猴子學Python - Business Computing in Python (week 3)

1. integer vs floating-point

   • type auto- assigned in python
   • concept of floating-point numbers
     The “binary point” my “float” to make the mapping flexible.
   • int(), float()
   • type is important for the computer to understand the binary value. Same binary can be different meanings in different types.

2. string

   • ASCII code, only one byte(-128 to 127)
   • chr() check the ASCII code of the given number.
   • len() to check the string’s length.
   • (+)
   • Other encod ing standards for CH or JP …etc.

3. casting

   • type conversion
   • print() uses “,” to seperate elements(tokens). It will auto-add a space in between.
     To remove the white space we can just concatnate two strings useing “+”.

4. assignment

   • use “=”
   • self assignment: a += 2, a -= 2, a/= 2
   • cascade assignment: a=b=c=d=…..=x

5. conditionals

   • if, else, elif

     if condition: statements

   • “:” and “indentation” are obligatory

6. boolean

   • True or False
   • often used with comparison operator

7. formatting

   • general guidelines:
     • Add proper spaces: wite spaces around operator, white space after each comma, empty lines to separate groups of codes.
     • Variable declaration: understandable names.
     • Write comments. (Use # and “”” )

Exercise:
money transfer confirmation

account1 = int(input("Account 1 balance:"))
account2 = int(input("Account 2 balance:"))
transfer = int(input("Transfer:"))

if transfer <= account1:
    account1 -= transfer
    account2 += transfer
else:
    transfer = account1
    account1 -= transfer
    account2 += transfer

print(account1, account2)

• Programming
• Python