# Chapter6.py

'''
data <singular value>
bit 0/1
byte 01000001  'A'
char 'A'  'n' 'd' 'y'
string Andy
number / bool / datetime / complex / float ...
[a-zA-Z0-9][specials]

collection class <collection of independent values>
Bob Joe Mary 21 True 12/24/2024 bunch of values
Lists [] index[0] dups mutatable<CRUDA>  Level 1
Sets {} collection of values without duplicates Level 2
Tuples () posid[0] param[1] dups readOnly immutable Level 1
Dictionary/Maps { key: value } { fname: Bob, lname: Bob }  key!dup:valuedup  valueUpdated Level 2

dimensional data <array/dimension of dependent values> Level 3
1 Dimensional Series -> col -> <value>
2 Dimensional DataFrame -> x/y row/col -> <value>
3 Dimensional aka PivotTable/Chart -> P1 row/col -> <value>
4 Dim P2 P1 -> row/col -> <value>
...
7 Dim   P5 P4 P3 P2 row/col -> <value>
'''

# Lists [] page 164 and Tuples () page 194
# Bob, Joe, Mary, Beth

firstName_list = ["Bob", "Joe", "Mary", "Beth"]

firstName_tuple = ("Bob", "Joe", "Mary", "Beth")

## Best Practices for Lists
## Create an EMPTY list object, then populate it with value
## 2 methods for updating data
### 1. use the insert() function then assign value
### 2. Preferred Best Practice -> use the index id to update the value    firstName_list[0] = "Robert"
## use the for x in ys loop to loop thru list data "for loop"
## Nesting Lists
### [ [ ], [ ] ]    List[List] Best Practice
### { [ ], [ ] }    optional List Set

# Lists can contain DISSIMILAR data types
# ["Bob", 21, True ]   [string, int, boolean]

# Add a contact to a master contacts list
contact = [] # Create an empty list object and store in memory
contact.append('Bob') # ['Bob']
contact.append(21) # ['Bob', 21 ]
contact.append(True) # ['Bob',21,True]
print(contact)

contacts = []
contacts.append(contact)
print(contacts) # [['Bob', 21, True]]

# Add a second contact to contacts
contact = [] # Create an empty list object and store in memory
contact.append('Mary')
contact.append(24) 
contact.append(False) 
print(contact) # ['Mary',24,False]

contacts.append(contact)
print(contacts) # [['Bob', 21, True], ['Mary', 24, False]]

# How do we access the individual objects in the loop

## for loop
## for x in ys
### x is the name of the variable in the subop/scope
### ys is where the data is coming from

for first_name in firstName_list:
    print(first_name) # Bob value without the ' ' 

# firstName_list = ["Bob", "Joe", "Mary", "Beth"]
# step 1 for loop gets the len(firstName_list) of ys -> 4
# l = len(firstName_list) -> 4
# step 2 create a control variable for the index
# let i = 0
## subop1 print(firstName_list[i]) i = 0 -> Bob
# step 3 i += 1 (increment i)  i = 1
# step 4 while i < len(firstName_list) is 1 < 4 True -> continue
# i = 1 -> Joe -> i + 1 -> i = 2
# while 2 < 4 -> continue -> Mary
# while 3 < 4 -> continue -> Beth
# while 4 < 4 -> False -> break for loop