###### TEST REMINDERS ######
# Must be done at 2 - 3:30 pm on Wednesday (for non-SDAC students)
# Highly recommend you attend the Zoom session
#   you may ask clarification questions during Zoom
#   typos may be announced during the Zoom session
# You may not use any notes, homework, classwork, internet except the ones that are allowed on the website
# Download all of the files at the start of class and not before
# Submit as you go
# Triple check that you have submitted all the files
# There will be a separate Zoom session just for the TAs where you can ask us questions outloud and not just
#   through chats
# GOOD LUCK! 🍀🍀🍀

import url

# if error is something like link is bad --> make sure there's no typo --> must be exact
# if 404 error - the file is not found - that url doesn't exist --> also check spelling of the filename or the
# repository

repository = "http://www.cs.virginia.edu/~cs1112/datasets/csv/"
filename = "elevations.csv"
link = repository + filename # get complete link to a specific file

# uncomment these lines for filename = "romans.csv"
# text = url.get_contents( link )   # get us the content of page as a big string
# print( text )
#
# number_of_lines = text.count( "\n" )   # count the number of new line characters --> tells us how many lines
#                                        # there are in text
#                                        # this is the same as trying to find how many rows there are
#                                        # we can't use len( text ) because text is a string and not a dataset
#
# print( number_of_lines )
# print()

table = url.get_dataset( link ) # get the formatted table of the content

for row in table:
    print( row )

header = table[0]   # get the 0th row of the table
data = table[ 1 : ] # get row 1 and the rest of the rows from table

print()
########  SPLICING  ############
# LIST SPLICING

first_two_data_rows = data[0 : 2]   # the first two rows of the table <data> starts at 0 and includes
                                    # rows up to but NOT including 2
# this is a new table that has two rows: the 0th row from <data> + 1st row from <data>
# same as:
# first_two_data_rows = table[1 : 3] # we used data because we don't want the header row and
                                     # the rest of rows in <table> is in <data> also

print( first_two_data_rows )
print()

# STRING SPLICING
# very similar to list
s = "zyxwvutsrqponmlk"
#    0123456789...
i = 4
j = 7
substring = s[i : j]    # get a smaller string from s where it contains characters from index <i> to characters
                        # up to but not including at index <j>
# substring = "vut"
print( substring )


###### REMAINDER OPERATOR #####
# %
x = 125
ones = x % 10  # get the last digit of x == get the remainder of 125 / 10 --> 5
last_two_digits = x % 100    # get the last two digits of x == get the remainder of 125 / 100 --> 25
                             # 125 goes into 100 once, with 25 as remainder
# the remainder will never be bigger than the second number
base_4_numbers = [0, 1, 2, 3] # when number is 4, 4 % 4 = 0

import random
random.seed( x )    # only set seed once and before using any random functions

digit = random.randrange(0, 4)
# or digit = random.choice( base_4_numbers )
# lines 68 and 69 are essentially the same thing