Arrays

# arrays

# list or table of related items

# 1 dimensional array = > list

# index    0  1  2  3  4   always starts at zero 0
scores = [45,52,63,24,34]

print (len(scores))

print("1st item",scores[0])

print("last item using direct index",scores[4])
print("last item using length index",scores[(len(scores))-1]) # if you see a -1 in an exam be careful
print("last item using direct index from the other end",scores[-1])

# 2 dimensional array

# currency exchange rates
# https://www.exchangerates.org.uk/


"""
       0          1
0 GBP EUR       1.1897  Pounds to Euros
1 GBP USD       1.3475  Pounds to Dollars
2 GBP NZD       1.9846  Pounds to New Zealand Dollars

"""

# array = list of lists in python

#  list                   0                1               2
#  item                0       1       0       1       0       1
exchange_rates = [["EUR", 1.1897],["USD", 1.3475],["NZD", 1.9846]]

print(len(exchange_rates))

print("1st item",exchange_rates[0])
print("1st item",exchange_rates[0][1])

cash_held = float(input("how much cash have you got >> "))  # need to be a float for decimal amount
buy_currency = input("what currency do you want to buy >> ") # enter the code
currency_amount = 0 # asign exchaged amount

for each_item_index in range(len(exchange_rates)):
    #print(each_item_index) testing
    if exchange_rates[each_item_index][0] == buy_currency:
        currency_amount = cash_held * exchange_rates[each_item_index][1]

print(str(cash_held) + " would buy you " + str(currency_amount) + " " + buy_currency ) # easier way to do this line

print(cash_held," would buy you ",currency_amount,buy_currency ) # easier way to do this line


"""
EXTENSION IDEAS
1.  add more currencies
2.  add to convert the other way say you had dollars and wanted GBP ( multiply by 1/ rate)
3.  add a while loop so keeps going until a key word ("Quit" say) is entered for the country code
4.  export to an offline file, as a data backup extension