Added the lesson 2 module

Author: myusufcse

lesson1/hello_world.py

@@ -10,12 +10,20 @@
 print("\t\tii. from module import name")
 print("\t\tiii. from module import name as shortName")
 print('v. To know the methods use python help method as below ')
-print("\t\t>>> help() or help(math)")
-print('vi. To use any library function import library.')
+print("\t\t>>> help() or help(math)")  # help(library name)
+print('vi. Generally, four whitespaces are used for indentation and are preferred over tabs.')
+print('vii. To use any library function import library.')
 print("\tEX:")
 print("\t\ti. import math")
 print("\t\tii. from math import factorial")
 print("\t\tiii. from math import factorial as fac")
 print("\nNext check factorial program to know more about importing library >> ".upper())
-
-
+"""
+I am a 
+multi line 
+comment
+"""
+# prefer # over 3". because if we assign it to any variable it will take that value.
+# I am also
+# a multi line
+# comments

lesson2/ScalarTypes.py

@@ -0,0 +1,90 @@
+print("Scalar data types: \n\tintegers, \n\tfloats, \n\tNone (str) and \n\tbool")
+
+# Assigning multiple values to multiple variables
+a, b, c = 5, 3.2, "Hello"
+
+print(a)
+print(b)
+print(c)
+
+# assign the same value to multiple variables at once
+x = y = z = "same"
+
+print(x)
+print(y)
+print(z)
+
+# To write multiple statements in the line use ;
+z = "not same"; print(y); print(z)
+
+# int type
+a = 0b1010  # Binary Literals
+b = 100  # Decimal Literal
+c = 0o310  # Octal Literal
+d = 0x12c  # Hexadecimal Literal
+
+# float type
+float_1 = 10.5
+float_2 = 1.5e2
+
+# Complex Literal
+x = 3.14j
+
+# Constant should be full uppercase But we can change the value here.
+PI = 13.14
+PI = PI - 10
+
+# str type
+strings = "This is Python"
+char = "C"
+string1 = None  # similar to null in java which is nothing
+
+# use , to concatenate the strings. similar + in java
+print(a, b, c, d)
+print(float_1, float_2)
+print(x, x.imag, x.real)
+print(PI)
+print(strings, char, string1)
+
+# bool type True or False
+x = (1 == True)
+y = (1 == False)
+a = True + 4  # True is 1
+b = False + 10  # False is 0
+
+print("x is", x)
+print("y is", y)
+print("a:", a)
+print("b:", b)
+print("all the below stmt return False")
+print(bool(0))  # False
+print(bool(0.0))  # False
+print(bool(""))  # False ? empty string
+print(bool({}))  # False ? empty dict
+print(bool([]))  # False ? empty list
+print(bool(()))  # False ? empty tuple
+
+print("all the below stmt return True")
+# Rest is True
+print(bool("True"))  # True
+print(bool("False"))  # True
+print(bool("0"))  # True
+print(bool(0.01))  # True
+print(bool(-12))  # True
+print(bool(2))  # True
+
+fruits = ["apple", "mango", "orange"]  # list
+numbers = (1, 2, 3)  # tuple
+alphabets = {'a': 'apple', 'b': 'ball', 'c': 'cat'}  # dictionary
+vowels = {'a', 'e', 'i', 'o', 'u'}  # set
+
+print(fruits, " is a ", type(fruits))
+print(numbers, " is a ", type(numbers))
+print(alphabets, " is a ", type(alphabets))
+print(vowels, " is a ", type(vowels))
+
+# type is used to find the type of variable or class name.
+print(type(1))
+print(type(1.2))
+print(type("me"))
+print(type(False))