How to Install Tensorflow With Cuda in GPU Windows

How to Install Tensorflow With Cuda in GPU Windows with Git Bash

- install Anaconda and Git Bash

- create environment with python 3.10.13

- Setup Conda in Git Bash

dell@AHMADROIHAN-DELL MINGW64 /e/Program-Files/anaconda3/etc/profile.d
$ echo ". ${PWD}/conda.sh" >> ~/.bashrc
dell@AHMADROIHAN-DELL MINGW64 /e/Program-Files/anaconda3/etc/profile.d
$ echo ". '${PWD}'/conda.sh" >> ~/.bashrc

- Set up Git Bash to always run as Administrator

- Click the Windows Start button and type bash.

- Right-click the found link and select Open file location.

- Right-click the menu shortcut and select Properties.

- On the Compatibility tab select Run this program as administrator.

- Reopen Git Bash in other project directory and activate environment 

dell@AHMADROIHAN-DELL MINGW64 /f/PYTHON/gpu
$ conda activate p31013
(p31013)
dell@AHMADROIHAN-DELL MINGW64 /f/PYTHON/gpu
$ conda install -c conda-forge cudatoolkit cudnn

.................

dell@AHMADROIHAN-DELL MINGW64 /f/PYTHON/gpu

$ pip install "tensorflow<2.11"

.................

dell@AHMADROIHAN-DELL MINGW64 /f/PYTHON/gpu
$ python -c "import tensorflow as tf; print(tf.reduce_sum(tf.random.normal([1000, 1000])))"
2023-12-28 06:46:05.405858: I tensorflow/core/platform/cpu_feature_guard.cc:193] This TensorFlow binary is optimized with oneAPI Deep Neural Network Library (oneDNN) to use the following CPU instructions in performance-critical operations:  AVX AVX2
To enable them in other operations, rebuild TensorFlow with the appropriate compiler flags.
2023-12-28 06:46:07.065071: I tensorflow/core/common_runtime/gpu/gpu_device.cc:1616] Created device /job:localhost/replica:0/task:0/device:GPU:0 with 1654 MB memory:  -> device: 0, name: NVIDIA GeForce RTX 3050 Laptop GPU, pci bus id: 0000:01:00.0, compute capability: 8.6
tf.Tensor(1.7581177, shape=(), dtype=float32)
(p31013)
dell@AHMADROIHAN-DELL MINGW64 /f/PYTHON/gpu
$ python -c "import tensorflow as tf; print(tf.config.list_physical_devices('GPU'))"
[PhysicalDevice(name='/physical_device:GPU:0', device_type='GPU')]

How to Install Torch With Cuda in GPU Windows

How to install Torch With Cuda in GPU Windows

To know previous version of pytorch = https://pytorch.org/get-started/previous-versions/ 

(jupyter) F:\PYTHON\jupyter>pip install torch==2.1.1 torchvision==0.16.1 torchaudio==2.1.1 --index-url https://download.pytorch.org/whl/cu121

Looking in indexes: https://download.pytorch.org/whl/cu121

Collecting torch==2.1.1

  Downloading https://download.pytorch.org/whl/cu121/torch-2.1.1%2Bcu121-cp311-cp311-win_amd64.whl (2473.9 MB)

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Collecting torchvision==0.16.1

  Downloading https://download.pytorch.org/whl/cu121/torchvision-0.16.1%2Bcu121-cp311-cp311-win_amd64.whl (5.6 MB)

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Collecting torchaudio==2.1.1

  Downloading https://download.pytorch.org/whl/cu121/torchaudio-2.1.1%2Bcu121-cp311-cp311-win_amd64.whl (4.0 MB)

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Requirement already satisfied: filelock in f:\python\jupyter\lib\site-packages (from torch==2.1.1) (3.13.1)

Requirement already satisfied: typing-extensions in f:\python\jupyter\lib\site-packages (from torch==2.1.1) (4.5.0)

Requirement already satisfied: sympy in f:\python\jupyter\lib\site-packages (from torch==2.1.1) (1.12)

Requirement already satisfied: networkx in f:\python\jupyter\lib\site-packages (from torch==2.1.1) (3.2.1)

Requirement already satisfied: jinja2 in f:\python\jupyter\lib\site-packages (from torch==2.1.1) (3.1.2)

