pip install pymysql sqlalchemy

import os
import pandas as pd
from sqlalchemy import create_engine

## 创建一个mysql连接器，用户名为root，密码为root123
## 地址为127.0.0.1，数据库名称为testdb，编码为utf-8
engine = create_engine(
    'mysql+pymysql://root:root123@127.0.0.1:3...

import numpy as np

# 1题 
arr1 = np.arange(9).reshape(3,3)

arr1.max(axis=1) # 对于二维数组来说，axis=0 对列操作，axis=1 对行操作

array([2, 5, 8])

# 2题
arr2 = np.arange(36).reshape(2,3,6)
arr2

array([[[ 0,  1,  2,  3,  4,  5],
        [ 6,  7,  8,  9, 10, 11],
        [12, 13, 14, 15, 16, 17]],

     ...

import tushare as ts
import pandas as pd
from pandas import DataFrame,Series
import numpy as np

import numpy as np

# 1.创建一个长度为10的ndarry对象，然后让第三个元素等于1

arr1 = np.zeros(10)
arr1[2] = 1
print(arr1)

# 2.创建10到49的ndarry对象

arr2 = np.arange(10, 50)
print(arr2)

# 3.反转arr2

arr3 = arr2[::-1]
print(arr3)

# 4.使用np.random.random

arr4 = np.random.random((10, 10))
print(arr4)
print(arr4.min())

# 5...

package main

import (
    "encoding/json"
    "fmt"
)

// 结构体成员首字母大写才能被序列化，`json:字段` 表示在json中显示的字段
type person struct {
    Name string `json:"name"`
    Age  int    `json:"age"`
}

func main() {
    p1 := person{
        Name: "John",
        Ag...

package main

import "fmt"

var (
    allStudent map[int64]*student
)

type student struct {
    id   int64
    name string
}

func newStudent(id int64, name string) *student {
    return &student{
        id:   id,
        name: name,
    }
}

func showAllStudent() {
    for...

# 矩阵操作
import numpy as np

# 1.创建numpy矩阵
'''
np.mat("1 2 3;4 5 6;7 8 9")
np.matrix([[1,2,3],[4,5,6],[7,8,9]])
np.bmat("arr1 arr2;arr1 arr2")
'''

mat1 = np.mat("1 2 3;4 5 6;7 8 9")
print(mat1)
print(type(mat1))

mat2 = np.matrix([[1, 2, 3], [4...

# 安装开发工具组
yum groupinstall "Development tools"
# 安装其他依赖
yum install -y  zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gdbm-devel  xz xz-devel  libtiff-deve...