Using Dict reader, how do I insert into CSV file?
0
I'm supposed to load a CSV file into the program memory, and when the user chooses option 1, they are allowed to add in a student's details. Upon pressing 'ENTER', the program will then write the user input into the csv file. I sort of got it to work, but if the user decides to add another user, it overides the first student details that's already in the CSV.
What I have so far is:
def insert_student():
print()
print("Insert a new student:")
first_name = input("Enter first name:")
last_name = input("Enter last name:")
student_id = input("Enter student ID:")
student_info = "first_name":first_name,"last_name":last_name,"student_id":student_id
import csv
filePath = "data.csv"
with open(filePath, 'w', newline='') as csvfile:
fieldnames = ['first_name', 'last_name', 'student_id']
writer = csv.DictWriter(csvfile, fieldnames=fieldnames)
writer.writeheader()
writer.writerow('first_name': first_name,
'last_name': last_name,
'student_id': student_id)
print("New Student Record Inserted")
How do I make it such that when the user decides to add multiple student details, it doesn't override it, and adds it to a new row?
python
asked Nov 13 '18 at 14:12
AzaqiAzaqi
518
add a comment |
0
I'm supposed to load a CSV file into the program memory, and when the user chooses option 1, they are allowed to add in a student's details. Upon pressing 'ENTER', the program will then write the user input into the csv file. I sort of got it to work, but if the user decides to add another user, it overides the first student details that's already in the CSV.
What I have so far is:
def insert_student():
print()
print("Insert a new student:")
first_name = input("Enter first name:")
last_name = input("Enter last name:")
student_id = input("Enter student ID:")
student_info = "first_name":first_name,"last_name":last_name,"student_id":student_id
import csv
filePath = "data.csv"
with open(filePath, 'w', newline='') as csvfile:
fieldnames = ['first_name', 'last_name', 'student_id']
writer = csv.DictWriter(csvfile, fieldnames=fieldnames)
writer.writeheader()
writer.writerow('first_name': first_name,
'last_name': last_name,
'student_id': student_id)
print("New Student Record Inserted")
How do I make it such that when the user decides to add multiple student details, it doesn't override it, and adds it to a new row?
python
asked Nov 13 '18 at 14:12
AzaqiAzaqi
518
You need to open your file in append mode if you want to modify it more than once.
– toti08
Nov 13 '18 at 14:17
add a comment |
0
0
0
I'm supposed to load a CSV file into the program memory, and when the user chooses option 1, they are allowed to add in a student's details. Upon pressing 'ENTER', the program will then write the user input into the csv file. I sort of got it to work, but if the user decides to add another user, it overides the first student details that's already in the CSV.
What I have so far is:
def insert_student():
print()
print("Insert a new student:")
first_name = input("Enter first name:")
last_name = input("Enter last name:")
student_id = input("Enter student ID:")
student_info = "first_name":first_name,"last_name":last_name,"student_id":student_id
import csv
filePath = "data.csv"
with open(filePath, 'w', newline='') as csvfile:
fieldnames = ['first_name', 'last_name', 'student_id']
writer = csv.DictWriter(csvfile, fieldnames=fieldnames)
writer.writeheader()
writer.writerow('first_name': first_name,
'last_name': last_name,
'student_id': student_id)
print("New Student Record Inserted")
How do I make it such that when the user decides to add multiple student details, it doesn't override it, and adds it to a new row?
python
asked Nov 13 '18 at 14:12
AzaqiAzaqi
518
I'm supposed to load a CSV file into the program memory, and when the user chooses option 1, they are allowed to add in a student's details. Upon pressing 'ENTER', the program will then write the user input into the csv file. I sort of got it to work, but if the user decides to add another user, it overides the first student details that's already in the CSV.
What I have so far is:
def insert_student():
print()
print("Insert a new student:")
first_name = input("Enter first name:")
last_name = input("Enter last name:")
student_id = input("Enter student ID:")
student_info = "first_name":first_name,"last_name":last_name,"student_id":student_id
import csv
filePath = "data.csv"
with open(filePath, 'w', newline='') as csvfile:
fieldnames = ['first_name', 'last_name', 'student_id']
writer = csv.DictWriter(csvfile, fieldnames=fieldnames)
writer.writeheader()
writer.writerow('first_name': first_name,
'last_name': last_name,
'student_id': student_id)
print("New Student Record Inserted")
How do I make it such that when the user decides to add multiple student details, it doesn't override it, and adds it to a new row?
python
python
asked Nov 13 '18 at 14:12
AzaqiAzaqi
518
asked Nov 13 '18 at 14:12
AzaqiAzaqi
518
asked Nov 13 '18 at 14:12
AzaqiAzaqi
518
asked Nov 13 '18 at 14:12
AzaqiAzaqi
518
asked Nov 13 '18 at 14:12
AzaqiAzaqi
518
518
You need to open your file in append mode if you want to modify it more than once.
