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[英]Pandas read_csv: AttributeError: 'NoneType' object has no attribute 'dtype'
[英]AttributeError: 'Read_csv' object has no attribute 'datetime_array'
我正在开发一个软件,它可以读取 csv 文件并为每一列创建一个列表。 在另一个class中,我想把plot的数据包含在第一个ZA2F2ED4F8EBC2CBB4DZC21A29的arrays中
我收到此错误:
AttributeError: 'Read_csv' object 没有属性 'datetime_array'
我该如何解决? 这些是我的课。
Csv_Reader
:
import pandas as pd
from datetime import datetime
#from csv import reader
class Read_csv:
def csv_reader(self, file_name):
df = pd.read_csv(file_name, delimiter = ';')
self.datetime_array = list(map(lambda x: datetime.strptime(x, '%Y-%m-%d %H:%M:%S.%f'), df["DateTime"]))
self.vet_values_s1 = df["S1"].tolist()
self.vet_values_s2 = df["S2"].tolist()
self.vet_values_s3 = df["S3"].tolist()
print(self.datetime_array, self.vet_values_s1, self.vet_values_s2, self.vet_values_s3)
Data_Plotter
:
import numpy
import matplotlib.pyplot as plt
import matplotlib.patches as mpatches
from Csv_Reader import Read_csv
class Data_plotter:
def __init__(self, datetime_array, vet_values_s1, vet_values_s2, vet_values_s3):
self.datetime_array = datetime_array
self.vet_values_s1 = vet_values_s1
self.vet_values_s2 = vet_values_s2
self.vet_values_s3 = vet_values_s3
def plot_data(self):
plt.plot(self.vet_values_s1, color = 'green')
plt.plot(self.vet_values_s2, color = 'red')
plt.plot(self.vet_values_s3, color = 'blue')
plt.title('Test')
plt.xlabel('DateTime')
plt.ylabel('Signals Values')
plt.xticks(numpy.arange(len(self.datetime_array)), self.datetime_array, rotation=90)
green = mpatches.Patch(color='green',label='S1')
red = mpatches.Patch(color='red',label='S2')
blue = mpatches.Patch(color='blue',label='S3')
plt.legend(handles=[green,red,blue])
plt.grid(True)
plt.savefig("Test")
main
:
from Csv_Reader import Read_csv
from Data_Plotter import Data_plotter
reader_obj = Read_csv()
Read_csv().csv_reader('Signals_informations.csv')
obj = Data_plotter(reader_obj.datetime_array, reader_obj.vet_values_s1, reader_obj.vet_values_s2, reader_obj.vet_values_s3)
obj.plot_data()
我的 csv 文件:
DateTime;S1;S2;S3
2020-07-16 15:11:34.358231;677.0552427707063;787.6245155900142;543.0755073183745
2020-07-16 15:11:34.360247;535.4790551706492;317.65859520197984;218.64223032216418
2020-07-16 15:11:34.362263;451.9436928722545;449.5560971162404;215.33038976545765
2020-07-16 15:11:34.364279;72.31352267938303;251.55939892326035;896.9233907560412
2020-07-16 15:11:34.366295;758.7365312885398;686.7909954314093;303.9852170969752
2020-07-16 15:11:34.368311;593.8244329562257;698.5981983561348;369.11408762777785
2020-07-16 15:11:34.370327;338.56552989499176;469.327619765774;331.0295457896333
2020-07-16 15:11:34.372343;729.3276090259968;690.776181594403;97.6830657885398
2020-07-16 15:11:34.374359;284.58252864976197;569.0028638781417;196.02767689983673
2020-07-16 15:11:34.376375;909.5920826056772;178.28447193362686;240.4015082916274
更改此行:
Read_csv().csv_reader('Signals_informations.csv')
至
reader_obj.csv_reader('Signals_informations.csv')
使用Read_csv()
您正在创建一个新的 object 而不是使用您已经创建的 ( reader_obj
) 并在下一行中使用。
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