Requirement already satisfied: fsspec in f:\python\jupyter\lib\site-packages (from torch==2.1.1) (2023.12.2)

Requirement already satisfied: numpy in f:\python\jupyter\lib\site-packages (from torchvision==0.16.1) (1.23.5)

Requirement already satisfied: requests in f:\python\jupyter\lib\site-packages (from torchvision==0.16.1) (2.31.0)

Requirement already satisfied: pillow!=8.3.*,>=5.3.0 in f:\python\jupyter\lib\site-packages (from torchvision==0.16.1) (10.1.0)

Requirement already satisfied: MarkupSafe>=2.0 in f:\python\jupyter\lib\site-packages (from jinja2->torch==2.1.1) (2.1.3)

Requirement already satisfied: charset-normalizer<4,>=2 in f:\python\jupyter\lib\site-packages (from requests->torchvision==0.16.1) (3.3.2)

Requirement already satisfied: idna<4,>=2.5 in f:\python\jupyter\lib\site-packages (from requests->torchvision==0.16.1) (3.6)

Requirement already satisfied: urllib3<3,>=1.21.1 in f:\python\jupyter\lib\site-packages (from requests->torchvision==0.16.1) (2.1.0)

Requirement already satisfied: certifi>=2017.4.17 in f:\python\jupyter\lib\site-packages (from requests->torchvision==0.16.1) (2023.11.17)

Requirement already satisfied: mpmath>=0.19 in f:\python\jupyter\lib\site-packages (from sympy->torch==2.1.1) (1.3.0)

Installing collected packages: torch, torchvision, torchaudio

  Attempting uninstall: torch

    Found existing installation: torch 2.1.2

    Uninstalling torch-2.1.2:

      Successfully uninstalled torch-2.1.2

Successfully installed torch-2.1.1+cu121 torchaudio-2.1.1+cu121 torchvision-0.16.1+cu121

(jupyter) F:\PYTHON\jupyter>python -c "import torch; print(torch.rand(2,3).cuda())"

tensor([[0.2774, 0.4768, 0.9545],

        [0.7738, 0.6247, 0.4539]], device='cuda:0')

(jupyter) F:\PYTHON\jupyter>python -c "import torch; print(torch.cuda.device_count())"

