core_lesson7

Lesson 7 - Objects and Dictionaries

Ch2 Object Identity

• Each python object has an identity
  • Unique integer ID for the object
• Can use is, is not operators to check
• id() returns the unique ID

Ch4 Dictionaries

• Lookup table with keys to retrieve values
• Keys should not be mutable
  • Don't use tuples apparently -_-
• get() can have default values if key doesn't exist
• key() retrieves all the keys, returns a list
• value() retrieves all the values, returns a list
• extend() concatenates dicts
• setdefault(), like get, but adds the entry if it doesn't exist

Ch6 Recursion

• Requires a base condition to stop the recursion

Ch7 Exception Handling

• Runtime errors, wrap code with try ... except blocks
• The finally must run
• Bare except clause is not recommended