core_lesson6

Lesson 6 - Dealind with Sequences of Objects

Ch2-3 Lists

• list("string") => ['s', 't', 'r', ...]
• Each item in a list is called an element
  • Can be accessed by referring to its index
• Slicing
  • [start, end]
  • Does not include the element at index end
• Nested lists
  • Lists containing another list
• Mutable - can be altered
  • del list[1] removes the element at index 1
• Overloaded operators
  • Concatenation +
  • Repetition *
  • Note to self, strings are character arrays
• Membership
  • in
    • checks if element is in the list

Ch4 For Loops

• Iterate over a collection of objects
• continue
  • Jumps back to the beginning of the loop
• range(start, end)
  • Ending number not included in the "range"
• VS while
  • Use for when iterating over a fixed collection
  • Don't modify the list while iterating
  • while loops give more control

Ch6 Git Snapshots

• Detached head
  • unreachable without commit hash

Ch7 Tuples

• Tuples are immutable
  • Can't be changed
  • Can't add elements, remove elements, nor change elements
• Single element tuple (1,)
  • Add comma
• Overloaded operators
  • Same as lists +, *

Ch8 Strings

• Strings are immutable

Ch9 Testing

• Test driven development
• Write test cases before writing the function
• Convention
  • Start function names with test_
• Focus on edge cases
  • Think of all possible cases that could go wrong
• Unit testing
  • Testing the correctness of a single unit of the code
• Debug mode
  • Pausing at certain lines
    • Setting breakpoints
      • breakpoint()

Ch10 Styling

• No spaces before opening bracker
• No spaces immediately inside bracket
• Spaces in slicing operations
• Trailing commas
  • Useful when list is expected to be extended
  • No space between trailing comma and closing parenthesis
• Aligning brackets