如何在Python的input命令中逐字符打印且避免出现None？

Got it, let's break down why that None is showing up and fix it quickly!

The problem here is that your delay_print function doesn't explicitly return anything—Python automatically returns None for functions without a return statement. When you pass delay_print("\nGET UP? Y/N: ") as an argument to input(), two things happen:

1. First, delay_print runs and prints your prompt character by character.
2. Then, input() takes the return value of delay_print (which is None), converts it to a string, and prints that right after your prompt. That's where the random None comes from!

Two easy fixes: #

1. Separate the print and input calls (recommended)

This is the cleanest approach—just print your prompt first, then get input without an extra prompt:

# Print your delayed prompt
delay_print("\nGET UP? Y/N: ")
# Grab user input (no extra prompt needed)
GetUp = input()

This keeps your code straightforward and avoids any weird interactions between delay_print and input().

2. Modify delay_print to return an empty string

If you really want to keep the function call inside input(), update delay_print to return an empty string instead of None. This way, input() gets an empty prompt and won't print anything extra:

import time
import sys
def delay_print(s):
    for c in s:
        sys.stdout.write(c)
        sys.stdout.flush()
        time.sleep(0.2)
    return ""  # Add this line to return empty string

GetUp = input(delay_print("\nGET UP? Y/N: "))

Either way, you'll get the delayed prompt you want without that annoying None popping up. Happy game development!

内容的提问来源于stack exchange，提问作者vanko003