python-lec3-sep-04-24

in the lecture:

1. recap last lecture and solved hw2.

2. elif

3. if conditions-operators:

   1. "and" vs & : & =bitwise AND (working on the number in binary)
   2. short circuit in "and","or" operators: (condition1 and condition2 )=if the first condition is false, python will not check the other conditions in the if.
   3. and not balance==100_000 = balance!=100_000
   4. operators:
      1. and (&&): a <= 10 >= 12 / a >= 10 and a <= 12
      2. or (||)
      3. not (!=)
      4. is (==)
   5. match-case:
      1. match day=switch day
      2. without break-because the indentation
      3. case _: = default:
      4. merge cases: case 10 | 11| 12
      5. case _ if 0 <= grade <= 40

4. print format: https://docs.python.org/3/tutorial/inputoutput.html

"your name is {x}, your age is {y}."

print( **f**"your name is {x}, your age is {y}.")

options:

1. to print only 2 digits after the '.':

     print(f"Pi:{pi:.2f}")
   

2. to align the string:

   1. to the left <:add 20 spaces characters and align text to the left

       print(f"Name: {name1:<20} {age1}")
   

   2. to the right >: add 20 spaces characters and align text to the right

   print(f"Name: {name1:>20} {age1}")
   

   3. to the center ^: add 20 spaces characters and align text to the center (between the spaces

   print(f"Name: {name1:^20} {age1}")
   

   4. number to percentage: 0.5 to 50%:

      print(f"{prec:%}")
      

   5. percentage with 2 digits after the '.':

   print(f"percentage 2 digits after the .: {perc:.2%}")