from __future__ import print_function from pandas import DataFrame,Series import pandas as pd datafile='/root/dataset/air_customer_Data/air_data.csv' data=pd.read_csv(datafile,encoding='utf-8') cleanedfile='cleaned.csv' data1=data[data['SUM_YR_1'].notnull() & data['SUM_YR_2'].notnull()] data1 index1=data['SUM_YR_1']!=0 index2=data['SUM_YR_2']!=0 index3=data['SEG_KM_SUM']>0 data1 = data1[(index1 | index2) & index3] data1.to_csv(cleanedfile) data2=data1[['LOAD_TIME','FFP_DATE','LAST_TO_END','FLIGHT_COUNT','SEG_KM_SUM','avg_discount']] data2.to_csv('datadecrese.csv') 3 import numpy as np data=pd.read_csv('datadecrese.csv') data['L']=pd.to_datetime(data['LOAD_TIME'])-pd.to_datetime(data['FFP_DATE']) data['L'] =data['L'].astype("str").str.split().str[0] # 去除数据中的days字符，只输出数字，再转化为数值型数据 data['L'] = data['L'].astype("int") / 30 data.drop(columns=['LOAD_TIME','FFP_DATE'], inplace=True) data.rename(columns = {'LAST_TO_END':'R','FLIGHT_COUNT':'F','SEG_KM_SUM':'M','avg_discount':'C'},inplace=True) data.drop(columns=['Unnamed: 0'], inplace=True) 4 data.describe() 5 P108 data=(data-data.mean())/data.std() 6 import pandas as pd from pandas import DataFrame,Series from sklearn.cluster import KMeans k=5 kmodel=KMeans(n_clusters=k,random_state=3) kmodel.fit(data) 7 import matplotlib import matplotlib.pyplot as plt clu=kmodel.cluster_centers_ x=[1,2,3,4,5] plt.rcParams['font.sans-serif'] = 'SimHei' plt.rcParams['axes.unicode_minus'] = False for i in range(5): plt.plot(x,clu[i]) plt.show

opening_a_file_python:Jupytr Notebook用于在python演示文稿中打开文件

import pandas as pd data = pd.read_csv('dataset.csv') 这会将CSV文件加载到一个DataFrame对象中，便于进一步分析。 4. **保存DataFrame为CSV文件**：同样，pandas提供了to_csv()方法将DataFrame...

Web Scraper Data Cleaning and Preprocessing Techniques: Data Cleaning and Transformation Using Pandas

# Advanced篇: Web Scraping Data Cleaning and Preprocessing Techniques: Using Pandas for Data Cleaning and Transformation ## 2.1 Introduction to Pandas Data Structures and Operations ### 2.1.1 An ...

Pandas数据预处理

在现代数据科学中，Pandas库成为处理和分析数据的必备工具。它是基于Python语言的数据分析库，提供了一种高效、直观的方式来操作数据。数据预处理是数据分析的重要步骤，它涉及清理、整合、格式化以及转换数据使之...

class myDataset(Dataset): def init(self, csv_file, txt_file, root_dir, other_file): self.csv_data = pd.read_csv(csv_file) with open(txt_file, 'r') as f: data_list = f.readlines() self.txt_data = data_list self.root_dir = root_dir def ien(self): return len(self.csv_data) def getitem(self, idx): data = (self.csv_data[idx], self.txt_data[idx]) return data

from torch.utils.data import Dataset class myDataset(Dataset): def __init__(self, csv_file, txt_file, root_dir, other_file): self.csv_data = pd.read_csv(csv_file) with open(txt_file, 'r') as f: ...

if name == 'main': parser = argparse.ArgumentParser() parser.add_argument('--path', type=str, default=r"data/UCI HAR Dataset/UCI HAR Dataset", help='UCI dataset data path') parser.add_argument('--save', type=str, default='data/UCI_Smartphone_Raw.csv', help='save file name') args = parser.parse_args() data_path = args.path # read train subjects train_subjects = pd.read_csv(os.path.join(data_path, 'train/subject_train.txt'), header=None, names=['subject']) # read test subjects test_subjects = pd.read_csv(os.path.join(data_path, 'test/subject_test.txt'), header=None, names=['subject']) # concat subjects = pd.concat([train_subjects, test_subjects], axis=0) # read train labels train_labels = pd.read_csv(os.path.join(data_path, 'train/y_train.txt'), header=None, names=['label']) # read train labels test_labels = pd.read_csv(os.path.join(data_path, 'test/y_test.txt'), header=None, names=['label']) # labels labels = pd.concat([train_labels, test_labels], axis=0) final_dataframe = pd.concat([subjects, labels], axis=1) data = [] for name in COLUMNS: final_dataframe = pd.concat([final_dataframe, read_txt(name)], axis=1) final_dataframe.to_csv(args.save,index=False) 如何将文中txt文件改成mnist数据集数据，其他不做大修改

