{"id":1142185,"date":"2025-01-08T22:37:32","date_gmt":"2025-01-08T14:37:32","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1142185.html"},"modified":"2025-01-08T22:37:35","modified_gmt":"2025-01-08T14:37:35","slug":"python%e5%a6%82%e4%bd%95%e5%b0%86%e4%b8%80%e4%b8%aa%e5%ad%97%e6%ae%b5%e8%ae%be%e4%b8%ba%e9%94%ae","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1142185.html","title":{"rendered":"python\u5982\u4f55\u5c06\u4e00\u4e2a\u5b57\u6bb5\u8bbe\u4e3a\u952e"},"content":{"rendered":"

\"python\u5982\u4f55\u5c06\u4e00\u4e2a\u5b57\u6bb5\u8bbe\u4e3a\u952e\"<\/p>\n

PYTHON\u5982\u4f55\u5c06\u4e00\u4e2a\u5b57\u6bb5\u8bbe\u4e3a\u952e<\/h3>\n<\/p>\n

\u5728Python\u4e2d\u5c06\u4e00\u4e2a\u5b57\u6bb5\u8bbe\u4e3a\u952e\u6709\u591a\u79cd\u65b9\u6cd5\uff0c\u53ef\u4ee5\u4f7f\u7528\u5b57\u5178\u3001pandas<\/code>\u5e93\u3001collections<\/code>\u6a21\u5757\u7b49<\/strong>\u3002\u5176\u4e2d\uff0c\u4f7f\u7528\u5b57\u5178\u65b9\u6cd5\u662f\u6700\u76f4\u63a5\u7684\u65b9\u5f0f\u3002\u901a\u8fc7\u5c06\u6570\u636e\u7ed3\u6784\u8f6c\u6362\u4e3a\u5b57\u5178\uff0c\u5e76\u5c06\u6240\u9700\u5b57\u6bb5\u4f5c\u4e3a\u952e\uff0c\u53ef\u4ee5\u8f7b\u677e\u5b9e\u73b0\u8fd9\u4e00\u76ee\u6807\u3002\u4e0b\u9762\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u8fd9\u4e9b\u65b9\u6cd5\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u4f7f\u7528\u5b57\u5178\u5c06\u5b57\u6bb5\u8bbe\u4e3a\u952e<\/h4>\n<\/p>\n

\u5b57\u5178\u662fPython\u4e2d\u6700\u5e38\u7528\u7684\u6570\u636e\u7ed3\u6784\u4e4b\u4e00\uff0c\u975e\u5e38\u9002\u5408\u5c06\u67d0\u4e2a\u5b57\u6bb5\u8bbe\u4e3a\u952e\u3002\u5047\u8bbe\u6709\u4e00\u4e2a\u5217\u8868\uff0c\u5217\u8868\u4e2d\u6bcf\u4e2a\u5143\u7d20\u90fd\u662f\u5b57\u5178\uff0c\u60f3\u8981\u5c06\u67d0\u4e2a\u5b57\u6bb5\u8bbe\u4e3a\u952e\uff0c\u53ef\u4ee5\u901a\u8fc7\u5b57\u5178\u63a8\u5bfc\u5f0f\u6765\u5b9e\u73b0\u3002<\/p>\n<\/p>\n

data = [<\/p>\n
    {'id': 1, 'name': 'Alice', 'age': 25},<\/p>\n
    {'id': 2, 'name': 'Bob', 'age': 30},<\/p>\n
    {'id': 3, 'name': 'Charlie', 'age': 35}<\/p>\n
]<\/p>\n
\u5c06'id'\u5b57\u6bb5\u8bbe\u4e3a\u952e<\/strong><\/h2>\n
data_dict = {item['id']: item for item in data}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u6837\uff0cdata_dict<\/code>\u5c06\u4f1a\u662f\u4e00\u4e2a\u4ee5id<\/code>\u4e3a\u952e\u7684\u5b57\u5178\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u4f7f\u7528pandas\u5c06\u5b57\u6bb5\u8bbe\u4e3a\u952e<\/h4>\n<\/p>\n
