PYTHON

PYTHON

1. >>>

   • prompt symbol of the Python console

2. IDLE

   • includes tools for writing and debugging entire programs

3. /

   • single slash to divide numbers produces a decimal (float)
   • dividing any two integers produces a float.
   • float can be added to an integer, because Python silently converts the integer to a float.

4. Dividing by zero in Python produces an error, as no answer can be calculated

   • the last line of an error message indicates the error's type

5. Computers can't store floats perfectly accurately

   • often leads to bugs

6. You can chain exponentiations together.

   • can rise a number to multiple powers

7. STRING

   • entering text between two single or double quotation marks
   • docstrings
     • used for block commenting
   • double quotes can't be directly included in a double quote string
     • placing a backslash
   • escape characters
     • Backslashes
       • to escape tabs, arbitrary Unicode characters, and various other things that can't be reliably printed

8. OUTPUT

   • programs take input and process it to produce output
   • print function to produce output
   • When a string is printed, the quotes around it are not displayed

9. INPUT

   • input function
     • function prompts the user for input, and returns what they enter as a string

10. CONCATENATION

    • strings in Python can be added
      • can be done on any two strings.
    • doesn't matter whether they've been created with single or double quotes.

11. STRING OPERATIONS

    • Strings can also be multiplied by integers
    • Strings can't be multiplied by other strings
    • Strings also can't be multiplied by floats

12. TYPE CONVERSION

    • can't add two strings containing the numbers 2 and 3 together to produce the integer 5
      • operation will be performed on strings, making the result '23
        • would use the int function
    • turning inputs to floats