– toti08
Nov 13 '18 at 14:17
add a comment |
You need to open your file in append mode if you want to modify it more than once.
– toti08
Nov 13 '18 at 14:17
You need to open your file in append mode if you want to modify it more than once.
– toti08
Nov 13 '18 at 14:17
You need to open your file in append mode if you want to modify it more than once.
– toti08
Nov 13 '18 at 14:17
add a comment |
2 Answers
2
active
oldest
votes
0
you have to open file with 'a' mode and write header only when it's new csv file,
try this:
import os
import csv
def insert_student():
print()
print("Insert a new student:")
first_name = input("Enter first name:")
last_name = input("Enter last name:")
student_id = input("Enter student ID:")
student_info = "first_name": first_name, "last_name": last_name, "student_id": student_id
filePath = "data.csv"
edit_mode = os.path.isfile(filePath)
with open(filePath, 'a', newline='') as csvfile:
fieldnames = ['first_name', 'last_name', 'student_id']
writer = csv.DictWriter(csvfile, fieldnames=fieldnames)
if not edit_mode:
writer.writeheader()
writer.writerow('first_name': first_name,
'last_name': last_name,
'student_id': student_id)
print("New Student Record Inserted")
answered Nov 13 '18 at 14:27
Sagi GolanSagi Golan
413
It sort of works! But it didn't write the header. Any idea how to make it such that on the first entry, it writes the header, and on the subsequent entries, it doesn't? I tried checking if file size is = 0, and it doesn't work, because even when the file is empty, it's 1KB.
– Azaqi
Nov 13 '18 at 15:09
add a comment |
0
Open the file in 'a' mode:
filePath = "data.csv"
with open(filePath, 'a', newline='') as csvfile:
fieldnames = ['first_name', 'last_name', 'student_id']
writer = csv.DictWriter(csvfile, fieldnames=fieldnames)
writer.writerow('first_name': first_name,
'last_name': last_name,
'student_id': student_id)
print("New Student Record Inserted")
answered Nov 13 '18 at 14:19
Imre_GImre_G
912720
It sort of works, but it keeps writing the header everytime there is a new entry. Any workaround?
– Azaqi
Nov 13 '18 at 14:24
Yeah take the fieldnames out of the loop. See edited answer. What you could do is write a small function to initiate the file and only write the headers when starting the script. There isn't really a better way, as in, all other ways are way more complicated.
– Imre_G
Nov 13 '18 at 14:29
Sorry if I keep asking, but I didn't want to completely remove the header haha. What I meant was, for the first entry, it prints out the header, and subsequent entries, it just fills in without the header.
– Azaqi
Nov 13 '18 at 14:41
You roughly have three options. 1) Open the file before you write to see if there are headers there. Then write headers if they are not there yet. This is terrible for performance, but hey, it works. 2) Write a file init function which you call once when the script starts. A bit hacky, but depending on your level of seriousness might be the easiest option. 3) Define an object and make the insert_student method a method of that object. Then you can keep a variable "headers_added" or something similar in object state. If you are serious, this is the best option. Your call.
– Imre_G
Nov 13 '18 at 18:00
add a comment |
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2 Answers
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2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
0
you have to open file with 'a' mode and write header only when it's new csv file,
try this:
import os
import csv
def insert_student():
print()
print("Insert a new student:")
first_name = input("Enter first name:")
last_name = input("Enter last name:")
student_id = input("Enter student ID:")
student_info = "first_name": first_name, "last_name": last_name, "student_id": student_id
filePath = "data.csv"
edit_mode = os.path.isfile(filePath)
with open(filePath, 'a', newline='') as csvfile:
fieldnames = ['first_name', 'last_name', 'student_id']
writer = csv.DictWriter(csvfile, fieldnames=fieldnames)
if not edit_mode:
writer.writeheader()
writer.writerow('first_name': first_name,
'last_name': last_name,
'student_id': student_id)
print("New Student Record Inserted")
answered Nov 13 '18 at 14:27
Sagi GolanSagi Golan
413
It sort of works! But it didn't write the header. Any idea how to make it such that on the first entry, it writes the header, and on the subsequent entries, it doesn't? I tried checking if file size is = 0, and it doesn't work, because even when the file is empty, it's 1KB.