pandas<\/code>\u662f\u4e00\u4e2a\u5f3a\u5927\u7684\u6570\u636e\u5206\u6790\u5e93\uff0c\u63d0\u4f9b\u4e86\u8bb8\u591a\u9ad8\u6548\u7684\u64cd\u4f5c\u6570\u636e\u7684\u65b9\u6cd5\u3002\u5728\u5904\u7406\u6570\u636e\u65f6\uff0c\u901a\u5e38\u4f1a\u4f7f\u7528pandas<\/code>\u7684DataFrame<\/code>\u7ed3\u6784\u3002\u5728DataFrame<\/code>\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u8bbe\u7f6e\u7d22\u5f15\u6765\u5c06\u67d0\u4e2a\u5b57\u6bb5\u8bbe\u4e3a\u952e\u3002<\/p>\n<\/p>\n
import pandas as pd<\/p>\n
\u521b\u5efa DataFrame<\/strong><\/h2>\n
df = pd.DataFrame(data)<\/p>\n
\u5c06'id'\u5b57\u6bb5\u8bbe\u4e3a\u7d22\u5f15<\/strong><\/h2>\n
df.set_index('id', inplace=True)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u6837\uff0cdf<\/code>\u7684\u7d22\u5f15\u5c06\u53d8\u4e3aid<\/code>\u5b57\u6bb5\uff0c\u8fdb\u4e00\u6b65\u64cd\u4f5c\u5c06\u66f4\u52a0\u65b9\u4fbf\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u4f7f\u7528collections\u6a21\u5757\u7684defaultdict<\/h4>\n<\/p>\n
collections<\/code>\u6a21\u5757\u63d0\u4f9b\u4e86\u8bb8\u591a\u6709\u7528\u7684\u6570\u636e\u7ed3\u6784\uff0c\u5176\u4e2d\u7684defaultdict<\/code>\u53ef\u4ee5\u7b80\u5316\u5b57\u5178\u7684\u64cd\u4f5c\u3002\u5728\u5c06\u5b57\u6bb5\u8bbe\u4e3a\u952e\u65f6\uff0c\u53ef\u4ee5\u5229\u7528defaultdict<\/code>\u81ea\u52a8\u521d\u59cb\u5316\u5b57\u5178\u7684\u503c\u3002<\/p>\n<\/p>\n
from collections import defaultdict<\/p>\n
data_dict = defaultdict(list)<\/p>\n
for item in data:<\/p>\n
    data_dict[item['id']].append(item)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u6837\uff0cdata_dict<\/code>\u5c06\u4f1a\u662f\u4e00\u4e2a\u4ee5id<\/code>\u4e3a\u952e\u7684\u5b57\u5178\uff0c\u5e76\u4e14\u6bcf\u4e2a\u952e\u5bf9\u5e94\u7684\u503c\u662f\u4e00\u4e2a\u5217\u8868\u3002<\/p>\n<\/p>\n
\u56db\u3001\u4f7f\u7528SQLAlchemy ORM\u7684\u6a21\u578b\u5bf9\u8c61<\/h4>\n<\/p>\n
\u5bf9\u4e8e\u66f4\u52a0\u590d\u6742\u7684\u6570\u636e\u64cd\u4f5c\u548c\u7ba1\u7406\uff0c\u53ef\u4ee5\u4f7f\u7528SQLAlchemy ORM\uff08\u5bf9\u8c61\u5173\u7cfb\u6620\u5c04\uff09\u5c06\u5b57\u6bb5\u8bbe\u4e3a\u952e\u3002\u5728SQLAlchemy\u4e2d\uff0c\u53ef\u4ee5\u5b9a\u4e49\u6a21\u578b\u7c7b\uff0c\u5e76\u901a\u8fc7\u914d\u7f6e\u6620\u5c04\u5b57\u6bb5\u6765\u5b9e\u73b0\u8fd9\u4e00\u76ee\u6807\u3002<\/p>\n<\/p>\n
from sqlalchemy import create_engine, Column, Integer, String<\/p>\n
from sqlalchemy.ext.declarative import declarative_base<\/p>\n
from sqlalchemy.orm import sessionmaker<\/p>\n
\u5b9a\u4e49\u6a21\u578b\u7c7b<\/strong><\/h2>\n
Base = declarative_base()<\/p>\n
class User(Base):<\/p>\n
    __tablename__ = 'users'<\/p>\n
    id = Column(Integer, primary_key=True)<\/p>\n
    name = Column(String)<\/p>\n
    age = Column(Integer)<\/p>\n
