陳昕妤LIST清單DICT字典RANDOM模組
#註解陳昕妤學過python
import random
x=[i for i in range(10)]
print('產生清單',x)
y={}
for i in x:
y[i]=random.random()
print(y)
for i in y:
print(i,y[i])
陳昕妤python運算CSV輸出TKINTER投資風險與報酬Markowitz 6月 19, 2025
import csv #輸入csv套件comma separated value f = open('200201to202505.csv','r', encoding="utf-8")#打開下載的檔案SPY.CSV,模式是r讀取, csvreader = csv.reader(f) #將檔案讀入變數csvreader header, rows = list(), list() #宣告空白串列(陣列,清單) firms = set() #建構集合 header = next(csvreader) #串列header儲存檔案第一列 for record in csvreader: #檔案紀錄，逐列row檢視 rows.append(record) #第i筆附加append於rows串列成為rows[i] firms.add(record[0]) #row[0]公司名稱 f.close() #關閉檔案 months = dict() for year in range(2007,2026): months[year]=[str(year*100+month) for month in range(1,13)] count, sum, sumSq, mean, stdev = dict(), dict(), dict(), dict(), dict() for firm in firms: for year in range(2007, 2026): t = (firm, year) #元組(公司,年) count[t] = 0 sum[t] = 0.0 sumSq[t] = 0.0 for row in rows: #字典value增加append元素 for firm in firms: if row[0] == firm...
620有執行嗎？https://cynthiachen59.blogspot.com/2025/06/blog-post.html
回覆刪除https://cynthiachen59.blogspot.com/2025/06/listdictrandom.html