Python Variables and Operators (PDF)

Section 2 Data types :  Variables are element, feature, or factor that is liable to vary or change. ‫هو العنصر او السمه او العامل الذى يمكن‬ ‫ان يتغير او يتنوع‬ Example 5x+3 X is variable  Constants are values that will not be changed within the operations. ‫هى قيم مش هتتغير...

Section 2 Data types :  Variables are element, feature, or factor that is liable to vary or change. ‫هو العنصر او السمه او العامل الذى يمكن‬ ‫ان يتغير او يتنوع‬ Example 5x+3 X is variable  Constants are values that will not be changed within the operations. ‫هى قيم مش هتتغير خﻼل العمليه‬ Example 5X+3 5 ,3 is constant  Operators are the used functions that build equations and operations. ‫هى الدوال المستخدمه لبناء معادله او‬ ‫عمليه حسابيه‬ Example 5x+3 + is operators Essential Python Variables 1. Strings A string is traditionally a sequence of characters (The gab is also a character). Example: “Hello”, “It is a true statement”, etc. Less operations are allowed. 2. Integers  An integer is a whole number (not a fraction) that can be positive, negative, or zero. Example: 71, 1245, - 80, etc Examples of operations: Add, Subtract, divide, etc. 3. Floats A double type can represent fractional as well as whole values. Example: 10.12, 134e12, etc Examples of operations: Add, Subtract, divide, etc To print / output result on console you can use Print( ) Example : Print(“hello world”) Print (“ welcome to third section”) Click on run The result appear on console Example 1: Make rectangle by using python print ("/ / / / / / / /") print ("/ / / / / / / /") print ("/ / / / / / / /") print ("/ / / / / / / /") Example 2: Make triangular by using python ‫مثلث قائم الزاويه من اليمين‬ print(" *") print(" **") print(" ***") print(" ****") print(" *****") print(" ******") ‫مثلث قائم الزاويه من اليسار‬ print(" *") print(" **") print(" ***") print(" ****") print(" *****") print("******") -------------------------------------------------------------------- ‫مثلث هرمى‬ print(" * ") 1 print(" *** ") 3 print(" ***** ") 5 print(" ******* ") 7 print(" ********* ") 9 print("***********") 11 --------------------------------------------------------- Make square by using python print("* * * * * * *") print("* * * * * * *") print("* * * * * * *") print("* * * * * * *") print("* * * * * * *") print("* * * * * * *") print("* * * * * * *")  ------------------------------------------------------- print (" /|") print (" / |") print (" / |") print (" / |") print (" /____|") Input  to insert value by user Variable = input(“message to user : ”) EX 1 : EX 2: x=input() x=input(“enter the value of x: ”) print(x) print (x) EX 3: x=input("enter the value of x: \n") print(x) note : \n to take new line EX1: x=1 x+=1 the same to x=x+1 print(x) EX2: x=1 y=2 x=x/y print(x) x=2 Assignment statement x=x+2 Assignment with expression print(x) Print statement y=0.2 print( int (y) ) output =0 y=3.2 print(int (y) ) output =3 y=1.7 print(str(y) ) output=1.7 a = 1.9 b=1 x = int(a) * int(b) print(x) output=1 b = 1.1 c = 0.9 if int(b) == int(c): a=5 print(a) if statement syntax if condition : code if yes EX 1: a=1 b=1 c=2 d=3 if a == b: c=d print(c) output  3 EX 2: a=1 b=2 c=2 d=3 if int(a) == int(b): c=d print(c) output 2 to make a comment you can use ( # ) # hello Working with Strings Result # This is a comment! greeting_1 = "Hello“ # assigning a string value to a variable print(greeting_1) # display the first variable named greeting_1 greeting_2 = ", friend!“ # assigning a string value to another variable print(greeting_2) # display second variable named greeting_2 greeting = greeting_1 + greeting_2 # combining more than a string into 1 print(greeting) # display the combining variable print(len(greeting)) # display the number of characters in the string print(greeting) # display the first character of the string print(greeting) # display character number 10 (last character) print(greeting[-1]) # display the last character print(greeting.replace("friend", " Ahmed")) # replace 'friend' with 'Ahmed' greeting_new_line = greeting_1 + "\n" + greeting_2 # new line print(greeting_new_line) # display the string divided on two lines print(len(greeting_new_line)) # display the number of characters in the string Hello , friend! Hello, friend! 14 ! Hello, Ahmed! Hello , friend! 15