1

How to Install Jupyter Notebook on Windows 11 2024

How to Install Jupyter Notebook on Windows 11 2024

Microsoft Windows [Version 10.0.22621.2861]
(c) Microsoft Corporation. All rights reserved.
C:\Users\dell>F:
F:\>cd PYTHON/jupyter
F:\PYTHON\jupyter>python --version
Python 3.11.3
F:\PYTHON\jupyter>python -m venv ./
F:\PYTHON\jupyter>F:\PYTHON\jupyter\Scripts\activate.bat
(jupyter) F:\PYTHON\jupyter>python -m pip install --upgrade pip
Requirement already satisfied: pip in f:\python\jupyter\lib\site-packages (22.3.1)
Collecting pip
  Downloading pip-23.3.2-py3-none-any.whl (2.1 MB)
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Installing collected packages: pip
  Attempting uninstall: pip
    Found existing installation: pip 22.3.1
    Uninstalling pip-22.3.1:
      Successfully uninstalled pip-22.3.1
Successfully installed pip-23.3.2
(jupyter) F:\PYTHON\jupyter>pip install jupyter
Collecting jupyter
  Downloading jupyter-1.0.0-py2.py3-none-any.whl (2.7 kB)
Collecting notebook (from jupyter)
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Installing collected packages: webencodings, wcwidth, types-python-dateutil, pywin32, pure-eval, json5, fastjsonschema, widgetsnbextension, websocket-client, webcolors, urllib3, uri-template, traitlets, tornado, tinycss2, soupsieve, sniffio, six, send2trash, rpds-py, rfc3986-validator, pyzmq, pyyaml, pywinpty, python-json-logger, pygments, pycparser, psutil, prompt-toolkit, prometheus-client, platformdirs, parso, pandocfilters, packaging, overrides, nest-asyncio, mistune, markupsafe, jupyterlab-widgets, jupyterlab-pygments, jsonpointer, idna, fqdn, executing, defusedxml, decorator, debugpy, colorama, charset-normalizer, certifi, babel, attrs, async-lru, terminado, rfc3339-validator, requests, referencing, qtpy, python-dateutil, matplotlib-inline, jupyter-core, jinja2, jedi, comm, cffi, bleach, beautifulsoup4, asttokens, anyio, stack-data, jupyter-server-terminals, jupyter-client, jsonschema-specifications, arrow, argon2-cffi-bindings, jsonschema, isoduration, ipython, argon2-cffi, nbformat, ipywidgets, ipykernel, qtconsole, nbclient, jupyter-events, jupyter-console, nbconvert, jupyter-server, notebook-shim, jupyterlab-server, jupyter-lsp, jupyterlab, notebook, jupyter
Successfully installed anyio-4.2.0 argon2-cffi-23.1.0 argon2-cffi-bindings-21.2.0 arrow-1.3.0 asttokens-2.4.1 async-lru-2.0.4 attrs-23.1.0 babel-2.14.0 beautifulsoup4-4.12.2 bleach-6.1.0 certifi-2023.11.17 cffi-1.16.0 charset-normalizer-3.3.2 colorama-0.4.6 comm-0.2.0 debugpy-1.8.0 decorator-5.1.1 defusedxml-0.7.1 executing-2.0.1 fastjsonschema-2.19.0 fqdn-1.5.1 idna-3.6 ipykernel-6.27.1 ipython-8.19.0 ipywidgets-8.1.1 isoduration-20.11.0 jedi-0.19.1 jinja2-3.1.2 json5-0.9.14 jsonpointer-2.4 jsonschema-4.20.0 jsonschema-specifications-2023.11.2 jupyter-1.0.0 jupyter-client-8.6.0 jupyter-console-6.6.3 jupyter-core-5.5.1 jupyter-events-0.9.0 jupyter-lsp-2.2.1 jupyter-server-2.12.1 jupyter-server-terminals-0.5.0 jupyterlab-4.0.9 jupyterlab-pygments-0.3.0 jupyterlab-server-2.25.2 jupyterlab-widgets-3.0.9 markupsafe-2.1.3 matplotlib-inline-0.1.6 mistune-3.0.2 nbclient-0.9.0 nbconvert-7.13.1 nbformat-5.9.2 nest-asyncio-1.5.8 notebook-7.0.6 notebook-shim-0.2.3 overrides-7.4.0 packaging-23.2 pandocfilters-1.5.0 parso-0.8.3 platformdirs-4.1.0 prometheus-client-0.19.0 prompt-toolkit-3.0.43 psutil-5.9.7 pure-eval-0.2.2 pycparser-2.21 pygments-2.17.2 python-dateutil-2.8.2 python-json-logger-2.0.7 pywin32-306 pywinpty-2.0.12 pyyaml-6.0.1 pyzmq-25.1.2 qtconsole-5.5.1 qtpy-2.4.1 referencing-0.32.0 requests-2.31.0 rfc3339-validator-0.1.4 rfc3986-validator-0.1.1 rpds-py-0.15.2 send2trash-1.8.2 six-1.16.0 sniffio-1.3.0 soupsieve-2.5 stack-data-0.6.3 terminado-0.18.0 tinycss2-1.2.1 tornado-6.4 traitlets-5.14.0 types-python-dateutil-2.8.19.14 uri-template-1.3.0 urllib3-2.1.0 wcwidth-0.2.12 webcolors-1.13 webencodings-0.5.1 websocket-client-1.7.0 widgetsnbextension-4.0.9
(jupyter) F:\PYTHON\jupyter>jupyter notebook
[I 2023-12-24 05:39:29.958 ServerApp] Extension package jupyter_lsp took 0.2852s to import
