are writing a header.
with open('scores.csv', 'w') as csvfile:
writer = csv.DictWriter(csvfile, fieldnames=fieldnames)
writer.writeheader()
writer.writerow({'username': user1, 'score': '1'})
writer.writerow({'username': user2, 'score': '2'})
# ------ Solution 2 --------
# This solution is cleaner.
write_header = not exists("scores.csv")
with open('scores.csv', 'a') as csvfile:
writer = csv.DictWriter(csvfile, fieldnames=fieldnames)
if write_header:
writer.writeheader()
writer.writerow({'username': user1, 'score': '1'})
writer.writerow({'username': user2, 'score': '2'})
You don't need newline=''. You can check the documentation for more details but without it csv.reader will still work.
Related
I stored data on a CSV file with Python. Now I need to read it with Python but there are some issues with it. There is a
";;;;;;"
statement on the finish of every line.
Here is the code that I used for writing data to CSV :
file = open("products.csv", "a")
writer = csv.writer(file, delimiter=",", quotechar='"', quoting=csv.QUOTE_ALL)
writer.writerow(data)
And I am trying to read that with that code :
with open("products.csv", "r", newline="") as in_file, open("3.csv", "w", newline='') as to_file:
reader = csv.reader(in_file, delimiter="," ,doublequote=True)
for row in reader:
print(row)
Of course, I am not reading it for just printing I need to remove duplicated lines and make it a readable CSV.
I've tried this to fetch strings and edit them and it's worked for other fields except for semicolons. I cant understand why I cant edit those semicolons.
for row in reader:
try:
print(row)
rowList = row[0].split(",")
for index, field in enumerate(rowList):
if '"' in field:
field = field.replace('"', "")
elif ";;;;;;" in rowList[index]:
field = field.replace(";;;;;;", "")
rowList[index] = field
print(rowList)
Here is the output of the code above :
['Product Name', 'Product Description', 'SKU', 'Regular Price', 'Sale Price', 'Images;;;;;;']
Can anybody help me?
I realized that I used 'elif' on there. I changed it and it solved. Thanks for the help. But I still don't know why it added that semicolon to there.
I am programming a discord bot that lets users send an embed to a channel. The embed is split into multiple parts, which I want to safe to a CSV file because I want to add features that require the data to be saved.
The problem is, that when a user executes the command, the first line in the CSV gets overridden with the new content of the command/embed.
I tried to use a different mode to save to the next line. 'w' for writing is the one I am experiencing the problem with. The mode 'a' almost works, but it also adds the field names every time.
The CSV Code:
with open('homework.csv', 'a', newline='') as file:
fieldnames = ['user', 'fach', 'aufgabe', 'abgabedatum']
writer = csv.DictWriter(file, fieldnames=fieldnames)
writer.writeheader()
writer.writerow({'user': str(message.author), 'fach': subject, 'aufgabe': task, 'abgabedatum': date})
The CSV Output using the mode a
user,fach,aufgabe,abgabedatum
user,fach,aufgabe,abgabedatum
Akorian#0187,test,ja mddoiddn ,01.03.2021
user,fach,aufgabe,abgabedatum
Akorian#0187,testddd,ja mddoiddn ,01.03.2021
Try this:
import csv
import os
if os.path.isfile('homework.csv'):
with open('homework.csv', 'a', newline='') as file:
fieldnames = ['user', 'fach', 'aufgabe', 'abgabedatum']
w = csv.DictWriter(file, fieldnames=fieldnames)
w.writerow({'user': str(message.author), 'fach': subject, 'aufgabe': task, 'abgabedatum': date})
else:
with open('homework.csv', 'w', newline='') as file:
fieldnames = ['user', 'fach', 'aufgabe', 'abgabedatum']
w = csv.DictWriter(file, fieldnames=fieldnames)
w.writeheader()
w.writerow({'user': str(message.author), 'fach': subject, 'aufgabe': task, 'abgabedatum': date})
Looking to edit rows in my csv document and I keep getting flip-flopping issues between requiring "bytes-like object is required" and "Error: iterator should return strings, not bytes"
Running Python3
I have tried changing the mode from "rb" to "r" as well as placing generic string texts in the writer.writerow loop.
The CSV file is definitely comma separated, not tab separated.
I am following this youtube tutorial: https://www.youtube.com/watch?v=pOJ1KNTlpzE&t=75s (1:40)
temp_file = NamedTemporaryFile(delete=False)
with open('clientlist.csv','rb') as csvfile, temp_file:
reader = csv.DictReader(csvfile)
fieldnames = ['Account Name','Account Number','Date Last Checked']
writer = csv.DictWriter(temp_file, fieldnames=fieldnames)
writer.writeheader()
print(temp_file.name)
for row in reader:
writer.writerow({
'Account Name': row['Account Name'],
'Account Number': row['Account Number'],
'Date Last Checked': row['Date Last Checked'],
})
#shutil.move(temp_file.name, client_list)
Expected result should make it when I open the temp_file there is data. Then, from what I read, the shuthil should copy it. Right now the temp_file is blank.
