# -*- coding: utf-8 -*-
"""
Created on Fri Oct  7 10:58:13 2022

@author: cpresser
"""
# Scope of variable: where it is available for use

"""
1. Good variable naming avoids confusion.
2. Don't use gloabl variables that aren't constants in functions.
"""



# Global variable -- available anywhere after it is declared
# x has global scope
x = "Hello"

def scopeFunction1(y):
    print(f"scopeFunction1: Global variable: {x}, argument: {y}")


def scopeFunction2(y):
    #local variable x
    # this x is available inside the function
    x = 5
    print(f"scopeFunction2: Local variable: {x}, argument: {y}")

def scopeFunction3(y):
    #would like to change the global variable x
    global x
    x = 5
    print(f"scopeFunction3: Global variable: {x}, argument: {y}")

#get global information into a function
def scopeFunction4(y, z):
    # can change z, wihtout chaning the global x
    z = 1
    print(f"scopeFunction4: argument1: {y}, argument2: {z}")


print(f"Global variable {x}")
scopeFunction1(7)
scopeFunction2(7)
print(f"Global variable {x}")

scopeFunction3(12)
print(f"Global variable {x}")
x = "I'm back!"
scopeFunction1(7)
print(f"Global variable {x}")

scopeFunction4(7, x)
print(f"Global variable {x}")

# print(y)  y is only available within the functions
y = True  #global variable y
print(True)