\u521b\u5efa\u6570\u636e\u5e93\u8fde\u63a5\u548c\u4f1a\u8bdd<\/strong><\/h2>\n
engine = create_engine('sqlite:\/\/\/:memory:')<\/p>\n
Base.metadata.create_all(engine)<\/p>\n
Session = sessionmaker(bind=engine)<\/p>\n
session = Session()<\/p>\n
\u63d2\u5165\u6570\u636e<\/strong><\/h2>\n
session.add_all([<\/p>\n
    User(id=1, name='Alice', age=25),<\/p>\n
    User(id=2, name='Bob', age=30),<\/p>\n
    User(id=3, name='Charlie', age=35)<\/p>\n
])<\/p>\n
session.commit()<\/p>\n
\u67e5\u8be2\u6570\u636e\u5e76\u5c06'id'\u5b57\u6bb5\u8bbe\u4e3a\u952e<\/strong><\/h2>\n
users = session.query(User).all()<\/p>\n
user_dict = {user.id: user for user in users}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u6837\uff0cuser_dict<\/code>\u5c06\u4f1a\u662f\u4e00\u4e2a\u4ee5id<\/code>\u4e3a\u952e\u7684\u5b57\u5178\uff0c\u6bcf\u4e2a\u952e\u5bf9\u5e94\u7684\u503c\u662f\u4e00\u4e2aUser<\/code>\u5bf9\u8c61\u3002<\/p>\n<\/p>\n
\u4e94\u3001\u4f7f\u7528JSON\u6570\u636e\u89e3\u6790<\/h4>\n<\/p>\n
\u5728\u5904\u7406JSON\u6570\u636e\u65f6\uff0c\u4e5f\u53ef\u4ee5\u901a\u8fc7\u89e3\u6790JSON\u5e76\u5c06\u67d0\u4e2a\u5b57\u6bb5\u8bbe\u4e3a\u952e\u3002\u5047\u8bbe\u6709\u4e00\u4e2aJSON\u6587\u4ef6\uff0c\u5185\u5bb9\u4e0e\u4e0a\u8ff0\u6570\u636e\u7c7b\u4f3c\uff0c\u53ef\u4ee5\u4f7f\u7528json<\/code>\u5e93\u6765\u89e3\u6790\u5e76\u8f6c\u6362\u4e3a\u5b57\u5178\u3002<\/p>\n<\/p>\n
import json<\/p>\n
\u8bfb\u53d6JSON\u6587\u4ef6<\/strong><\/h2>\n
with open('data.json', 'r') as file:<\/p>\n
    data = json.load(file)<\/p>\n
\u5c06'id'\u5b57\u6bb5\u8bbe\u4e3a\u952e<\/strong><\/h2>\n
data_dict = {item['id']: item for item in data}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u6837\uff0cdata_dict<\/code>\u5c06\u4f1a\u662f\u4e00\u4e2a\u4ee5id<\/code>\u4e3a\u952e\u7684\u5b57\u5178\u3002<\/p>\n<\/p>\n
\u516d\u3001\u4f7f\u7528\u81ea\u5b9a\u4e49\u51fd\u6570<\/h4>\n<\/p>\n
\u6709\u65f6\uff0c\u53ef\u80fd\u9700\u8981\u66f4\u52a0\u7075\u6d3b\u7684\u65b9\u5f0f\u6765\u5904\u7406\u6570\u636e\uff0c\u53ef\u4ee5\u7f16\u5199\u81ea\u5b9a\u4e49\u51fd\u6570\u6765\u5c06\u67d0\u4e2a\u5b57\u6bb5\u8bbe\u4e3a\u952e\u3002\u8fd9\u79cd\u65b9\u6cd5\u9002\u7528\u4e8e\u66f4\u590d\u6742\u7684\u573a\u666f\u3002<\/p>\n<\/p>\n
def set_field_as_key(data, key_field):<\/p>\n
    return {item[key_field]: item for item in data}<\/p>\n
\u4f7f\u7528\u81ea\u5b9a\u4e49\u51fd\u6570<\/strong><\/h2>\n
data_dict = set_field_as_key(data, 'id')<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u6837\uff0c\u901a\u8fc7\u8c03\u7528set_field_as_key<\/code>\u51fd\u6570\uff0c\u53ef\u4ee5\u5c06\u4efb\u610f\u5b57\u6bb5\u8bbe\u4e3a\u952e\u3002<\/p>\n<\/p>\n
