(base) MAC:Tue Sep 01:10:32:week2> python Point.py 
Traceback (most recent call last):
  File "Point.py", line 6, in <module>
    p = Point(3,4)
TypeError: __init__() takes 1 positional argument but 3 were given
(base) MAC:Tue Sep 01:10:33:week2> !vi
vi Point.py
(base) MAC:Tue Sep 01:10:33:week2> !p
python Point.py 
<__main__.Point object at 0x7ffd394dc5d0>
(base) MAC:Tue Sep 01:10:33:week2> !vi
vi Point.py
(base) MAC:Tue Sep 01:10:34:week2> !p
python Point.py 
(3, 4)
(base) MAC:Tue Sep 01:10:34:week2> !vi
vi Point.py
(base) MAC:Tue Sep 01:10:36:week2> !p
python Point.py 
(3, 4)
(0, 0)
(base) MAC:Tue Sep 01:10:36:week2> !vi
vi Point.py
(base) MAC:Tue Sep 01:10:40:week2> !p
python Point.py 
(3, 4)
(0, 0)
5.0
Traceback (most recent call last):
  File "Point.py", line 19, in <module>
    print(p.taxicab_distance(q))
  File "Point.py", line 13, in taxicab_distance
    return math.abs(self.x - other.x) + math.abs(self.y - other.y)
AttributeError: module 'math' has no attribute 'abs'
(base) MAC:Tue Sep 01:10:40:week2> !vi
vi Point.py
(base) MAC:Tue Sep 01:10:40:week2> !p
python Point.py 
(3, 4)
(0, 0)
5.0
7
(base) MAC:Tue Sep 01:10:40:week2> !vi
vi Point.py
(base) MAC:Tue Sep 01:10:45:week2> jshell
|  Welcome to JShell -- Version 14.0.1
|  For an introduction type: /help intro

jshell> ArrayList<int> al = new ArrayList<>();
|  Error:
|  unexpected type
|    required: reference
|    found:    int
|  ArrayList<int> al = new ArrayList<>();
|            ^-^

jshell> //primitive types cannot be used as type parameters

jshell> 

jshell> ArrayList<Integer> al = new ArrayList<>();
al ==> []

jshell> al.add(56)
$2 ==> true

jshell> al.add(44)
$3 ==> true

jshell> al.add(15)
$4 ==> true

jshell> al
al ==> [56, 44, 15]

jshell> Integer q = 7;
q ==> 7

jshell> ## this is a tacit call to new.
|  Error:
|  illegal character: '#'
|  ## this is a tacit call to new.
|  ^
|  Error:
|  illegal character: '#'
|  ## this is a tacit call to new.
|   ^

jshell> //this is a tacit call to new.

jshell> 

jshell> Integer r = new Integer(5);
r ==> 5

jshell> int s = r;
s ==> 5

jshell> //unboxing

jshell> s.toString()
|  Error:
|  int cannot be dereferenced
|  s.toString()
|  ^--------^

jshell> Integer.BYTES
$9 ==> 4

jshell> Integer.MAX_VALUE
$10 ==> 2147483647

jshell> Integer.MIN_VALUE
$11 ==> -2147483648

jshell> Integer.TYPE
$12 ==> int

jshell> Integer n = Integer.valueOf(7);
n ==> 7

jshell> n = 7;
n ==> 7

jshell> String num  = "32324";
num ==> "32324"

jshell> int number = Integer.parseInt(num);
number ==> 32324

jshell> number
number ==> 32324

jshell> String crazy = "baaa";
crazy ==> "baaa"

jshell> number = Integer.parseInt(num, 16)
number ==> 205604

jshell> number
number ==> 205604

jshell> //this convertedd the string from base 16 to decimal

jshell> Integer.toString(1000, 16)
$21 ==> "3e8"

jshell> Integer.toString(1000, 5);
$22 ==> "13000"

jshell> Integer.parseInt("cows")
|  Exception java.lang.NumberFormatException: For input string: "cows"
|        at NumberFormatException.forInputString (NumberFormatException.java:68)
|        at Integer.parseInt (Integer.java:652)
|        at Integer.parseInt (Integer.java:770)
|        at (#23:1)

jshell> # exception is a runtime error
|  Error:
|  illegal character: '#'
|  # exception is a runtime error
|  ^
|  Error:
|  ';' expected
|  # exception is a runtime error
|                  ^

jshell> //exception is a runtime error

jshell> Character.BYTES
$24 ==> 2

jshell> Character.digit('a', 16)
$25 ==> 10

jshell> Character.isDigit('6')
$26 ==> true

jshell> Character.isWhitespace('\n')
$27 ==> true

jshell> Character.isWhitespace('\t')
$28 ==> true

jshell> Character.toString('a')
$29 ==> "a"

jshell> "" + 'a'
$30 ==> "a"

jshell> Double.parseDouble("6.02e23")
$31 ==> 6.02E23

jshell> Double.toString(45.4)
$32 ==> "45.4"

jshell> "" + 45.4
$33 ==> "45.4"

jshell> /exit
|  Goodbye
(base) MAC:Tue Sep 01:11:17:week2> ls
Point.py    session.txt
(base) MAC:Tue Sep 01:11:17:week2> vi BadBreath.py
(base) MAC:Tue Sep 01:11:45:week2> python BadBreath.py 
The square of 0 is 0.
The square of 1 is 1.
The square of 2 is 4.
The square of 3 is 9.
The square of 4 is 16.
16
(base) MAC:Tue Sep 01:11:45:week2> !vi
vi BadBreath.py
(base) MAC:Tue Sep 01:13:42:week2>