在 Python 中仅清除部分屏幕

Question

所以基本上我正在尝试为 python 应用程序创建一个基于文本的用户界面。这是我到目前为止得到的：

#!/usr/bin/env python
# encoding: utf-8

from blessed import Terminal
import sqlite3
import sys
import os

reload(sys)
sys.setdefaultencoding("UTF-8")

db = sqlite3.connect('/Users/JoaoPedro/Desktop/PyTest/Alunos')
c = db.cursor()

term = Terminal()

os.system('clear')

def main (self):

print (term.yellow("  CICS   000009/1           Centro Educacional Charles Darwin                 z\OS 3.2   "))
print (term.yellow("  TERMINAL: 2297              Sistema de Controle de Notas                  VITÓRIA/ES   "))
print (term.yellow(" ======================================================================================= "))
print (term.move_y(28)) + (term.yellow(" ======================================================================================= "))
matricula = raw_input (term.move(4, 7) + "Matrícula: ")

os.system('clear')

print (term.yellow("  CICS   000009/1           Centro Educacional Charles Darwin                 z\OS 3.2   "))
print (term.yellow("  TERMINAL: 2297              Sistema de Controle de Notas                  VITÓRIA/ES   "))
print (term.yellow(" ======================================================================================= "))
print
print (term.cyan("       Matrícula    Nome                              Série   Turma      Nota "))

if matricula in ["/", ""]:

    c.execute('select * from A ORDER BY nome')
    rows = c.fetchall()

else:

    c.execute('select * from A WHERE matricula = ?', (matricula,))
    rows = c.fetchall()

for row in rows:
    print (term.white((term.move_x(9)) + row[0] + (term.move_x(20)) + row[1] + (term.move_x(56)) + row[2] + (term.move_x(64)) + row[3] + (term.move_x(73)) + row[4]))
print (term.move_y(28)) + (term.yellow(" ======================================================================================= "))
command = raw_input (term.move(27, 2) + "Comando ===> ")
if command == "X":
    os.system('clear')
    sys.exit()
else:
    os.system('clear')
    main('self')


main('self')

如您所见，每次发生新查询时，我都必须打印顶部和底部。现在，这对于像这样的小型应用程序来说工作得很好，但如果我向它添加更多功能，我将不得不每次都重复相同的代码行（顶部和底部）。

我想知道是否有任何方法可以使顶部和底部保持静止，只允许程序清除中间的区域...？

Answer 1

不要调用os.system('clear')，只需在要清除的屏幕行中写入space个字符即可。或者，只需写入新内容，用 spaces 填充到行尾以清除之前的任何内容。

Answer 2

我对 blessed 不熟悉，但考虑到以下问题：

I'll have to repeat the same line of code (top and bottom) every time.

如果您发现自己在重复相同的代码行，请使用函数。

把这个放在上面"def main (self):"

def drawTop():
    print (term.yellow("  CICS   000009/1           Centro Educacional Charles Darwin                 z\OS 3.2   "))
    print (term.yellow("  TERMINAL: 2297              Sistema de Controle de Notas                  VITÓRIA/ES   "))
    print (term.yellow(" ======================================================================================= "))

并用

替换三个打印行的每个出现

drawTop()

在 Python 中仅清除部分屏幕

Clear only part of the screen in Python

python

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