– Azaqi
Nov 13 '18 at 15:09
add a comment |
0
you have to open file with 'a' mode and write header only when it's new csv file,
try this:
import os
import csv
def insert_student():
print()
print("Insert a new student:")
first_name = input("Enter first name:")
last_name = input("Enter last name:")
student_id = input("Enter student ID:")
student_info = "first_name": first_name, "last_name": last_name, "student_id": student_id
filePath = "data.csv"
edit_mode = os.path.isfile(filePath)
with open(filePath, 'a', newline='') as csvfile:
fieldnames = ['first_name', 'last_name', 'student_id']
writer = csv.DictWriter(csvfile, fieldnames=fieldnames)
if not edit_mode:
writer.writeheader()
writer.writerow('first_name': first_name,
'last_name': last_name,
'student_id': student_id)
print("New Student Record Inserted")
answered Nov 13 '18 at 14:27
Sagi GolanSagi Golan
413
It sort of works! But it didn't write the header. Any idea how to make it such that on the first entry, it writes the header, and on the subsequent entries, it doesn't? I tried checking if file size is = 0, and it doesn't work, because even when the file is empty, it's 1KB.
– Azaqi
Nov 13 '18 at 15:09
add a comment |
0
0
0
you have to open file with 'a' mode and write header only when it's new csv file,
try this:
import os
import csv
def insert_student():
print()
print("Insert a new student:")
first_name = input("Enter first name:")
last_name = input("Enter last name:")
student_id = input("Enter student ID:")
student_info = "first_name": first_name, "last_name": last_name, "student_id": student_id
filePath = "data.csv"
edit_mode = os.path.isfile(filePath)
with open(filePath, 'a', newline='') as csvfile:
fieldnames = ['first_name', 'last_name', 'student_id']
writer = csv.DictWriter(csvfile, fieldnames=fieldnames)
if not edit_mode:
writer.writeheader()
writer.writerow('first_name': first_name,
'last_name': last_name,
'student_id': student_id)
print("New Student Record Inserted")
answered Nov 13 '18 at 14:27
Sagi GolanSagi Golan
413
you have to open file with 'a' mode and write header only when it's new csv file,
try this:
import os
import csv
def insert_student():
print()
print("Insert a new student:")
first_name = input("Enter first name:")
last_name = input("Enter last name:")
student_id = input("Enter student ID:")
student_info = "first_name": first_name, "last_name": last_name, "student_id": student_id
filePath = "data.csv"
edit_mode = os.path.isfile(filePath)
with open(filePath, 'a', newline='') as csvfile:
fieldnames = ['first_name', 'last_name', 'student_id']
writer = csv.DictWriter(csvfile, fieldnames=fieldnames)
if not edit_mode:
writer.writeheader()
writer.writerow('first_name': first_name,
'last_name': last_name,
'student_id': student_id)
print("New Student Record Inserted")
answered Nov 13 '18 at 14:27
Sagi GolanSagi Golan
413
answered Nov 13 '18 at 14:27
Sagi GolanSagi Golan
413
answered Nov 13 '18 at 14:27
Sagi GolanSagi Golan
413
answered Nov 13 '18 at 14:27
Sagi GolanSagi Golan
413
413
It sort of works! But it didn't write the header. Any idea how to make it such that on the first entry, it writes the header, and on the subsequent entries, it doesn't? I tried checking if file size is = 0, and it doesn't work, because even when the file is empty, it's 1KB.
– Azaqi
Nov 13 '18 at 15:09
add a comment |
It sort of works! But it didn't write the header. Any idea how to make it such that on the first entry, it writes the header, and on the subsequent entries, it doesn't? I tried checking if file size is = 0, and it doesn't work, because even when the file is empty, it's 1KB.
– Azaqi
Nov 13 '18 at 15:09
It sort of works! But it didn't write the header. Any idea how to make it such that on the first entry, it writes the header, and on the subsequent entries, it doesn't? I tried checking if file size is = 0, and it doesn't work, because even when the file is empty, it's 1KB.
