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[英]I need to import data from a text file as a list in Python 3 and have the program run a function for each item
[英]read in data from a text file and have each column as a list in python
這是我要導入的文本文件中的數據:
-2, 2.1, 0.484147876841
0, 2.4, 0.0550985751073
2, 2.5, -0.48502362586
4, 3.5, -0.161922119386
6, 4.2, 0.442947234586
我希望將每一列數據都放在一個單獨的列表中,如下所示:
x = [-2, 0,2 ,4 ,6]
y = [2.1, 2.4, 2.5, 3.5, 4.2]
e = [0.484147876841, 0.0550985751073, -0.48502362586, -0.161922119386, 0.442947234586]
我嘗試了以下代碼:
inputdata=open("C:\Users\Chloe\Google Drive\Uni\Computing\data.txt", 'r')
for datapoint in inputdata:
datapoint=datapoint.strip('\n')
splitdata=datapoint.split(',')
x.append(splitdata[0])
y.append(splitdata[1])
e.append(splitdata[2])
您收到什么錯誤? 試試這個,對我有用:
inputdata=open("C:\Users\Chloe\Google Drive\Uni\Computing\data.txt", 'r')
x = []
y= []
e = []
for datapoint in inputdata:
datapoint=datapoint.strip('\n')
splitdata=datapoint.split(',')
x.append(int(splitdata[0]))
y.append(float(splitdata[1]))
e.append(float(splitdata[2]))
print x
print y
print e
輸出 :
[-2, 0, 2, 4, 6]
[2.1, 2.4, 2.5, 3.5, 4.2]
[0.484147876841, 0.0550985751073, -0.48502362586, -0.161922119386, 0.442947234586]
這是一種實現方法:
input_file = 'data.txt'
with open(input_file) as f:
a = [map(float, line.strip('\n').split(',')) for line in f]
x, y, z = [list(l) for l in zip(*a)]
print(x, y, z)
印刷品:
[-2.0, 0.0, 2.0, 4.0, 6.0] [2.1, 2.4, 2.5, 3.5, 4.2] [0.484147876841, 0.0550985751073, -0.48502362586, -0.161922119386, 0.442947234586]
如果您不介意x
, y
和z
將是元組,則可以僅使用zip(*a)
而不是在最后一個列表理解中用列表包裝每個元素。
首先,您可能需要轉換為正確的數據類型:
x.append(int(splitdata[0]))
y.append(float(splitdata[1]))
e.append(float(splitdata[2]))
...
其次,這是一個csv文件,您最好使用正確的庫對其進行處理:
import csv
with open(r"C:\Users\Chloe\Google Drive\Uni\Computing\data.txt", 'rb') as csvfile:
reader = csv.reader(csvfile):
for row in file:
x.append(int(row[0]))
...
file1=open("D:\price.txt","r")
x=[]
y=[]
z=[]
for i in file1:
x.append(i.strip().split())
print(x)
for i in x:
y.append(int(i[0]))
z.append(int(i[1]))
print(y,z)
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