[W 2023-12-24 05:39:29.958 ServerApp] A `_jupyter_server_extension_points` function was not found in jupyter_lsp. Instead, a `_jupyter_server_extension_paths` function was found and will be used for now. This function name will be deprecated in future releases of Jupyter Server.
[I 2023-12-24 05:39:30.177 ServerApp] Extension package jupyter_server_terminals took 0.2166s to import
[W 2023-12-24 05:39:30.628 ServerApp] A `_jupyter_server_extension_points` function was not found in notebook_shim. Instead, a `_jupyter_server_extension_paths` function was found and will be used for now. This function name will be deprecated in future releases of Jupyter Server.
[I 2023-12-24 05:39:30.628 ServerApp] jupyter_lsp | extension was successfully linked.
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[I 2023-12-24 05:39:30.689 ServerApp] notebook | extension was successfully linked.
[I 2023-12-24 05:39:30.702 ServerApp] Writing Jupyter server cookie secret to C:\Users\dell\AppData\Roaming\jupyter\runtime\jupyter_cookie_secret
[I 2023-12-24 05:39:31.706 ServerApp] notebook_shim | extension was successfully linked.
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[I 2023-12-24 05:39:31.780 ServerApp] jupyter_lsp | extension was successfully loaded.
[I 2023-12-24 05:39:31.784 ServerApp] jupyter_server_terminals | extension was successfully loaded.
[I 2023-12-24 05:39:31.788 LabApp] JupyterLab extension loaded from F:\PYTHON\jupyter\Lib\site-packages\jupyterlab
[I 2023-12-24 05:39:31.788 LabApp] JupyterLab application directory is F:\PYTHON\jupyter\share\jupyter\lab
[I 2023-12-24 05:39:31.792 LabApp] Extension Manager is 'pypi'.
[I 2023-12-24 05:39:31.797 ServerApp] jupyterlab | extension was successfully loaded.
[I 2023-12-24 05:39:31.808 ServerApp] notebook | extension was successfully loaded.
[I 2023-12-24 05:39:31.812 ServerApp] Serving notebooks from local directory: F:\PYTHON\jupyter
[I 2023-12-24 05:39:31.812 ServerApp] Jupyter Server 2.12.1 is running at:
[I 2023-12-24 05:39:31.812 ServerApp] http://localhost:8888/tree?token=f3937ea4392f0bb833dea086303f57fc1551a9ae645c02a8
[I 2023-12-24 05:39:31.812 ServerApp]     http://127.0.0.1:8888/tree?token=f3937ea4392f0bb833dea086303f57fc1551a9ae645c02a8
[I 2023-12-24 05:39:31.812 ServerApp] Use Control-C to stop this server and shut down all kernels (twice to skip confirmation).
[C 2023-12-24 05:39:31.962 ServerApp]
    To access the server, open this file in a browser:
        file:///C:/Users/dell/AppData/Roaming/jupyter/runtime/jpserver-17016-open.html
    Or copy and paste one of these URLs:
        http://localhost:8888/tree?token=f3937ea4392f0bb833dea086303f57fc1551a9ae645c02a8
        http://127.0.0.1:8888/tree?token=f3937ea4392f0bb833dea086303f57fc1551a9ae645c02a8
[I 2023-12-24 05:39:32.045 ServerApp] Skipped non-installed server(s): bash-language-server, dockerfile-language-server-nodejs, javascript-typescript-langserver, jedi-language-server, julia-language-server, pyright, python-language-server, python-lsp-server, r-languageserver, sql-language-server, texlab, typescript-language-server, unified-language-server, vscode-css-languageserver-bin, vscode-html-languageserver-bin, vscode-json-languageserver-bin, yaml-language-server
0.00s - Debugger warning: It seems that frozen modules are being used, which may
0.00s - make the debugger miss breakpoints. Please pass -Xfrozen_modules=off
0.00s - to python to disable frozen modules.
0.00s - Note: Debugging will proceed. Set PYDEVD_DISABLE_FILE_VALIDATION=1 to disable this validation.
[I 2023-12-24 05:40:22.529 ServerApp] Creating new notebook in
[I 2023-12-24 05:40:22.670 ServerApp] Writing notebook-signing key to C:\Users\dell\AppData\Roaming\jupyter\notebook_secret
[I 2023-12-24 05:40:36.427 ServerApp] Kernel started: 8613a08b-be38-4888-9cbf-2cd149f0f508
0.00s - Debugger warning: It seems that frozen modules are being used, which may
0.00s - make the debugger miss breakpoints. Please pass -Xfrozen_modules=off
0.00s - to python to disable frozen modules.
0.00s - Note: Debugging will proceed. Set PYDEVD_DISABLE_FILE_VALIDATION=1 to disable this validation.
[I 2023-12-24 05:40:38.047 ServerApp] Connecting to kernel 8613a08b-be38-4888-9cbf-2cd149f0f508.
[I

