原力计划


Python 最常用的 20 个包和代码示例(按照使用频率排序):

numpy(数据处理和科学计算)

代码示例:


arr = np.array([1, 2, 3, 4, 5])
print(arr)

pandas(数据处理和分析)

代码示例:


data = {'name': ['John', 'Bob', 'Alice'], 'age': [20, 35, 25]}
df = pd.DataFrame(data)
print(df)

matplotlib(数据可视化)

代码示例:

import matplotlib.pyplot as plt

x = [1, 2, 3, 4, 5]
y = [4, 2, 7, 5, 9]
plt.plot(x, y)
plt.show()

scikit-learn(机器学习工具)

代码示例:

from sklearn.linear_model import LinearRegression

X = [[1, 4], [2, 5], [3, 6]]
y = [8, 10, 12]
model = LinearRegression().fit(X, y)
print(model.predict([[4, 7]]))

tensorflow(深度学习框架)

代码示例:


import tensorflow as tf

x = tf.constant([1, 2, 3, 4])
y = tf.constant([5, 6, 7, 8])
z = tf.add(x, y)
sess = tf.Session()
print(sess.run(z))

keras(深度学习框架)

代码示例:


from keras.models import Sequential
from keras.layers import Dense

model = Sequential()
model.add(Dense(10, input_dim=5, activation='relu'))
model.add(Dense(1, activation='sigmoid'))
model.compile(loss='binary_crossentropy', optimizer='adam')

requests(HTTP 库)

代码示例:


import requests

response = requests.get('https://www.baidu.com')
print(response.text)

flask(Web 框架)

代码示例:


from flask import Flask, render_template

app = Flask(**name**)

@app.route('/')
def index():
return render_template('index.html')

if **name** == '**main**':
app.run(debug=True)

scrapy(网络爬虫框架)

代码示例:


import scrapy

class MySpider(scrapy.Spider):
name = 'myspider'
start_urls = ['http://quotes.toscrape.com']

    def parse(self, response):
        for quote in response.css('div.quote'):
            yield {'text': quote.css('span.text::text').get(),
                   'author': quote.css('span small::text').get()}

beautifulsoup(HTML 解析器)

代码示例:


from bs4 import BeautifulSoup

html = '<html><head><title>这是标题</title></head><body><p>这是一个段落。</p ></body></html>'
soup = BeautifulSoup(html, 'html.parser')
print(soup.title.text)

selenium(Web 自动化测试)

代码示例:


from selenium import webdriver

driver = webdriver.Chrome()
driver.get('https://www.baidu.com')
search_box = driver.find_element_by_name('wd')
search_box.send_keys('Python')
search_box.submit()

ctypes(调用 C 语言库)

代码示例:


import ctypes

lib = ctypes.cdll.LoadLibrary('libexample.so')
lib.add(1, 2)

wxPython(GUI 开发)

代码示例:

import wx

app = wx.App()
frame = wx.Frame(None, title='Hello, wxPython!')
frame.Show()
app.MainLoop()

pillow(图像处理)

代码示例:


from PIL import Image

im = Image.open('test.jpg')
im.show()

openpyxl(处理 Excel 文件)

代码示例:


import openpyxl

wb = openpyxl.load_workbook('example.xlsx')
sheet = wb['Sheet1']
cell = sheet['A1']
print(cell.value)

nltk(自然语言处理)

代码示例:
import nltk

sent = ‘This is a sentence.’
tokens = nltk.word_tokenize(sent)
print(tokens)

jieba(中文分词)

代码示例:

import jieba

text = '我爱中文分词'
words = jieba.cut(text)
for word in words:
print(word)

re(正则表达式)

代码示例:

import re

text = 'The quick brown fox jumps over the lazy dog.'
pattern = re.compile('fox')
print(pattern.findall(text))

datetime(日期时间处理)

代码示例:


import datetime

dt = datetime.datetime.now()
print(dt)

random(随机数生成)

代码示例:

import random
print(random.randint(1, 10))

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