問題：解決如何在python中對錶格（二維）進行排序？例如，按照cpu或mem的使用率對top中的程序排序

解決方法：
1. 使用numpy或者panda中的方法對二維矩陣進行操作
2. 使用二維陣列（list）儲存表格，然後按照某一列排序

下面實現方法二
假設top資訊存在於與指令碼同目錄的txt檔案中。具體資訊如下：

step1：將文字內容讀入list存放

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

lines = []
#read txt file line by line and stored in list
with
 
 open('top_info.txt', 'r') as f:
    lines = f.readlines()

print(len(lines))


print("initialize arrays:")
lines_len = len(lines) - 7       #info need to process
cols_name = [i for i in lines[6].split()]
arrays = [[0 for i in lines[6].split()] for i in range(lines_len)]                #initialize matrix
 


print(cols_name)
print(len(arrays))
print(*arrays, sep='\n')   #print element in multi lines

執行結果：

step2 : 將要處理的幾行資訊單獨儲存

#gets into needs to process
for i in range(7, len(lines)):
    arrays[i-7] = lines[i].split()

print(arrays[0])
print(arrays[1])
print(arrays[2])

執行結果：

step3 : 按照cpu和mem的使用率排序，降序

關鍵程式碼：

from operator import itemgetter

print("sort info:")
#cpu_row = [row[8] for row in arrays]
arrays_sorted_by_cpu = sorted(arrays, key=itemgetter(8), reverse = True)
print(*arrays_sorted_by_cpu, sep='\n')

執行結果：

完整程式碼：

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
from operator import itemgetter

lines = []
#read txt file line by line and stored in list
with open('top_info.txt', 'r') as f:
    lines = f.readlines()

print("the top info in doc is: \n")
print(*lines, sep='\n')

lines_len = len(lines) - 7       #info need to process
arrays = [[0 for i in lines[6].split()] for i in range(lines_len)]

#gets into needs to process
for i in range(7, len(lines)):
    arrays[i-7] = lines[i].split()

print("sort info:")
arrays_sorted_by_cpu = sorted(arrays, key=itemgetter(8), reverse = True)
print(*arrays_sorted_by_cpu, sep='\n')

執行結果：