在Python中只清除部分屏幕

时间:2015-12-27 08:30:03

标签: python tui

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

#!/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')

正如您所看到的,每次发生新查询时,我都必须打印顶部和底部。现在,这对于像这样的小应用程序来说效果很好,但如果我向它添加更多功能,我每次都必须重复相同的代码行(顶部和底部)。

我想知道是否有任何方法可以保持顶部和底部静止,只允许程序清除它们之间的区域......?

2 个答案:

答案 0 :(得分:2)

请勿调用os.system('clear'),只需在要清除的屏幕行中写入空格字符。或者,只需编写新内容,并使用空格填充到行尾以清除之前的任何内容。

答案 1 :(得分:1)

我不熟悉幸福,但考虑到以下问题:

  

我每次都必须重复相同的代码行(顶部和底部)。

如果您发现自己重复相同的代码行,请使用函数。

将上面的内容放在" 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()