Python读写CSV、JSON与XML文件全指南及格式互转

import csv filename = "my_data.csv" fields = [] rows = [] # 读取csv文件 with open(filename, 'r') as csvfile: # 创建一个csv reader对象 csvreader = csv.reader(csvfile) # 从文件中第一行中读取属性名称信息 # fields = next(csvreader) python3.2 以上的版本使用 fields = csvreader.next() # 接着一行一行读取数据 for row in csvreader: rows.append(row) # 打印前5行信息 for row in rows[:5]: print(row)

import csv # 属性名称 fields = ['Name', 'Goals', 'Assists', 'Shots'] # csv文件中每一行的数据，一行为一个列表 rows = [ ['Emily', '12', '18', '112'], ['Katie', '8', '24', '96'], ['John', '16', '9', '101'], ['Mike', '3', '14', '82']] filename = "soccer.csv" # 将数据写入到csv文件中 with open(filename, 'w+') as csvfile: # 创建一个csv writer对象 csvwriter = csv.writer(csvfile) # 写入属性名称 csvwriter.writerow(fields) # 写入数据 csvwriter.writerows(rows)

import pandas as pd filename = "my_data.csv" # 读取csv文件数据 data = pd.read_csv(filename) # 打印前5行 print(data.head(5)) # 将数据写入到csv文件中 data.to_csv("new_data.csv", sep=",", index=False)

import pandas as pd from dicttoxml import dicttoxml import json # 创建一个DataFrame data = {'Name': ['Emily', 'Katie', 'John', 'Mike'], 'Goals': [12, 8, 16, 3], 'Assists': [18, 24, 9, 14], 'Shots': [112, 96, 101, 82] } df = pd.DataFrame(data, columns=data.keys()) # 将DataFrame转化为一个字典并且将它存储到json文件中 data_dict = df.to_dict(orient="records") with open('output.json', "w+") as f: json.dump(data_dict, f, indent=4) # 将DataFrame转化为一个字典并且将它存储到xml文件中 xml_data = dicttoxml(data_dict).decode() with open("output.xml", "w+") as f: f.write(xml_data)

import json import pandas as pd # 使用json模块从json文件中读取数据 # 以字典形式存储 with open('data.json') as f: data_listofdict = json.load(f) # 也可以直接使用pandas直接读取json文件 data_df = pd.read_json('data.json', orient='records') # 将字典数据保存为json文件 # 并使用 'indent' and 'sort_keys' 格式化json文件 with open('new_data.json', 'w+') as json_file: json.dump(data_listofdict, json_file, indent=4, sort_keys=True) # 也可以使用pandas将字典结构的数据保存为json文件 export = data_df.to_json('new_data.json', orient='records')

import json import pandas as pd import csv # 从json文件中读取数据 # 数据存储在一个字典列表中 with open('data.json') as f: data_listofdict = json.load(f) # 以列表中的字典写入倒csv文件中 keys = data_listofdict[0].keys() with open('saved_data.csv', 'w') as output_file: dict_writer = csv.DictWriter(output_file, keys) dict_writer.writeheader() dict_writer.writerows(data_listofdict)

import xml.etree.ElementTree as ET import xmltodict import json tree = ET.parse('output.xml') xml_data = tree.getroot() xmlstr = ET.tostring(xml_data, encoding='utf8', method='xml') data_dict = dict(xmltodict.parse(xmlstr)) print(data_dict) with open('new_data_2.json', 'w+') as json_file: json.dump(data_dict, json_file, indent=4, sort_keys=True)