How to Install Jupyter Notebook on Windows 11 2024

- create env

- pip install jupyter

- start "jupyter notebook"

Setup I2C LCD on Raspberry pi

I2C (inter-integrated circuit) uses two wires to send and receive data and two wires to Vcc and ground.

- install I2C-tools: sudo apt-get install i2c-tools.

- install SMBUS: sudo apt-get install python-smbus.

- reboot.

- connect the I2C LCD to Raspi

- in terminal: i2cdetect -y 1 . This will show a table of addresses for each I2C device connected to Pi.

- put the I2C address of your LCD in line 22 of the library code. For example, my I2C address is 21, so I’ll change line 22 to ADDRESS = 0x3f.

- in terminal: nano I2C_LCD_driver.py

# -*- coding: utf-8 -*-
# Original code found at:
# https://gist.github.com/DenisFromHR/cc863375a6e19dce359d
"""
Compiled, mashed and generally mutilated 2014-2015 by Denis Pleic
Made available under GNU GENERAL PUBLIC LICENSE
# Modified Python I2C library for Raspberry Pi
# as found on http://www.recantha.co.uk/blog/?p=4849
# Joined existing 'i2c_lib.py' and 'lcddriver.py' into a single library
# added bits and pieces from various sources
# By DenisFromHR (Denis Pleic)
# 2015-02-10, ver 0.1
"""
# i2c bus (0 -- original Pi, 1 -- Rev 2 Pi)
I2CBUS = 1
# LCD Address
ADDRESS = 0x3f
import smbus
from time import sleep
class i2c_device:
   def __init__(self, addr, port=I2CBUS):
      self.addr = addr
      self.bus = smbus.SMBus(port)
# Write a single command
   def write_cmd(self, cmd):
      self.bus.write_byte(self.addr, cmd)
      sleep(0.0001)
# Write a command and argument
   def write_cmd_arg(self, cmd, data):
      self.bus.write_byte_data(self.addr, cmd, data)
      sleep(0.0001)
# Write a block of data
   def write_block_data(self, cmd, data):
      self.bus.write_block_data(self.addr, cmd, data)
      sleep(0.0001)
# Read a single byte
   def read(self):
      return self.bus.read_byte(self.addr)
# Read
   def read_data(self, cmd):
      return self.bus.read_byte_data(self.addr, cmd)
# Read a block of data
   def read_block_data(self, cmd):
      return self.bus.read_block_data(self.addr, cmd)

# commands
LCD_CLEARDISPLAY = 0x01
LCD_RETURNHOME = 0x02
LCD_ENTRYMODESET = 0x04
LCD_DISPLAYCONTROL = 0x08
LCD_CURSORSHIFT = 0x10
LCD_FUNCTIONSET = 0x20
LCD_SETCGRAMADDR = 0x40
LCD_SETDDRAMADDR = 0x80
# flags for display entry mode
LCD_ENTRYRIGHT = 0x00
LCD_ENTRYLEFT = 0x02
LCD_ENTRYSHIFTINCREMENT = 0x01
LCD_ENTRYSHIFTDECREMENT = 0x00
# flags for display on/off control
LCD_DISPLAYON = 0x04
LCD_DISPLAYOFF = 0x00
LCD_CURSORON = 0x02
LCD_CURSOROFF = 0x00
LCD_BLINKON = 0x01
LCD_BLINKOFF = 0x00
# flags for display/cursor shift
LCD_DISPLAYMOVE = 0x08
LCD_CURSORMOVE = 0x00
LCD_MOVERIGHT = 0x04
LCD_MOVELEFT = 0x00
# flags for function set
LCD_8BITMODE = 0x10
LCD_4BITMODE = 0x00
LCD_2LINE = 0x08
LCD_1LINE = 0x00
LCD_5x10DOTS = 0x04
LCD_5x8DOTS = 0x00
# flags for backlight control
LCD_BACKLIGHT = 0x08
LCD_NOBACKLIGHT = 0x00
En = 0b00000100 # Enable bit
Rw = 0b00000010 # Read/Write bit
Rs = 0b00000001 # Register select bit
class lcd:
   #initializes objects and lcd
   def __init__(self):
      self.lcd_device = i2c_device(ADDRESS)
      self.lcd_write(0x03)
      self.lcd_write(0x03)
      self.lcd_write(0x03)
      self.lcd_write(0x02)
      self.lcd_write(LCD_FUNCTIONSET | LCD_2LINE | LCD_5x8DOTS | LCD_4BITMODE)
      self.lcd_write(LCD_DISPLAYCONTROL | LCD_DISPLAYON)
      self.lcd_write(LCD_CLEARDISPLAY)
      self.lcd_write(LCD_ENTRYMODESET | LCD_ENTRYLEFT)
      sleep(0.2)