\u4e03\u3001\u4f7f\u7528\u5217\u8868\u7406\u89e3\u548c\u751f\u6210\u5668<\/h4>\n<\/p>\n
\u5728\u5904\u7406\u5927\u6570\u636e\u96c6\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528\u751f\u6210\u5668\u8868\u8fbe\u5f0f\u6765\u8282\u7701\u5185\u5b58\u3002\u751f\u6210\u5668\u8868\u8fbe\u5f0f\u548c\u5217\u8868\u63a8\u5bfc\u5f0f\u7c7b\u4f3c\uff0c\u4f46\u5b83\u4e0d\u4f1a\u7acb\u5373\u751f\u6210\u6574\u4e2a\u5217\u8868\uff0c\u800c\u662f\u6309\u9700\u751f\u6210\u5143\u7d20\u3002<\/p>\n<\/p>\n
data_gen = ({item['id']: item} for item in data)<\/p>\n
\u5c06\u751f\u6210\u5668\u8f6c\u6362\u4e3a\u5b57\u5178<\/strong><\/h2>\n
data_dict = {k: v for d in data_gen for k, v in d.items()}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u6837\uff0cdata_dict<\/code>\u5c06\u4f1a\u662f\u4e00\u4e2a\u4ee5id<\/code>\u4e3a\u952e\u7684\u5b57\u5178\uff0c\u5e76\u4e14\u5728\u751f\u6210\u8fc7\u7a0b\u4e2d\u66f4\u8282\u7701\u5185\u5b58\u3002<\/p>\n<\/p>\n
\u516b\u3001\u4f7f\u7528MapReduce\u65b9\u6cd5<\/h4>\n<\/p>\n
\u5bf9\u4e8e\u5206\u5e03\u5f0f\u8ba1\u7b97\u548c\u5927\u6570\u636e\u5904\u7406\uff0c\u53ef\u4ee5\u4f7f\u7528MapReduce\u65b9\u6cd5\u6765\u5c06\u5b57\u6bb5\u8bbe\u4e3a\u952e\u3002MapReduce\u662f\u4e00\u4e2a\u7f16\u7a0b\u6a21\u578b\uff0c\u9002\u7528\u4e8e\u5904\u7406\u5927\u89c4\u6a21\u6570\u636e\u96c6\u3002<\/p>\n<\/p>\n
def map_function(item):<\/p>\n
    return (item['id'], item)<\/p>\n
def reduce_function(mapped_data):<\/p>\n
    result = {}<\/p>\n
    for key, value in mapped_data:<\/p>\n
        result[key] = value<\/p>\n
    return result<\/p>\n
\u4f7f\u7528MapReduce\u65b9\u6cd5<\/strong><\/h2>\n
mapped_data = map(map_function, data)<\/p>\n
data_dict = reduce_function(mapped_data)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u6837\uff0cdata_dict<\/code>\u5c06\u4f1a\u662f\u4e00\u4e2a\u4ee5id<\/code>\u4e3a\u952e\u7684\u5b57\u5178\uff0c\u901a\u8fc7MapReduce\u65b9\u6cd5\u5b9e\u73b0\u3002<\/p>\n<\/p>\n
\u4e5d\u3001\u4f7f\u7528NumPy\u548c\u7ed3\u6784\u5316\u6570\u7ec4<\/h4>\n<\/p>\n
\u5728\u79d1\u5b66\u8ba1\u7b97\u4e2d\uff0cNumPy<\/code>\u5e93\u63d0\u4f9b\u4e86\u9ad8\u6548\u7684\u6570\u636e\u5904\u7406\u65b9\u6cd5\u3002\u53ef\u4ee5\u4f7f\u7528\u7ed3\u6784\u5316\u6570\u7ec4\u6765\u5c06\u5b57\u6bb5\u8bbe\u4e3a\u952e\u3002<\/p>\n<\/p>\n
import numpy as np<\/p>\n
\u521b\u5efa\u7ed3\u6784\u5316\u6570\u7ec4<\/strong><\/h2>\n
dtype = [('id', int), ('name', 'U10'), ('age', int)]<\/p>\n
data_array = np.array([(1, 'Alice', 25), (2, 'Bob', 30), (3, 'Charlie', 35)], dtype=dtype)<\/p>\n
