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+# Introduction to Learning Python
+
+Best place to start is the documentation [www.python.org](https:#www.python.org/) <br/>
+
+Download [Python 3](https:#www.python.org/downloads/) <br/>
+
+Docker images for Python on [Docker Hub](https:#hub.docker.com/_/python) <br/>
+
+
+# Run Python in Docker
+
+We can also run python in a docker container: <br/>
+
+```
+cd python\introduction
+
+docker build --target dev . -t python
+docker run -it -v ${PWD}:/work python sh
+
+/work # python --version
+Python 3.9.
+
+```
+
+# Our first Program
+
+* Create a folder containing our application source code
+
+```
+mkdir src
+
+```
+
+* Create basic source code
+
+In the `src` folder, create a program called `app.py`
+Paste the following content into it.
+
+```
+
+def main():
+	print("Hello, world.")
+
+main()
+```
+
+* Run your application code
+
+You can run your application 
+
+```
+/work # python src/app.py
+Hello, world.
+```
+
+# The Code
+
+In the video we cover writing functions. </br>
+It allows us to execute a block of code <br/>
+You want to give your function a single purpose <br/>
+Functions can have an input and return an output <br/>
+Well thought out functions makes it easier to write tests <br/>
+
+Instead of doing a boring `x + y` function that adds two numbers, let's do something a little
+more realistic but still basic: 
+
+```
+# This function returns some data 
+# The data could be coming from a database, or a file.
+# The person calling the function should not care
+# how the data is retrieved.
+# Since the function does not leak its Data provider
+
+def getCustomer():
+  return "Marcel Dempers"
+
+print(getCustomer())
+
+```
+
+# Function inputs
+
+As we saw, functions can return outputs, and also take inputs.
+Let's accept a customer ID and return a customer record with that ID:
+
+```
+def getCustomer(customerID):
+  return "CustomerID: " + customerID + ", Name: Marcel Dempers"
+
+print(getCustomer("abc"))
+```
+
+
+## Variables
+
+To hold data in programming languages, we use variables. <br/>
+Variables take up space in memory, so we want to keep it minimal. <br/>
+Let's declare variables in our function:
+
+```
+def getCustomer(customerID):
+  firstName = "Marcel"
+  lastName = "Dempers"
+  fullName = firstName + " " + lastName
+
+  return fullName
+
+  #or we can return the computation instead of adding another variable!
+  return firstName + " " + lastName
+
+  #or we don't even need to declare variables :)
+  return "Marcel Dempers"
+
+customer = getCustomer("abc")
+print(customer)
+
+```
+
+## Control Flows (if\else)
+
+You can see we're not using the `customerId` input in our function. <br/>
+Let's use it and showcase control flows to create logic! <br/>
+
+Control flows allow us to add "rules" to our code. </br>
+"If this is the case, then do that, else do something else".
+
+So let's say we have a customer ID 1 coming in, we may only want to
+return our customer if it matches the `customerID`
+
+```
+
+def getCustomer(customerID):
+  if customerID == "abc":
+    return "Marcel Dempers"
+  elif customerID == "def":
+    return "Bob Smith"
+  else:
+    return ""
+
+customer = getCustomer("abc")
+print(customer)
+
+```
+
+Let's invoke our function :
+
+```
+marcel = getCustomer("abc")
+print(marcel)
+
+bob = getCustomer("def")
+print(bob)
+
+```
+
+## Arrays
+
+Our function can only return one customer at a time. <br/>
+What if we wanted to return more than one customer. <br/>
+In real world systems, we may return database records. <br/>
+This is where we start looking at arrays, lists, dictionaries etc. <br/>
+
+Let's add another function to get an array of customers!
