Programmierung

Git / Github

• codedownload von github in weniger als 1 minute
• github for dummies

Python

• Online Python Tutor
• print() Formatierung
• notes and tips for updating from Python 2 to Python 3
• https://docs.python.org/3.1/library/index.html#library-index
• https://py-tutorial-de.readthedocs.io/de/latest/index.html
• https://www.w3schools.com/python/default.asp
• https://www.python-kurs.eu/python3_kurs.php
• Python3 Tutorial
• Pyton QT Raspberry
• SELF Explained
• Objekte & self
• https://en.wikibooks.org/wiki/A_Beginner's_Python_Tutorial
• https://pythonspot.com
• https://realpython.com/python3-object-oriented-programming/#what-is-object-oriented-programming-oop

Codeexamples

#An example of a class
class Shape:
   def __init__(self, x, y):
       self.x = x
       self.y = y
       self.description = "This shape has not been described yet"
       self.author = "Nobody has claimed to make this shape yet"
   def area(self):
       return self.x * self.y
   def perimeter(self):
       return 2 * self.x + 2 * self.y
   def describe(self, text):
       self.description = text
   def authorName(self, text):
       self.author = text
   def scaleSize(self, scale):
       self.x = self.x * scale
       self.y = self.y * scale
#create 3 objekts of shape        
    rectangle = Shape(100, 45)  
    long_rectangle = Shape(120,10)
    fat_rectangle = Shape(130,120)
#finding the area of your rectangle:
    print(rectangle.area())
#finding the perimeter of your rectangle:
    print(rectangle.perimeter())
#describing the rectangle
    rectangle.describe("A wide rectangle, more than twice\
    as wide as it is tall")
#making the rectangle 50% smaller
    rectangle.scaleSize(0.5)
#re-printing the new area of the rectangle
    print(rectangle.area())

tkinter

• Grafik mit tkinter https://pythonbasics.org/tkinter/
• http://effbot.org/tkinterbook/tkinter-index.htm#class-reference
• https://tkdocs.com
• https://pythonbasics.org/tkinter_scale/
• Raspi GUI TKinter https://docs.python.org/3/library/tkinter.html#a-simple-hello-world-program

Diverse

• Online Progamming IDE verschiedenste Sprachen Java ,c c++ etc free
• Online-JAVA-Compiler free
• KISS_(Zufallszahlengenerator)

C

• Pointers

1. Pointer 2 Structs
2. Arduino Pointers
3. Pointers

#include <stdio.h>
#include <stdlib.h>
int main(void) {
  int x = 5; // Integervariable
  int *ptr ; // Pointer für Int variable
  ptr = &x;  // auf Adresse von x referenzieren
  printf("x ist %d \n",x);
  printf("Die Adresse von x ist %p \n",ptr);
  printf("Der Wert x ist %d \n",*ptr);   
  return EXIT_SUCCESS;
}

/* ptr1.c */
#include <stdio.h>
#include <stdlib.h>
struct menu
{
  int item;
  char titel[5];
};
int main(void) {
int n=2;
struct menu *ptr;
ptr = (struct menu*) malloc(n * sizeof(struct menu));
printf("Die Adresse von x ist %p \n",ptr);
char i1[] = "test_1";
ptr->item = 8;
//ptr->titel = i1;
(ptr+n)->item = 10;
//int x = 5; // Integervariable
 // int *ptr ; // Pointer für Int variable
 // ptr = &x;  // auf Adresse von x referenzieren
 // printf("x ist %d \n",x);
 // printf("size of struct is %u \n",sizeof(struct menu));
printf("Der Wert x ist %d \n",ptr->item);
printf("Der Wert x ist %d \n",(ptr+n)->item);
 // printf("Der Wert x ist %d \n",menu.item);
 return EXIT_SUCCESS;
}

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MYSQL

Escape 
Sequence    Character Represented by Sequence
  \0         An ASCII NUL (0x00) character.
  \'         A single quote (“'”) character.
  \"         A double quote (“"”) character.
  \b         A backspace character.
  \n         A newline (linefeed) character.
  \r         A carriage return character.
  \t         A tab character.
  \Z         ASCII 26 (Control+Z).
  \\         A backslash (“\”) character.
  \%         A “%” character. 
  \_         A “_” character.