Hello Everyone,
In this section we will learn how to control the flow of execution of statements in a program by using "if" , "elif" & "else" statements.
Learn how to repeat code blocks by using iteration - (meaning - the repetition of a process) tools in python such as "for" and "while" loops.
Lets get on with the code:-
Boolean Algebra (True/False) [T/F]
Understand 'and' truth tables logic
***********
T + T = T
T + F = F
F + F = F
F + T = F
***********
1) True / False (boolean)
A simple truth function (boolean logic + function) using 'and'
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | #_1 a simple truth function >>> def the_truth(): print(True and True) print(True and False) print(False and False) print(False and True) print() >>> the_truth() True False False False |
2) Replacing it with variables (t = True, f = False)
1 2 3 4 5 6 7 8 9 10 11 12 13 | >>> def the_truth(): print(t and t) print(t and f) print(f and f) print(f and t) print() >>> the_truth() True False False False |
3) A simple truth function (boolean logic + function + tuple)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | #_creating boolean logic + function + tuple >>> def the_truth(): print() print("True and True","=",True and True) print("True and False","=",True and False) print("False and False","=",False and False) print("False and True","=",False and True) print() >>> the_truth() True and True = True True and False = False False and True = False False and False = False >>> |
4) If you want in short form like say T / F
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | >>> x = True >>> x = str("T") >>> y = False >>> y = str("F") >>> >>> def the_truth(): print() print(x,"+",x,"=",x and x) print(x,"+",y,"=",x and y) print(y,"+",x,"=",y and x) print(y,"+",y,"=",y and y) print() >>> the_truth() T + T = T T + F = F F + T = F F + F = F >>> |
Understand 'or' truth tables logic
***********
T + T = T
T + F = T
F + F = F
F + T = T
***********
5) A simple truth function (boolean logic + function) using 'or'
1 2 3 4 5 6 7 8 9 10 11 12 13 | >>> def the_truth(): print(True or True) print(True or False) print(False or False) print(False or True) print() >>> the_truth() True True False True |
Understand 'xor' truth tables logic
***********
T + T = F
T + F = T
F + F = F
F + T = T
***********
6) A simple truth function (boolean logic + function) using 'or'
1 2 3 4 5 6 7 8 9 10 11 12 13 | >>> def the_truth(): print(True ^ True) print(True ^ False) print(False ^ False) print(False ^ True) print() >>> the_truth() False True False True |
7) Compound statement or combining them
1 2 3 4 5 6 7 8 9 10 11 | >>> print(True or False or False) True >>> print(True and False or True) True >>> print(True or False and True) True >>> print(not False &(True and True) or False) True >>> print(True ^ False and False or False) False >>> |
8) Simple if / else statement
1 2 3 4 5 6 7 8 | >>> x, y, z = 5, 10, 15 >>> if x < y and z > y: print(x) else: print(y) 5 >>> |
9) The above statement could be rewritten as follows
1 2 3 4 5 6 7 8 | >>> x, y, z = 5, 10, 15 >>> if x < z > y: print(x) else: print(y) 5 >>> |
10) Nesting "if" inside another "if"
1 2 3 4 5 6 7 8 | >>> if x < y: if z > y: print(x) else: print(y) 5 >>> |
11) Removing "else" and nesting another "if"
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | >>> if x < y: if z > y: print(x) print(y, '\n') if not x > y: print ('inverse!','\n') 5 10 inverse! >>> |
12) Simple elif statement (if can change multiple conditionals together)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | >>> if var == 1: print(var + 10) elif var == 3: print(var + 20) elif var == 5: print(var + 30) elif var == 7: print(var + 50) elif var == 9: print(var + 70) elif var == 10: print(var + 100) else: print('I think it\'s not in here') print() 110 >>> |
13) Using other comparison operators such as <=, >=, !=, etc
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 | >>> #using (<=) >>> if var <= 1: print(var + 10) elif var <= 3: print(var + 20) elif var <= 5: print(var + 30) elif var <= 7: print(var + 50) elif var <= 9: print(var + 70) elif var <= 10: print(var + 100) else: print('I think it\'s not in here') print() 110 >>> >>> #using (>=) >>> if var >= 1: print(var + 10) elif var >= 3: print(var + 20) elif var >= 5: print(var + 30) elif var >= 7: print(var + 50) elif var >= 9: print(var + 70) elif var >= 10: print(var + 100) else: print('I think it\'s not in here') print() 20 >>> >>> #using (!=) >>> if var != 1: print(var + 10) elif var != 3: print(var + 20) elif var != 5: print(var + 30) elif var != 7: print(var + 50) elif var != 9: print(var + 70) elif var != 10: print(var + 100) else: print('I think it\'s not in here') print() 20 >>> |
14) Ternary statement (allows for assignment of variable based on expression
1 2 3 4 5 6 | >>> test_variable = 1 >>> result = 10 if test_variable else '' >>> print(result, '\n') 10 >>> |
Hope you like the tutorial.
Python is simple and fun to play with and yet very powerful. 🔥
