An obvious scenario that you may have to deal with is having to delete a user record/row from a file. For instance, you may need to specify the username, and then delete that user's whole record. This would involve deleting just one particular row from the file in python. The following code shows you how to do this. Note that it isn't so straightforward as directly deleting the row you want. Consider the algorithm involved as you analyse the code and what it does! See if you can write your own version of something similar but different.
Code
""" ==============TASK
1. Search for any given username
2. Delete the whole row for that particular user
e.g.
Enter username: marvR
>>The record for marvR has been deleted from file.
"""
import csv
def main():
#1. This code snippet asks the user for a username and deletes the user's record from file.
updatedlist=[]
with open("fakefacebook.txt",newline="") as f:
reader=csv.reader(f)
username=input("Enter the username of the user you wish to remove from file:")
for row in reader: #for every row in the file
if row[0]!=username: #as long as the username is not in the row .......
updatedlist.append(row) #add each row, line by line, into a list called 'udpatedlist'
print(updatedlist)
updatefile(updatedlist)
def updatefile(updatedlist):
with open("fakefacebook.txt","w",newline="") as f:
Writer=csv.writer(f)
Writer.writerows(updatedlist)
print("File has been updated")
main()
File Contents
username,password,email,no_of_likes marvR,pass123,[email protected],400 smithC,open123,[email protected],200 blogsJ,2bg123,[email protected],99
Output
test data: marvR ....would delete the entire record or row for marvR
username,password,email,no_of_likes smithC,open123,[email protected],200 blogsJ,2bg123,[email protected],99
Check user's response and respond accordingly. (for instance, responses like: "that's right", or "that's wrong")
You can extend this validation to make it as complex as you like. You could also experiment with additional validation techniques you have come across before. For now, just ensure the user cannot input numbers.
What's a quiz without a score? In this part, get the score working. Add +1 to the score every time the user gets an answer right. Ensure the score is added up at the end of the three questions.
Modular programming is important. It's quite crucial to have code organised into functions for reasons you have covered in your theory lessons! As you put the existing code into a function, don't forget to get your indentation right.
Using the skills that you have already picked up, it shouldn't be too difficult to simply write the name of the user and their score to a text file called scores.txt
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