   # clocks EN to latch command
   def lcd_strobe(self, data):
      self.lcd_device.write_cmd(data | En | LCD_BACKLIGHT)
      sleep(.0005)
      self.lcd_device.write_cmd(((data & ~En) | LCD_BACKLIGHT))
      sleep(.0001)
   def lcd_write_four_bits(self, data):
      self.lcd_device.write_cmd(data | LCD_BACKLIGHT)
      self.lcd_strobe(data)
   # write a command to lcd
   def lcd_write(self, cmd, mode=0):
      self.lcd_write_four_bits(mode | (cmd & 0xF0))
      self.lcd_write_four_bits(mode | ((cmd << 4) & 0xF0))
   # write a character to lcd (or character rom) 0x09: backlight | RS=DR<
   # works!
   def lcd_write_char(self, charvalue, mode=1):
      self.lcd_write_four_bits(mode | (charvalue & 0xF0))
      self.lcd_write_four_bits(mode | ((charvalue << 4) & 0xF0))
  
   # put string function with optional char positioning
   def lcd_display_string(self, string, line=1, pos=0):
    if line == 1:
      pos_new = pos
    elif line == 2:
      pos_new = 0x40 + pos
    elif line == 3:
      pos_new = 0x14 + pos
    elif line == 4:
      pos_new = 0x54 + pos
    self.lcd_write(0x80 + pos_new)
    for char in string:
      self.lcd_write(ord(char), Rs)
   # clear lcd and set to home
   def lcd_clear(self):
      self.lcd_write(LCD_CLEARDISPLAY)
      self.lcd_write(LCD_RETURNHOME)
   # define backlight on/off (lcd.backlight(1); off= lcd.backlight(0)
   def backlight(self, state): # for state, 1 = on, 0 = off
      if state == 1:
         self.lcd_device.write_cmd(LCD_BACKLIGHT)
      elif state == 0:
         self.lcd_device.write_cmd(LCD_NOBACKLIGHT)
   # add custom characters (0 - 7)
   def lcd_load_custom_chars(self, fontdata):
      self.lcd_write(0x40);
      for char in fontdata:
         for line in char:
            self.lcd_write_char(line)

- Now, we can test it with hello world, in terminal: nano test.py

import I2C_LCD_driver
mylcd = I2C_LCD_driver.lcd()
mylcd.lcd_display_string("Hello world", 1)

- make sure, you have python installed and between library and python files in one directory.

- run it in terminal: python test.py

Resolve OPENCV PYTHON Problem for your Environment Project

Several opencv problem and the resolve:

_____

- Problem:

on centos
ImportError: libGL.so.1: cannot open shared object file: No such file or directory

- Resolve: 

yum install mesa-libGL

_____

- Problem:

cannot start Anaconda environment in windows

- Resolve: 

C:\Users\webiot>D:/Anaconda/Scripts/activate

_____

- Problem:

cv2.error: OpenCV(3.4.17) D:\a....\opencv-python\opencv-python\opencv\modules\highgui\src\window.cpp:383: error: (-215:Assertion failed) size.width>0 && size.height>0 in function 'cv::imshow'

- Resolve: 

camera=cv2.VideoCapture(0) #check for input device, maybe 0 or 1 etc.

