Author Archives: Robins

When Python Django creates a database, can’t open file ‘ manage.py ‘: [Errno 2] No such file or directory

1. When creating a database after learning Diango new project, use the following command:

python manage.py migrate

‘can’t open file ‘manage.py’: [Errno 2] No such file or directory’ can’t open file ‘manage.py’: [Errno 2] No such file or directory ‘can’t open file ‘manage.py’: [Errno 2] No such file or directory’
Django-admin.py: django-admin.py: django-admin.py: django-admin.py: django-admin.py: django-admin.py: django-admin.py: django-admin.py: django-admin.py: django-admin.py: django-admin.py: django-admin.py: django-admin.py: django-admin.py: django-admin.py: django-admin.py:

 django-admin.py startproject student_project .

4, then report the above described error, the reason: in fact, the path is wrong, did not set the soft connection. F:\python_stu\student_project\stu_env\Lib\site-packages\ Django \bin. Django-admin.py: F:\python_stu\student_project\stu_env\Lib\site-packages\ Django \bin.

python F:\python_stu\student_project\stu_env\Lib\site-packages\django\bin\django-admin.py startproject student_project

The above content is only for your reference, thank you!

vscode: Error loading workspace: err: exit status 1: stderr: build flag -mod=readonly only valid

When writing Golang code in VS Code for Windows, the following error occurs:

Error loading workspace: err: exit status 1: stderr: build flag -mod=readonly only valid when using modules : packages.Load error

Solutions:
Enter the following on the command line:

go env -w GO111MODULE=on

This (code, message, data: null) still exists after importing spring cloud project into Lombok; the data in the project is unrecognized

Remember to import Lombok’s plugin in IDEA!!

[How to Fix] _this2.$xxxis not a function

Error: _this2. $xxxxxis not a function

 handleDelete: (api) => {
      this.$message("This is a message");
    },

Is amended as:

handleDelete: function () {
      this.$message("This is a message");
    },

JS error – typeerror: XXX is not a function

In today’s work, there is a check box for the onchage event binding function that clearly has been implemented. Typeerror: XXX is not a function Typeerror: XXX is not a function Uncaught ReferenceError: AA is not defined, but the error message is different. Carefully contrasting the two errors, “is not defined” means the type is not defined. Is not a function means that the type is not of function type. After searching Baidu, it is found that some browsers can directly find the changed element through the element ID in the JS code, and then rewrite the defined function by the element in the DOM, which will lead to the error is not a function.

solution:
modify the element ID value, or modify the name of the function.
Of course, not all errors of this type are caused by this reason, and it should be analyzed on a case-by-case basis.

The solution of this. $message is not a function

import { Message } from 'element-ui'
Vue.use(Message)
Vue.prototype.$message = Message

Python: How to Obtaining Publick IP Quickly

from urllib.request import urlopen

def get_ip(self):
  try:
    return str(urlopen('http://159.75.41.235/').read())   
  except:
    return False

print(get_ip())

Access to external network IP speed mainly depends on the server speed, this domestic than foreign those much faster
Return the sample

{"city_id":2140,"region":"China|0|Guangdong|Guangzhou|Guangdong Radio and Television","ip":"124.240.53.227"}

Git prompt this. $message is not a function?

Find the main.js component in the vue file and re-run it with the following code:

import ElementUI from 'element-ui'
Vue.use(ElementUI)

When setting up etcd cluster, an error is reported. Etcd: request cluster ID mismatch error resolution is only applicable to new etcd cluster or no data cluster

:
:
:

Cause: java.sql.SQLException: invalid column type: 1111 Error [How to Fix]

Warming: Servlet.service() for servlet [spring] in context with path [/*****] threw exception [Request processing failed; nested exception is org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.type.TypeException: Could not set parameters for mapping: ParameterMapping{property='ENTERPRISE_NAME', mode=IN, javaType=class java.lang.Object, jdbcType=null, numericScale=null, resultMapId='null', jdbcTypeName='null', expression='null'}. Cause: org.apache.ibatis.type.TypeException: Error setting null for parameter #13 with JdbcType OTHER . Try setting a different JdbcType for this parameter or a different jdbcTypeForNull configuration property. Cause: java.sql.SQLException: Invalid column type: 1111] with root cause
java.sql.SQLException: Invalid column type: 1111
	at oracle.jdbc.driver.OracleStatement.getInternalType(OracleStatement.java:3978)

Screen:

When inserting the name,ENTERPRISE_NAME passes null and mybatis returns an error.
The solution is:

Summary of Python deep learning packages

Python deep learning often uses package summaries
Update history

2021/2/28

1.pytorch
Website: https://pytorch.org/
Current installed version: 1.7.1

pip install torch===1.7.1+cu110 torchvision===0.8.2+cu110 torchaudio===0.7.2 -f https://download.pytorch.org/whl/torch_stable.html

2. scikit-learn(sklearn)

pip install scikit-learn

Current version: 0.24.1
3.pandas

pip install pandas

Current version: 1.2.2
Installing Pandas will install Numpy
4.numpy

pip install numpy

Current version: 1.20.1

Previous installers of PyTorch did not use the latest Numpy. 1.16.6 does.
But now the latest version does.

5.matplotlib

pip install matplotlib

Current version: 3.3.4
6 tensorflow 1.15

pip install tensorflow==1.15 -i http://pypi.douban.com/simple/

Less use of
1.networkx
NetworkX is a Python package for building and manipulating complex graph structures and providing algorithms for analyzing graphs.

pip install networkx

Current version: 2.5

Golang: How to Read File All Content in one time

package main

import (
	"fmt"
	"io/ioutil"
	"os"
)

func main() {
	content, err := ioutil.ReadFile("d:/fileOpen.txt") // Read all the contents of a file at once, which can affect performance when the file is large
	if err != nil {
		fmt.Println("read file err:", err)
		os.Exit(2)
	}
	fmt.Println(string(content))
}

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