.py

# Data Types in Python 

# String - Combination of alphanumeric characters 33AAA$%^
# Int - Numbers without decimal (whole numbers) 34, 2,1 100, 986
# Float - Numbers with decimal 5.23, 3.142, 5.0 
# Bool - YES/NO, TRUE/FALSE, 1/0, ON/OFF 

# Variables 
name = "John"
age = 34 
pi = 3.142 
is_open = True # Snake casing 

# Python uses snake casing 

# JS, Swift, Java, Dart, C# uses Camel Casing 

# Don't use Python Language reserve words as your variable names

first_name = "John"
last_name = "Doe"

# Immutability - String are immutable/ They cannot be changed
#print(first_name + last_name + "22" + "aa" + "cc" + "dd" + "ff")

company = "DigitalCrafts"
cohort = "Feb 2021"

#message = "Welcome to " + company + " " + "Cohort " + cohort

message = f"Welcome to {company} and cohort is {cohort}"

print(message)

# Asking for user input 

# input function always returns you as a String datatype 
full_name = input("Please enter your full name: ")
car_make = input("Enter make of your car: ")
car_model = input("Enter model of your car: ")

print(full_name)
print(car_make)
print(car_model)

functions.py

first_name = "John"
last_name = "Doe"
customer_id = "123456"

#display_user() # Result in an error because the function does not exists

# Functions should be small. They should be reusable 
# Functions should ONLY DO ONE AND ONE THING ONLY
def display_user():
    print(f"*******{customer_id}********")
    print(f"My first name is {first_name} and last name is {last_name}")
    print("***********************")

print("I am not part of the display_user function")

display_user() 

print("code ...")
print("some more code ....")

display_user() 


#print("***********************")
#print(f"My first name is {first_name} and last name is {last_name}")
#print("***********************")


#name is a local variable and available only inside the function
def greet(name,age): 
    print(f"Hello {name} and my age is {age}")

greet("Mary",34) 
greet("Alex",56)
greet("John",67)

# causes an error because age is declared inside the greet function
#print(age) 

# A good function is a function with NO arguments 


def calculate_overdraft_fee(amount): 
    return amount * 0.10
    print("Not executed")

overdraft_fee = calculate_overdraft_fee(100)
if overdraft_fee > 20: 
    print("lock the account")

def add(no1, no2):
    return no1 + no2


result = add(2,3)
print(result)

# TUPLE 

def airportNameAndCode(address):
    return ("Intercontinental Airport", "IAH") # tuple 
    # lines is ignored because it is after the first return 
    return "IAH" 
    print("Ignored...")

(airport_name, airport_code) = airportNameAndCode("1200 Richmond Ave")

# Optional Arguments 
def greet_with_optional_age(name, age = 32):
    print(name)
    print(age)

greet_with_optional_age("Alex Doe", 65)