Local and global scope, mutable lists

variables.py

greets = ["hi", "hello", "bye"]

print(greets[0].upper())

def cap_list(lst):
    pass # do this

cap_list(greets)
print(greets) # ["HI", "HELLO", "BYE"]


a = [1, 2, 3, 4, 5]
b = a[:]


def double_every_other(lst):
    for i in range(1, len(lst), 2):
        lst[i] = lst[i] * 2
        
double_every_other(b)


a[0] = 5

# given a list, produce a new list composed of 
# times 2 of every element of the list

def times_2_pure(lst):
    result = []
    for el in lst:
        result = result + [el * 2]
    return result

def times_2(lst):
    for i in range(len(lst)):
        lst[i] = lst[i] * 2
    
times_2_pure(a)
print(a)
times_2(a)
print(a)

def double_money(start_bal, target_bal, rate):
    start_bal = (start_bal * rate) + start_bal
    

start = 100
double_money(start, 300, .10)


def print_reverse(lst):
    for i in range(len(lst) - 1, -1, -1):
        print(lst[i])
        
print_reverse(b)
a = "Hello"
b = a
a = a + "!"
print(b)

a = [1, 2, 3, 4, 5]
b = a
a[0] = 5
print(b)


a = 5
b = a
a = 20
print(b)


def modList(lst):
   lst[0] = 5

a = [1, 2, 3, 4, 5]
modList(a)
print(a)


# def f2():
#     print(5)
#   
# def f3():
#     return print(5)
#
# x = f3()
# print(x)
  
# def first(a): 
#     a = 8
#     return a
#
# a = 20
# first(a)
# print(a)
#

# def printNumber(a):
#     a = 8
#     print(a)
#
#
# print("Hello")