從文件讀取數據到二維數組[Python]

Question

我有一個像這樣的.txt文件：

8.3713312149,0.806817531586,0.979428482338,0.20179159543
5.00263547897,2.33208847046,0.55745770379,0.830205341157
0.0087910592556,4.98708152771,0.56425779093,0.825598658777

我想將數據保存在二維數組中，例如

array = [[8.3713312149,0.806817531586,0.979428482338,0.20179159543],[5.00263547897,2.33208847046,0.55745770379,0.830205341157],[0.0087910592556,4.98708152771,0.56425779093,0.825598658777]

我嘗試了這段代碼

#!/usr/bin/env python

checkpoints_from_file[][]

def read_checkpoints():
    global checkpoints_from_file
    with open("checkpoints.txt", "r") as f:
        lines = f.readlines()
        for line in lines:
            checkpoints_from_file.append(line.split(","))
        print checkpoints_from_file


if __name__ == '__main__':
    read_checkpoints()

但它不起作用。 你們能告訴我如何解決嗎？ 謝謝

Answer 1

從您的文件中讀取

def read_checkpoints():
    checkpoints_from_file = []
    with open("checkpoints.txt", "r") as f:
        lines = f.readlines()
        for line in lines:
            checkpoints_from_file.append(line.split(","))
        print(checkpoints_from_file)


if __name__ == '__main__':
    read_checkpoints()

---

或者假設您可以使用字符串文字成功讀取此數據，

list_ = [[decimal for decimal in line.split(",")] for line in lines.split("\n")]

和列表理解，

checkpoints_from_file = []
for line in lines.split("\n"):
    list_of_decimals = []
    for decimal in line.split(","):
        list_of_decimals.append(decimal)
    checkpoints_from_file.append(list_of_decimals)

print(checkpoints_from_file)

展開，

 checkpoints_from_file = [] for line in lines.split("\\n"): list_of_decimals = [] for decimal in line.split(","): list_of_decimals.append(decimal) checkpoints_from_file.append(list_of_decimals) print(checkpoints_from_file) 

---

您的錯誤：

1. 與某些語言不同，在Python中，您不需要初始化清單清單checkpoints_from_file[][] ，而可以初始化一維清單checkpoint_from_file = [] 。 然后，您可以使用Python的list.append()在其中插入更多列表。

Answer 2

您的代碼中有兩個錯誤。 首先是checkpoints_from_file[][]不是在Python中初始化多維數組的有效方法。 相反，您應該寫

checkpoints_from_file = [] 

這將初始化一維數組，然后在循環中向其附加數組，從而使用數據創建一個2D數組。

您也將條目作為字符串存儲在數組中，但是您可能希望它們為浮點型。 您可以使用float函數以及列表推導來完成此操作。

checkpoints_from_file.append([float(x) for x in line.split(",")])