# best practices for naming conventions
# lowercase > variable firstname function mycalculator() filename code
# TitleCase > filename Modules Class Names Contacts Service Names
# UPPERCASE > PROVIDERS / INPUTS
# underscore_case / snake_case > variables first_name method names
# camelCase > rules for lowercase

# DRY Don't Repeat Yourself

# Python Core Modules > Functions you get install Python automatically
# Python Standard Modules > Installed with Python BUT import app
# Python Custom Modules > your custom, extensions pypi.org, github pip

# page 10
a = 7 # a variable name data type int value 7
b = 3 # whitespace does not matter but be pythonic type syntax
c = 9
x = ( a + b ) * c # ( 7 + 3 )  * 9   output 90
print(x) # function name with tuple decorator()

# page 14
# input() always assumes the value to be a string
firstName = input("Enter your first name: ") # form <input> web
lastName = input("Enter your last name: ")

# Join Level 1 way of working with strings data types have to match
fullName = firstName + " " + lastName # stored in memory
print("Contact full name: " +  fullName) # join

# page 18 get first char of last name
# bracket notation structure [list] {set} (tuple)
charOfLastName = lastName[0]
print(charOfLastName)  # asserted value M

vipStatus = True
print( type(vipStatus) )  # type of object in memory

# while keyword DEFINE break "infinity"  page 21
print("While loop")
i = 0 # control variable
while i < 10: # while condition is True
    # indentation tab or 4 spaces
    # scope of the operation  java/js/c#,...  { ops; }
    print(i)
    i += 1

print("--------------")
print("For loop")
# for keyword BUILT IN break  page 23
for i in range(0,10):
    print(i)