import pandas as pd from sklearn.datasets import fetch_openml 2. 加载MNIST数据集： python mnist = fetch_openml('mnist_784', version=1, cache=True) 3. 将图像矩阵和标签分别存储为numpy数组...

import netCDF4 import geopandas as gpd import numpy as np import pandas as pd # 加载nc文件 nc_file = netCDF4.Dataset('E:/data/temp_CMFD_V0106_B-01_01mo_010deg_197901-201812.nc') temp_data = nc_file.variables['temp'][:] # 加载shp文件 shp_file = gpd.read_file('D:/dilidashuju/shijiquhua.shp') # 计算每个市级行政区的平均温度 years = range(1979, 2018) months = range(1, 13) temp_df = pd.DataFrame(columns=['year', 'month', 'city', 'temperature']) for year in years: for month in months: temp_array = temp_data[(year-1979)*12+month-1, :, :] for i, row in shp_file.iterrows(): city_name = row['市'] city_geom = row['geometry'] temp_mean = np.mean(temp_array[np.array([city_geom.contains(Point(lon, lat)) for lon, lat in zip(temp_array.lon, temp_array.lat)])]) temp_df = temp_df.append({'year': year, 'month': month, 'city': city_name, 'temperature': temp_mean}, ignore_index=True) # 将结果保存到CSV文件中 temp_df.to_csv('city_temperature.csv', index=False)这串代码报错Traceback (most recent call last): File "C:\Users\Lenovo\PycharmProjects\pythonditu\main.py", line 24, in <module> temp_mean = np.mean(temp_array[np.array([city_geom.contains(Point(lon, lat)) for lon, lat in zip(temp_array.lon, temp_array.lat)])]) AttributeError: 'MaskedArray' object has no attribute 'lon'怎么修改

要解决此错误，可以使用 data 属性来访问 temp_array 的实际数据数组，如下所示： temp_mean = np.mean(temp_array.data[np.array([city_geom.contains(Point(lon, lat)) for lon, lat in zip(temp_array....

import nltk.corpus import pandas as pd import re import matplotlib.pyplot as plt import seaborn as sns from stanfordcorenlp import StanfordCoreNLP # 导入数据 df = pd.read_csv('D:/file document/desktop/语料库大作业/Tweets.csv', usecols=['airline_sentiment', 'text']) def sentiment(x): if x == 'positive': return 1 elif x == 'negative': return -1 else: return 0 from nltk.corpus import stopwords from nltk.stem import SnowballStemmer from nltk.tokenize import RegexpTokenizer # 去除停用词 stopwords = nltk.corpus.stopwords.words('english') # 词还原 stemmer = SnowballStemmer('english') # 分词 tokenizer = RegexpTokenizer(r'\w+') # As this dataset is fetched from twitter so it has lots of people tag in tweets # we will remove them tags = r"@\w*" def preprocess_text(sentence, stem=False): # 去除text中一些影响文本分析的标签 sentence = [re.sub(tags, "", sentence)] text = [] for word in sentence: if word not in stopwords: if stem: text.append(stemmer.stem(word).lower()) else: text.append(word.lower()) return tokenizer.tokenize(" ".join(text)) # 将用preprocess_text() 函数处理后的text列保存回原始 DataFrame 的 text 列中 df['text'] = df['text'].map(preprocess_text) output_file = 'D:/file document/desktop/语料库大作业/output2.csv' # 输出文件路径 nlp = StanfordCoreNLP(r"D:/AppData/stanfordnlp", lang="en") # 定义函数，用于对指定文本进行依存句法分析 def dependency_parse(sentence): result = nlp.dependency_parse(sentence) return result # 对某一列进行依存句法分析，并将结果保存到新的一列中 df['dependency_parse'] = df['text'].apply(lambda x: dependency_parse(" ".join(x))) # 将结果保存到输出文件中 df.to_csv(output_file, index=False) nlp.close()优化这段代码

import pandas as pd from nltk.corpus import stopwords from nltk.stem import SnowballStemmer from nltk.tokenize import RegexpTokenizer from stanfordcorenlp import StanfordCoreNLP # Define file paths ...

