python
import numpy as np
A = np.array([[1, 2], [3, 4]])
B = np.array([[5, 6], [7, 8]])
C = np.dot(A, B)
print(C)
python
import pandas as pd
data = pd.read_csv('data.csv')
mean_value = data['value'].mean()
max_value = data['value'].max()
min_value = data['value'].min()
python
import matplotlib.pyplot as plt
x = [1, 2, 3, 4, 5]
y = [2, 4, 6, 8, 10]
plt.plot(x, y)
plt.show()
python
import scrapy
class MySpider(scrapy.Spider):
name = 'example.com'
start_urls = [
'http://www.example.com/page1',
'http://www.example.com/page2',
]
def parse(self, response):
data = response.xpath('//div[@class="content"]/text()').extract()
for item in data:
yield {
'text': item,
}
scrapy runspider my_spider.py -o data.json