+
+```
+def getCustomers():
+  customers = [ "Marcel Dempers", "Bob Smith" ]
+  return customers
+
+customers = getCustomers()
+print(customers)
+```
+
+You can get array values by index starting at `0`:
+
+```
+customers = getCustomers()
+
+marcel = customers[0]
+bob = customers[1]
+
+print(marcel + "\n" + bob)
+
+```
+
+We can set a value in our Array. <br/>
+Arrays are fixed in size, notice we cannot just access a 
+record : <br/>
+
+```
+customers[2] = "John Smith"
+IndexError: list assignment index out of range
+
+```
+
+Instead we can use the `append()` function of the array to add items.
+
+```
+def getCustomers():
+  customers = [ "Marcel Dempers", "Bob Smith" ]
+  customers.append("James Baker")
+  customers.append("Jonathan D")
+  customers.append("Aleem Janmohamed")
+  customers.append("Ivo Galic")
+  customers.append("Joel Griffiths")
+  customers.append("Michael Spinks")
+  customers.append("Victor Savkov")
+  return customers
+
+```
+
+We can remove items with the `remove()` function.
+
+```
+customers.remove("Bob Smith")
+```
+
+# Dictionaries
+
+Dictionaries have an advantage whereby items can be found using a key. <br/>
+With arrays, we have to know the index number where the item is located or else we cannot find items unless we write a loop. <br/>
+With Dictionaries, we store key value pairs. So the key, may be our customer ID.<br/>
+
+Let's replace our customer array with a dictionary
+```
+  customers = {
+    "a": "James Baker",
+    "b": "Jonathan D",
+    "c": "Aleem Janmohamed",
+    "d": "Ivo Galic",
+    "e": "Joel Griffiths",
+    "f": "Michael Spinks",
+    "g": "Victor Savkov"
+  }
+
+```
+
+We can also set and access an item by key
+
+```
+#update or create item
+customers["h"] = "Marcel Dempers"
+
+#get an item
+marcel = customers["h"]
+print(marcel)
+
+```
+
+Let's update our `getCustomer()` function to get customer from our dictionary
+
+```
+def getCustomer(customerID):
+  customer = getCustomers()
+  return customer[customerID]
+
+def getCustomers():
+  customers = {
+    "a": "James Baker",
+    "b": "Jonathan D",
+    "c": "Aleem Janmohamed",
+    "d": "Ivo Galic",
+    "e": "Joel Griffiths",
+    "f": "Michael Spinks",
+    "g": "Victor Savkov",
+    "h" : "Marcel Dempers"
+  }
+  
+  return customers
+
+customers = getCustomers()
+customer = getCustomer("h")
+
+print(customer)
+print(customers)
+```
+
+## Loops 
+
+Loops are used to iterate over collections, lists, arrays etc. <br/>
+There are two primitive loops in Python </br>
+Let's say we need to loop through our customers
+
+### While loop
+
+While loops are simple to write by condition:
+
+```
+i = 0
+while i < 7:
+  print(customers[i])
+  i += 1
+```
+
+We can also use this condition to loop arrays:
+
+```
+customers = [ "Marcel Dempers", "Bob Smith" ]
+customers.append("James Baker")
+customers.append("Jonathan D")
+customers.append("Aleem Janmohamed")
+customers.append("Ivo Galic")
+customers.append("Joel Griffiths")
+customers.append("Michael Spinks")
+customers.append("Victor Savkov")
+i = 0
+while i <= 8:
+  print(customers[i])
+  i += 1
+```
+
+### For loops
+
+For looping a dictionary of list, `for` loops are a little easier:
+
+```
+customers = getCustomers()
+
+for customerID in customers:
+  print(customers[customerID])
+```
+
+## Classes and Objects
+
+So far so good, however, customer data is not useful as strings. <br/>
+Customers can have a firstname, lastname, and more properties. <br/>
+
+For this purpose we'd like to group some variables into a single variable. <br/>
+This is what `classes` allows us to do. <br/>
+Let's create a `class` for our customer
+
+```
+class Customer:
+  customerID = ""
+  firstName  = ""
+  lastName   = ""
+  def fullName(self):
+    return self.firstName + " " + self.lastName
+
+marcel = Customer()
+marcel.firstName = "Marcel"
+marcel.lastName = "Dempers"
+marcel.customerID = "h"
+
+print(marcel.fullName())
+
+```
+
+Now how can we create an object with our values without having to set every
+value individually ? 
