Python Cheat Sheet 4 - type system, control flow

Table of Contents

Python's type hierarchy

Under numbers, Python has two categories:

• Integral
  • Integers
  • Boolean, yes these are integers (0,1)
• Non-integral
  • Floats, which are c doubles
  • Complex
  • Decimals
  • Fractions, to better represent numbers with repeating decimals

Python's Collections type hierarchy

• Sequences
  • Mutable
    • Lists
  • Immutable
    • Tuples
    • Strings
• Sets
  • Mutable
    • Sets
  • Immutable
    • Frozen Sets
• Mappings
  • Dictionaries

Python's Callables and Singletons

• Callables
  • User defined funcitons
  • generators
  • classes
  • instance methods
  • class instances (call())
  • Std. library built-in functions (e.g.: len(), open())
  • Std. library built-in methods (e.g.: my_list.append())
• Singletons - only one instance of these can exist.
  • None
  • NotImplemented
  • Ellipsis (...) -> Find more about this.