– Azaqi
Nov 13 '18 at 15:09
It sort of works! But it didn't write the header. Any idea how to make it such that on the first entry, it writes the header, and on the subsequent entries, it doesn't? I tried checking if file size is = 0, and it doesn't work, because even when the file is empty, it's 1KB.
– Azaqi
Nov 13 '18 at 15:09
add a comment |
0
Open the file in 'a' mode:
filePath = "data.csv"
with open(filePath, 'a', newline='') as csvfile:
fieldnames = ['first_name', 'last_name', 'student_id']
writer = csv.DictWriter(csvfile, fieldnames=fieldnames)
writer.writerow('first_name': first_name,
'last_name': last_name,
'student_id': student_id)
print("New Student Record Inserted")
answered Nov 13 '18 at 14:19
Imre_GImre_G
912720
It sort of works, but it keeps writing the header everytime there is a new entry. Any workaround?
– Azaqi
Nov 13 '18 at 14:24
Yeah take the fieldnames out of the loop. See edited answer. What you could do is write a small function to initiate the file and only write the headers when starting the script. There isn't really a better way, as in, all other ways are way more complicated.
– Imre_G
Nov 13 '18 at 14:29
Sorry if I keep asking, but I didn't want to completely remove the header haha. What I meant was, for the first entry, it prints out the header, and subsequent entries, it just fills in without the header.
– Azaqi
Nov 13 '18 at 14:41
You roughly have three options. 1) Open the file before you write to see if there are headers there. Then write headers if they are not there yet. This is terrible for performance, but hey, it works. 2) Write a file init function which you call once when the script starts. A bit hacky, but depending on your level of seriousness might be the easiest option. 3) Define an object and make the insert_student method a method of that object. Then you can keep a variable "headers_added" or something similar in object state. If you are serious, this is the best option. Your call.
– Imre_G
Nov 13 '18 at 18:00
add a comment |
0
Open the file in 'a' mode:
filePath = "data.csv"
with open(filePath, 'a', newline='') as csvfile:
fieldnames = ['first_name', 'last_name', 'student_id']
writer = csv.DictWriter(csvfile, fieldnames=fieldnames)
writer.writerow('first_name': first_name,
'last_name': last_name,
'student_id': student_id)
print("New Student Record Inserted")
answered Nov 13 '18 at 14:19
Imre_GImre_G
912720
It sort of works, but it keeps writing the header everytime there is a new entry. Any workaround?
– Azaqi
Nov 13 '18 at 14:24
Yeah take the fieldnames out of the loop. See edited answer. What you could do is write a small function to initiate the file and only write the headers when starting the script. There isn't really a better way, as in, all other ways are way more complicated.
– Imre_G
Nov 13 '18 at 14:29
Sorry if I keep asking, but I didn't want to completely remove the header haha. What I meant was, for the first entry, it prints out the header, and subsequent entries, it just fills in without the header.
– Azaqi
Nov 13 '18 at 14:41
You roughly have three options. 1) Open the file before you write to see if there are headers there. Then write headers if they are not there yet. This is terrible for performance, but hey, it works. 2) Write a file init function which you call once when the script starts. A bit hacky, but depending on your level of seriousness might be the easiest option. 3) Define an object and make the insert_student method a method of that object. Then you can keep a variable "headers_added" or something similar in object state. If you are serious, this is the best option. Your call.
– Imre_G
Nov 13 '18 at 18:00
add a comment |
0
0
0
Open the file in 'a' mode:
filePath = "data.csv"
with open(filePath, 'a', newline='') as csvfile:
fieldnames = ['first_name', 'last_name', 'student_id']
writer = csv.DictWriter(csvfile, fieldnames=fieldnames)
writer.writerow('first_name': first_name,
'last_name': last_name,
'student_id': student_id)
print("New Student Record Inserted")
answered Nov 13 '18 at 14:19
Imre_GImre_G
912720
Open the file in 'a' mode:
filePath = "data.csv"
with open(filePath, 'a', newline='') as csvfile:
fieldnames = ['first_name', 'last_name', 'student_id']
writer = csv.DictWriter(csvfile, fieldnames=fieldnames)
writer.writerow('first_name': first_name,
'last_name': last_name,
'student_id': student_id)
print("New Student Record Inserted")
answered Nov 13 '18 at 14:19
Imre_GImre_G
912720
edited Nov 13 '18 at 14:31
answered Nov 13 '18 at 14:19
Imre_GImre_G
912720
answered Nov 13 '18 at 14:19
Imre_GImre_G
912720
answered Nov 13 '18 at 14:19
Imre_GImre_G
912720
912720
It sort of works, but it keeps writing the header everytime there is a new entry. Any workaround?
