Python Fundamentals (Part 1.)

Python Identifiers:

1. Starts with A-Z,a-z or underscore

2. DON't start with digits

3. DON'T use reserved keywords

4. Mandarin is allowed in Python 3

5. Case sensitive ( name , Name are different variables)

6. DON'T contain special characters or space

-----------------------------------------------------------

type() or .__class__ , id()

• Immutable : integer, float, string, tuple (new ids will be created when you assign the variable to a different value)

• mutable : list , dictionary, set (no new ids)

jupyter notebook screenshot

----------------------------------------------------------------------

What's the output of print(True + False)?

----------------------------------------------------------------------

int() , float() , division versus floor division

Jupyter Notebook Screenshot

---------------------------------------------

Ternary operator in Python (if.else, elif, and/or/not)

------------------------------------------------

For loop, range( starts , ends , step)

----------------------------------------------

For , While Loop

-----------------------------------------------

slicing with index ; str.replace() ; str.find() ; str.join() ; str.split()

------------------------------------------

String formatting

----------------------------------------------------

list.append() ; list.extend() (id remains the same)

list.insert() ; list.remove() ; list.pop() ; del list[n:m]

--------------------------------------------------------------------------

sorted V.S. sort()

• sorted(list) list won't change string can be sorted as well
  

• list.sort() list will change ; sort() can only be used on list

------------------------------------

Dictionary