Recap

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Recap#

In the first section we learned the very basics of python

Integer = 5
string = "String"
Float = 5.5

Common Pitfalls:

MyVariable = True
My_Variable = True

My Variable = True

  Input In [1]
    My Variable = True
       ^
SyntaxError: invalid syntax

Then we talked about if/else statements

if Integer <= 5:
          print("This integer is equal or less than 5")
else:
          print("The above statement is false")

This integer is equal or less than 5

Next were loops, especially for loops. For loops can be used to repeat an operation, examine lists, and, in general, speed up our programs.

loops

for i in range(5):
          print(i)

0
1
2
3
4

Common pitfalls:

for i in range(5)
print(i)

  Input In [7]
    for i in range(5)
                     ^
SyntaxError: invalid syntax

for i in range(5):
print(i)

  Input In [8]
    print(i)
    ^
IndentationError: expected an indented block

We extended this idea to the list datatype. Lists can be used to store variables of different datatypes.

MyList = [Integer,Float,string]

And we can also loop through these lists

for item in MyList:
          if item != 5:
                    print(item)
          else:
                    print(f"The value: {item} is equal to 5")

The value: 5 is equal to 5
5.5
String

We also saw that we can create a “list of lists”

fruits = ["Apple","Banana"]

overall_list = [fruits,MyList]

overall_list

[['Apple', 'Banana'], [5, 5.5, 'String']]

for list in overall_list:
          print(type(list),list)
print(type(overall_list))

<class 'list'> ['Apple', 'Banana']
<class 'list'> [5, 5.5, 'String']
<class 'list'>

And we stopped at a section where we defined functions. Functions can be used to prevent ourselves from repeating code snippets over and over again.

The overall syntax for functions goes like this

def MyFunction (List):
          '''
          This function takes a list as its input, repeats the list 5 times and returns it
          '''
          operation = List * 5

          return operation

MyFunction(overall_list)

[['Apple', 'Banana'],
 [5, 5.5, 'String'],
 ['Apple', 'Banana'],
 [5, 5.5, 'String'],
 ['Apple', 'Banana'],
 [5, 5.5, 'String'],
 ['Apple', 'Banana'],
 [5, 5.5, 'String'],
 ['Apple', 'Banana'],
 [5, 5.5, 'String']]

Schedule#

Today:

  • Functions and Modules notebook

  • DataStructures notebook

  • Maybe Intro to Machine Learning presentation

Tomorrow:

  • Intro to Machine Learning Presentation

  • Machine Learning Notebook

  • Course Evaluation

Any questions? Anything you would like to emphasize or learn about in the remaining two days?

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