+Constructors allow us to initialise our object with some default values.
+
+```
+class Customer:
+  def __init__(self, c="", f="", l=""):
+    self.customerID = c
+    self.firstName  = f
+    self.lastName   = l
+  def fullName(self):
+    return self.firstName + " " + self.lastName
+
+marcel = Customer("h", "Marcel", "Dempers")
+
+print(marcel.fullName())
+
+```
+
+Let's plug our class into our current application and put it all together:
+Firstly, we convert all our customers from strings to objects:
+
+```
+def getCustomers():
+  customers = {
+    "a": Customer("a","James", "Baker"),
+    "b": Customer("b", "Jonathan", "D"),
+    "c": Customer("c", "Aleem", "Janmohamed"),
+    "d": Customer("d", "Ivo", "Galic"),
+    "e": Customer("e", "Joel", "Griffiths"),
+    "f": Customer("f", "Michael", "Spinks"),
+    "g": Customer("g", "Victor", "Savkov"),
+    "h" : Customer("h", "Marcel", "Dempers")
+  }
+  
+  return customers
+```
+
+Then we can proceed to get our customer and access their fields:
+
+```
+customers = getCustomers()
+for customerID in customers:
+  print(customers[customerID].fullName())
+```
+
+# Docker
+
+So far we have used our container as a development environment. <br/>
+Docker allows us to run python in an isolated environment. <br/>
+Docker also has a concept of stages, I.E Docker Multistage. <br/>
+
+Therefore we may have a stage for development where we simply mount source code to access a python environment. In addition to this, we may add another layer for debugging where we can install debugger and extra development tools which we 
+do not want in production. <br/>
+Finally we can create a smaller stage which contains only python + our source which we can run as a runtime image in production.
+
+Example: 
+
+```
+FROM python:3.9.6-alpine3.13 as dev
+
+WORKDIR /work
+
+FROM python:3.9.6-alpine3.13 as debugging
+
+# add a debugger
+
+FROM dev as runtime
+COPY ./src/ /app 
+
+ENTRYPOINT [ "python", "/app/app.py" ]
+
+```
+
+## Building the Container
+
+```
+docker build . -t customer-app
+
+```
+
+## Running the Container
+
+```
+docker run customer-app
+```
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diff --git a/python/introduction/dockerfile b/python/introduction/dockerfile
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+FROM python:3.9.6-alpine3.13 as dev
+
+WORKDIR /work
+
+FROM python:3.9.6-alpine3.13 as debugging
+
+# add a debugger
+
+FROM dev as runtime
+COPY ./src/ /app 
+
+ENTRYPOINT [ "python", "/app/app.py" ]
diff --git a/python/introduction/src/app.py b/python/introduction/src/app.py
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+def getCustomer(customerID):
+  customer = getCustomers()
+  return customer[customerID]
+
+def getCustomers():
+  customers = {
+    "a": Customer("a","James", "Baker"),
+    "b": Customer("b", "Jonathan", "D"),
+    "c": Customer("c", "Aleem", "Janmohamed"),
+    "d": Customer("d", "Ivo", "Galic"),
+    "e": Customer("e", "Joel", "Griffiths"),
+    "f": Customer("f", "Michael", "Spinks"),
+    "g": Customer("g", "Victor", "Savkov"),
+    "h" : Customer("h", "Marcel", "Dempers")
+  }
+  
+  return customers
+
+class Customer:
+  def __init__(self, c="", f="", l=""):
+    self.customerID = c
+    self.firstName  = f
+    self.lastName   = l
+  def fullName(self):
+    return self.firstName + " " + self.lastName
+
+customers = getCustomers()
+for customerID in customers:
+  print(customers[customerID].fullName())
+
+
+
+