_____

- Problem:

recognizer = cv2.face.LBPHFaceRecognizer_create(); #create a recognizer, LBPH is a face recognition algorithm.Local Binary Patterns Histograms
AttributeError: module 'cv2' has no attribute 'face'

- Resolve: 

pip uninstall opencv-contrib-python

and install again:

pip install opencv-contrib-python

_____

- Problem:

faces=detector.detectMultiScale(frame,1.1,7)

cv2.error: OpenCV(3.4.17) D:\a\opencv-python\opencv-python\opencv\modules\objdetect\src\cascadedetect.cpp:1729: error: (-215:Assertion failed) !empty() in function 'cv::CascadeClassifier::detectMultiScale'

- Resolve: 

run python as your path in the code

_____

- Problem:

sqlite3.OperationalError: no such column: 

- Resolve: 

check your parameter and add the value with single Quote each.

_____

- Problem:

sqlite3.OperationalError: database is locked

- Resolve: 

close all opened db browser

_____

- Problem:

CvCapture_MSMF::grabFrame videoio(MSMF): can't grab frame. Error: -2147483638

- Resolve: 

downgrade your opencv-python with:

(base) C:\Users\webiot>pip uninstall opencv-python

(base) C:\Users\webiot>pip install opencv-python==3.4.17.63

(base) C:\Users\webiot>pip install opencv-contrib-python==3.4.17.63

_____

ANATHOR PROBLEM IN PYTHON

- Problem:

ModuleNotFoundError: No module named 'mysql.connector'; 'mysql' is not a package

- Resolve: 

if you have install the mysql connector by: pip install mysql-connector-python

You make sure or rename your py file not as mysql.py

_____

- Problem:

Redirect has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header

- Resolve: 

Add this extension on chrome browser:

Allow CORS: Access-Control-Allow-Origin

_____

- Problem:

python flask not reading image from ajax POST request form

- Resolve: 

make sure that params use encodeURIComponent(uri):

ex:

client side

var tes = canvas.toDataURL("image/jpeg");

params = "baseku="+encodeURIComponent(tes);

xmlhttp.send(params);

server side

@app.route('/img', methods=['POST'])

def img():

    if 'baseku' in request.form:

        photo_base64 = request.form['baseku']

        return jsonify(response=photo_base64)

_____

How To Setup Raspberry and RFID RC522 With very simple

Setup the RFID RC522 to Raspi like this:

- SDA connects to GPIO8 (Physical Pin 24)

- SCK connects to GPIO11 (Physical Pin 23)

- MOSI connects to GPIO10 (Physical Pin 19)

- MISO connects to GPIO9 (Physical Pin 21)

- GND connects to Breadboard Ground Rail. (20)

- RST connects to GPIO25 (Physical Pin 22)

- 3.3v connects to 3.3v (Physical Pin 1)

Enabled SPI (Interfaces)

pi@pi:~ $ sudo raspi-config

enabled SPI and reboot

pi@pi:~ $ sudo reboot

Test

pi@pi:~ $ lsmod | grep spi

spidev                 20480  0

spi_bcm2835            20480  0

Install

pi@pi:~ $ sudo pip3 install spidev

Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple

Requirement already satisfied: spidev in /usr/lib/python3/dist-packages (3.4)

pi@pi:~ $ sudo pip3 install mfrc522

Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple

Collecting mfrc522

  Downloading https://files.pythonhosted.org/packages/d5/b5/d33c0634cece0931c3c4e0978b0db58f248045c3b379ccf2d512b76fe044/mfrc522-0.0.7-py3-none-any.whl

Requirement already satisfied: RPi.GPIO in /usr/lib/python3/dist-packages (from mfrc522) (0.7.0)

Requirement already satisfied: spidev in /usr/lib/python3/dist-packages (from mfrc522) (3.4)

Installing collected packages: mfrc522

Successfully installed mfrc522-0.0.7

Make Directory and Python file

pi@pi:~ $ mkdir ~/pi-rfid

pi@pi:~ $ nano ~/pi-rfid/read.py

#!/usr/bin/env python

import RPi.GPIO as GPIO

from mfrc522 import SimpleMFRC522



reader = SimpleMFRC522()

try:

        id, text = reader.read()

        print(id)

        print(text)

finally:

        GPIO.cleanup()

Save it and test the file and tap the card

pi@pi:~ $ python3 ~/pi-rfid/read.py

627793730761

pi@pi:~ $ python3 ~/pi-rfid/read.py

658172191773