– Azaqi
Nov 13 '18 at 14:24
Yeah take the fieldnames out of the loop. See edited answer. What you could do is write a small function to initiate the file and only write the headers when starting the script. There isn't really a better way, as in, all other ways are way more complicated.
– Imre_G
Nov 13 '18 at 14:29
Sorry if I keep asking, but I didn't want to completely remove the header haha. What I meant was, for the first entry, it prints out the header, and subsequent entries, it just fills in without the header.
– Azaqi
Nov 13 '18 at 14:41
You roughly have three options. 1) Open the file before you write to see if there are headers there. Then write headers if they are not there yet. This is terrible for performance, but hey, it works. 2) Write a file init function which you call once when the script starts. A bit hacky, but depending on your level of seriousness might be the easiest option. 3) Define an object and make the insert_student method a method of that object. Then you can keep a variable "headers_added" or something similar in object state. If you are serious, this is the best option. Your call.
– Imre_G
Nov 13 '18 at 18:00
add a comment |
It sort of works, but it keeps writing the header everytime there is a new entry. Any workaround?
– Azaqi
Nov 13 '18 at 14:24
Yeah take the fieldnames out of the loop. See edited answer. What you could do is write a small function to initiate the file and only write the headers when starting the script. There isn't really a better way, as in, all other ways are way more complicated.
– Imre_G
Nov 13 '18 at 14:29
Sorry if I keep asking, but I didn't want to completely remove the header haha. What I meant was, for the first entry, it prints out the header, and subsequent entries, it just fills in without the header.
– Azaqi
Nov 13 '18 at 14:41
You roughly have three options. 1) Open the file before you write to see if there are headers there. Then write headers if they are not there yet. This is terrible for performance, but hey, it works. 2) Write a file init function which you call once when the script starts. A bit hacky, but depending on your level of seriousness might be the easiest option. 3) Define an object and make the insert_student method a method of that object. Then you can keep a variable "headers_added" or something similar in object state. If you are serious, this is the best option. Your call.
– Imre_G
Nov 13 '18 at 18:00
It sort of works, but it keeps writing the header everytime there is a new entry. Any workaround?
– Azaqi
Nov 13 '18 at 14:24
It sort of works, but it keeps writing the header everytime there is a new entry. Any workaround?
– Azaqi
Nov 13 '18 at 14:24
Yeah take the fieldnames out of the loop. See edited answer. What you could do is write a small function to initiate the file and only write the headers when starting the script. There isn't really a better way, as in, all other ways are way more complicated.
– Imre_G
Nov 13 '18 at 14:29
Yeah take the fieldnames out of the loop. See edited answer. What you could do is write a small function to initiate the file and only write the headers when starting the script. There isn't really a better way, as in, all other ways are way more complicated.
– Imre_G
Nov 13 '18 at 14:29
Sorry if I keep asking, but I didn't want to completely remove the header haha. What I meant was, for the first entry, it prints out the header, and subsequent entries, it just fills in without the header.
– Azaqi
Nov 13 '18 at 14:41
Sorry if I keep asking, but I didn't want to completely remove the header haha. What I meant was, for the first entry, it prints out the header, and subsequent entries, it just fills in without the header.
– Azaqi
Nov 13 '18 at 14:41
You roughly have three options. 1) Open the file before you write to see if there are headers there. Then write headers if they are not there yet. This is terrible for performance, but hey, it works. 2) Write a file init function which you call once when the script starts. A bit hacky, but depending on your level of seriousness might be the easiest option. 3) Define an object and make the insert_student method a method of that object. Then you can keep a variable "headers_added" or something similar in object state. If you are serious, this is the best option. Your call.
– Imre_G
Nov 13 '18 at 18:00
You roughly have three options. 1) Open the file before you write to see if there are headers there. Then write headers if they are not there yet. This is terrible for performance, but hey, it works. 2) Write a file init function which you call once when the script starts. A bit hacky, but depending on your level of seriousness might be the easiest option. 3) Define an object and make the insert_student method a method of that object. Then you can keep a variable "headers_added" or something similar in object state. If you are serious, this is the best option. Your call.
– Imre_G
Nov 13 '18 at 18:00
add a comment |
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You need to open your file in append mode if you want to modify it more than once.
– toti08
Nov 13 '18 at 14:17