Any ideas if it would be easier to start from scratch and use numpy or pandas? Saw this video on that: https://www.youtube.com/watch?v=pbjGo3oj0PM&list=PLulVrUACBIGX8JT7vpoHVQLYqgOKeunb6&index=16&t=0s
According to the NamedTemporaryFile documentation, named temporary files are opened in w+b mode by default - i.e. binary.
Since you are reading and writing csv files, it makes no sense (to me) to operate in binary mode, so rather open the input file in r mode, and ask for a temporary file in w mode:
import csv
import tempfile
temp_file = tempfile.NamedTemporaryFile(mode='w', delete=False) # note the mode argument
with open('clientlist.csv','r') as csvfile, temp_file: #note the mode argument
reader = csv.DictReader(csvfile)
fieldnames = ['Account Name','Account Number','Date Last Checked']
writer = csv.DictWriter(temp_file, fieldnames=fieldnames)
writer.writeheader()
for row in reader:
writer.writerow({
'Account Name': row['Account Name'],
'Account Number': row['Account Number'],
'Date Last Checked': row['Date Last Checked'],
})
That seems to behave for me.
Here they recommend defining the encoding:
Python 3.1.3 Win 7: csv writerow Error "must be bytes or buffer, not str"
Nevertheless, why don't you open the temporary file with open?
Like,
temp_file = open("new_file.csv", 'wb');
Im trying to read a csv file, and create a new cvs file, with the contents of the old cvs file with Python. My Problem is, that all entrys are saved in the first column, and i cant find a way to save the informations in different columns. Here is my code:
import csv
from itertools import zip_longest
fieldnamesOrdered = ['First Name', 'Last Name' , 'Email', 'Phone Number',
'Street Address', 'City', 'State', 'HubSpot Owner', 'Lifecyle Stage', 'Lead
Status', 'Favorite Color']
listOne = []
listTwo = []
with open('Contac.csv', 'r', encoding = 'utf-8') as inputFile,
open('result.csv', 'w', encoding = 'utf-8') as outputFile:
reader = csv.DictReader(inputFile)
writer = csv.writer(outputFile, delimiter = 't')
for row in reader:
listOne.append(row['First Name'])
listTwo.append(row['Last Name'])
dataLists = [listOne, listTwo]
export_data = zip_longest(*dataLists, fillvalue='')
writer.writerow(fieldnamesOrdered)
writer.writerows(export_data)
inputFile.close()
outputFile.close()
Thank you very much for your answers
writer = csv.writer(outputFile, delimiter = 't')
Aren't those entries in the first column additionally interspersed with strange unsolicited 't' characters?
When I run this code...
from simple_salesforce import Salesforce
sf = Salesforce(username='un', password='pw', security_token='tk')
cons = sf.query_all("SELECT Id, Name FROM Contact WHERE IsDeleted=false LIMIT 2")
import csv
with open('c:\test.csv', 'w') as csvfile:
fieldnames = ['contact_name__c', 'recordtypeid']
writer = csv.DictWriter(csvfile, fieldnames=fieldnames)
writer.writeheader()
for con in cons['records']:
writer.writerow({'contact_name__c': con['Id'], 'recordtypeid': '082I8294817IWfiIWX'})
print('done')
I get the following output inside my CSV file...
contact_name__c,recordtypeid
xyzzyID1xyzzy,082I8294817IWfiIWX
abccbID2abccb,082I8294817IWfiIWX
I'm not sure why those extra lines are there.
Any tips for getting rid of them so my CSV file will be normal-looking?
I'm on Python 3.4.3 according to sys.version_info.
Here are a few more code-and-output pairs, to show the kind of data I'm working with:
from simple_salesforce import Salesforce
sf = Salesforce(username='un', password='pw', security_token='tk')
print(sf.query_all("SELECT Id, Name FROM Contact WHERE IsDeleted=false LIMIT 2"))
produces
OrderedDict([('totalSize', 2), ('done', True), ('records', [OrderedDict([('attributes', OrderedDict([('type', 'Contact'), ('url', '/services/data/v29.0/sobjects/Contact/xyzzyID1xyzzy')])), ('Id', 'xyzzyID1xyzzy'), ('Name', 'Person One')]), OrderedDict([('attributes', OrderedDict([('type', 'Contact'), ('url', '/services/data/v29.0/sobjects/Contact/abccbID2abccb')])), ('Id', 'abccbID2abccb'), ('Name', 'Person Two')])])])
and
from simple_salesforce import Salesforce
sf = Salesforce(username='un', password='pw', security_token='tk')
cons = sf.query_all("SELECT Id, Name FROM Contact WHERE IsDeleted=false LIMIT 2")
for con in cons['records']:
print(con['Id'])
produces
xyzzyID1xyzzy
abccbID2abccb
Two likely possibilities: the output file needs to be opened in binary mode and/or the writer needs to be told not to use DOS style line endings.
To open the file in binary mode in Python 3 replace your current with open line with:
with open('c:\test.csv', 'w', newline='') as csvfile:
to eliminate the DOS style line endings try:
writer = csv.DictWriter(csvfile, fieldnames=fieldnames, lineterminator="\n")