在 python 的终端中插入输入时更改图标

Question

我正在 python 的终端中创建一个登录面板，我想在输入之前动态更改图标，即每当用户填写输入时，图标就会更改。

例子：

F:\command_line>python main.py
?  username: # initially there is a question mark.

✓ username: # If the user fills the username the icon changes to ✓

我试过了：

default = '?'
onChange = '✓'
inp = input(default + " " + name + ":")
# I can't figure out how I can change it

可以这样做吗？如果是这样，我该如何实现？

Answer 1

我不会带您了解整个过程，但@PranavHosangadi 提供的链接是一个很好的资源。

您似乎使用的是 Windows，因此您无法立即使用 curses 模块。但是，您可以pip install windows-curses 获得大部分功能。虽然我注意到 curses.KEY_BACKSPACE 等一些常量在 Windows 版本上有所不同，但您可以调整它并确定适合您的。

# The module you'll use
import curses

# this is the char value that backspace returns on windows
BACKSPACE = 8

# our main function
def main(stdscr):
    # this is just to initialize the input position
    inp = '? Username:'
    stdscr.addstr(1, 1, inp)
    
    # The input from the user will be assigned to 
    # this variable
    current = ''
    # our main method of obtaining user input
    # it essentially returns control after the 
    # user inputs a character
    # the return value is essentially what ord(char) returns
    # to get the actual character you can use chr(char)
    k = stdscr.getch()

    # break the loop when the x key is pressed
    while chr(k) != 'x':
        # remove characters for backspace presses
        if k == BACKSPACE:
            if len(current):
                current = current[:len(current) - 1]
        # only allow a max of 8 characters
        elif len(current) < 8:
            current = current + chr(k)
        
        # when 8 characters are entered, change the sign
        if len(current) == 8:
            inp = '! Username:'
        else:
            inp = '? Username:'
        
        # not clearing the screen leaves old characters in place
        stdscr.clear()
        # this enters the input on row 1, column 1
        stdscr.addstr(1, 1, inp + current)
        
        # get the next user input character
        k = stdscr.getch()

if __name__ == '__main__':
    # our function needs to be driven by curses.wrapper
    curses.wrapper(main)

一些资源：

Official Docs

Some helpful examples 这个有一些仅限 linux 的部分，但经过一些试验和错误，这些部分是显而易见的。