# 定义数据集路径 data_dir = '/path/to/dataset' def extract_features(file_path): # 读取音频文件 signal, sr = librosa.load(file_path, sr=22050) file_path = "D:/360se6/bishe/古筝/gz1.wav" # 提取MFCC特征 mfccs = librosa.feature.mfcc(signal, sr=sr, n_mfcc=13) mfccs = np.mean(mfccs.T, axis=0) return mfccs # 加载数据集 data = pd.read_csv(os.path.join(data_dir, 'data.csv')) 这段代码中如何加载数据集

这段代码中使用了 pandas 库中的 read_csv() 方法读取名为 'data.csv' 的 CSV 文件，并将其存储在名为 data 的 pandas DataFrame 中。其中 os.path.join() 方法用于连接文件路径，data_dir 是指数据集所在的文件夹...

def load_data(file_name): df = pd.read_csv('data/new_data/' + file_name, encoding='gbk') columns = df.columns df.fillna(df.mean(), inplace=True) return df class MyDataset(Dataset): def init(self, data): self.data = data def getitem(self, item): return self.data[item] def len(self): return len(self.data) def nn_seq_us(B): print('data processing...') dataset = load_data() # split train = dataset[:int(len(dataset) * 0.6)] val = dataset[int(len(dataset) * 0.6):int(len(dataset) * 0.8)] test = dataset[int(len(dataset) * 0.8):len(dataset)] m, n = np.max(train[train.columns[1]]), np.min(train[train.columns[1]]) def process(data, batch_size): load = data[data.columns[1]] load = load.tolist() data = data.values.tolist() load = (load - n) / (m - n) seq = [] for i in range(len(data) - 24): train_seq = [] train_label = [] for j in range(i, i + 24): x = [load[j]] train_seq.append(x) # for c in range(2, 8): # train_seq.append(data[i + 24][c]) train_label.append(load[i + 24]) train_seq = torch.FloatTensor(train_seq) train_label = torch.FloatTensor(train_label).view(-1) seq.append((train_seq, train_label)) # print(seq[-1]) seq = MyDataset(seq) seq = DataLoader(dataset=seq, batch_size=batch_size, shuffle=False, num_workers=0, drop_last=True) return seq Dtr = process(train, B) Val = process(val, B) Dte = process(test, B) return Dtr, Val, Dte, m, n分别解释一下每行代码都是什么意思

1. load_data(file_name) 函数用于读取指定文件名的 CSV 文件，并返回一个 Pandas DataFrame 对象。其中，文件路径是 "data/new_data/" 加上给定的文件名，编码格式为 gbk。 2. MyDataset 类是一个自定义的 ...

我需要将data保存成csvparser = argparse.ArgumentParser(description = 'Script for running the decompression') parser.add_argument('-d', '--dataset', nargs = '?', type = str, help = 'Dataset path', default = r'E:\23年4月\MDF2\len500\n=4\0.0455\CORAD-master\CORAD-master\results\compressed_data\20160930_203718-2.csv\originalData.out') args = parser.parse_args() with open(args.dataset, 'rb') as pickle_file: print(pickle_file) data = pickle.load(pickle_file) print(data)

import pandas as pd # 假设data是一个包含数据的列表或DataFrame data = [[1, 2, 3], [4, 5, 6], [7, 8, 9]] df = pd.DataFrame(data) # 将数据保存为CSV文件 output_path = r'/path/to/output/data.csv' df.to_...

from sklearn.preprocessing import MinMaxScaler scaler = MinMaxScaler() data_normalized = scaler.fit_transform(data)，将data_normalized保存为数据表

df_normalized = pd.DataFrame(data_normalized, columns=data.columns) # 假设data是Pandas DataFrame df_normalized.to_csv('normalized_data.csv', index=False) 2. **Excel文件**： python df_...

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