\u5c06'id'\u5b57\u6bb5\u8bbe\u4e3a\u952e<\/strong><\/h2>\n
data_dict = {item['id']: item for item in data_array}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u6837\uff0cdata_dict<\/code>\u5c06\u4f1a\u662f\u4e00\u4e2a\u4ee5id<\/code>\u4e3a\u952e\u7684\u5b57\u5178\uff0c\u4f7f\u7528\u7ed3\u6784\u5316\u6570\u7ec4\u5b9e\u73b0\u3002<\/p>\n<\/p>\n
\u5341\u3001\u4f7f\u7528\u5d4c\u5957\u5b57\u5178\u548c\u591a\u7ea7\u7d22\u5f15<\/h4>\n<\/p>\n
\u5728\u5904\u7406\u590d\u6742\u6570\u636e\u7ed3\u6784\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528\u5d4c\u5957\u5b57\u5178\u548c\u591a\u7ea7\u7d22\u5f15\u6765\u5c06\u5b57\u6bb5\u8bbe\u4e3a\u952e\u3002\u8fd9\u79cd\u65b9\u6cd5\u9002\u7528\u4e8e\u9700\u8981\u591a\u4e2a\u5b57\u6bb5\u4f5c\u4e3a\u952e\u7684\u573a\u666f\u3002<\/p>\n<\/p>\n
nested_data = [<\/p>\n
    {'country': 'USA', 'city': 'New York', 'population': 8000000},<\/p>\n
    {'country': 'USA', 'city': 'Los Angeles', 'population': 4000000},<\/p>\n
    {'country': 'Canada', 'city': 'Toronto', 'population': 3000000}<\/p>\n
]<\/p>\n
\u5c06'country'\u548c'city'\u5b57\u6bb5\u8bbe\u4e3a\u952e<\/strong><\/h2>\n
nested_dict = {}<\/p>\n
for item in nested_data:<\/p>\n
    country = item['country']<\/p>\n
    city = item['city']<\/p>\n
    if country not in nested_dict:<\/p>\n
        nested_dict[country] = {}<\/p>\n
    nested_dict[country][city] = item<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u6837\uff0cnested_dict<\/code>\u5c06\u4f1a\u662f\u4e00\u4e2a\u4ee5country<\/code>\u548ccity<\/code>\u4e3a\u952e\u7684\u5d4c\u5957\u5b57\u5178\u3002<\/p>\n<\/p>\n
\u7ed3\u8bba<\/h3>\n<\/p>\n
\u5728Python\u4e2d\uff0c\u5c06\u4e00\u4e2a\u5b57\u6bb5\u8bbe\u4e3a\u952e\u7684\u65b9\u6cd5\u6709\u5f88\u591a\uff0c\u53ef\u4ee5\u6839\u636e\u5177\u4f53\u9700\u6c42\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\u3002\u4f7f\u7528\u5b57\u5178\u662f\u6700\u76f4\u63a5\u548c\u5e38\u89c1\u7684\u65b9\u6cd5<\/strong>\uff0c\u800cpandas\u5e93\u63d0\u4f9b\u4e86\u5f3a\u5927\u7684\u6570\u636e\u5904\u7406\u80fd\u529b<\/strong>\uff0c\u9002\u7528\u4e8e\u5927\u89c4\u6a21\u6570\u636e\u5206\u6790\u3002collections\u6a21\u5757\u7684defaultdict\u7b80\u5316\u4e86\u5b57\u5178\u64cd\u4f5c<\/strong>\uff0c\u800cSQLAlchemy ORM\u9002\u7528\u4e8e\u590d\u6742\u7684\u6570\u636e\u7ba1\u7406<\/strong>\u3002\u901a\u8fc7\u5408\u7406\u9009\u62e9\u548c\u7ec4\u5408\u8fd9\u4e9b\u65b9\u6cd5\uff0c\u53ef\u4ee5\u9ad8\u6548\u5730\u5c06\u5b57\u6bb5\u8bbe\u4e3a\u952e\uff0c\u5b9e\u73b0\u6570\u636e\u7684\u5feb\u901f\u67e5\u8be2\u548c\u7ba1\u7406\u3002<\/p>\n<\/p>\n
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