如何实现用户input()每日仅可输入一次？基于现有代码的优化问询

Great question! The core idea here is to persistently track the last date the user submitted input so your program can check if today’s already had a submission before prompting again. Timestamp works, but comparing full dates is simpler for this use case. Let’s modify your code step by step:

Step 1: Add Dependencies & Helper Function #

We’ll use datetime to handle date checks and os to manage a small storage file (so we don’t crash if the file doesn’t exist yet). Add these imports at the top:

import datetime
import os

Then create a helper function to verify if the user has already submitted today:

def has_submitted_today():
    # File to store the last submission date
    date_file = "last_submission.txt"
    if not os.path.exists(date_file):
        return False
    
    # Read the stored date from the file
    with open(date_file, "r") as f:
        last_date_str = f.read().strip()
    
    # Get today's date formatted as a string (YYYY-MM-DD)
    today = datetime.date.today().strftime("%Y-%m-%d")
    
    # Check if last submission was on today
    return last_date_str == today

Step 2: Update Input Logic & Submission Flow #

Modify your existing functions to only ask for input if no submission exists for today:

def inputQ1(): 
    while True: 
        try: 
            Q1A = int(input("Rate your exercise today on scale 1-100: "))
            # Optional: Validate the rating is within 1-100
            if not 1 <= Q1A <= 100:
                print("Please enter a number between 1 and 100!")
                continue
        except ValueError: 
            print("Invalid value - please enter an integer.") 
            continue 
        else: 
            return Q1A 

# Initialize your answer list
ansQ1 = [] 

# Only prompt for input if no submission today
if not has_submitted_today():
    user_rating = inputQ1()
    ansQ1.append(user_rating)
    print(f"Thanks! Your rating {user_rating} has been saved.")
    
    # Save today's date to the storage file
    with open("last_submission.txt", "w") as f:
        f.write(datetime.date.today().strftime("%Y-%m-%d"))
else:
    print("You've already submitted your exercise rating today! Come back tomorrow.")

print(ansQ1)

How This Works #

• Persistent Storage: The last_submission.txt file retains the last submission date even after the program closes. This ensures the check works across sessions.
• Simple Date Comparison: By converting dates to a YYYY-MM-DD string format, we avoid complex timestamp math and make the check straightforward.
• Extra Validation: I added a check to ensure the user enters a valid 1-100 rating (matching your prompt) — feel free to remove this if you don’t need it.

Quick Notes #

• To test the logic again before tomorrow, just delete the last_submission.txt file.
• For a more robust solution (e.g., tracking multiple users), you could use a small database like SQLite, but a text file is perfect for this simple use case.

内容的提问来源于stack exchange，提问作者0myjoe