7 February 2022

Q1 This is on five minutes before class begins. Start it when you arrive.

Last Time We learned about the basic scalar types in Python: numbers (int, float, complex), booleans, and strings.

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Casting

picture of iron being cast

A cast is a temporary request to regard an object of one type as being of another. Be warned: not all casts make sense. Make a bad one and Python will throw an error, resulting in program death. Note, in the table below, everything casts to a string.

from/to	`int`	`float`	`bool`	`str`
`int`	*	"obvious" unless the integer is too big	`False` if 0, `True` otherwise	numerical string
`float`	truncates fractional part	*	`False` if 0, `True` otherwise	numerical string
`bool`	1 for `True` and 0 for `False`	1 for `True` and 0 for `False`	*	boolean string
`str`	the value given, if the string is a parseable integer	the value given, if the string is a parseable float	if the string is empty, `False`, `True` otherwise	*

How do I find out ... ?

Python Documentation Here are links to some useful pages that will help you learn Python.

Python builtin types page Documentation on both scalar and containter types can be found here.
Python builtin functions page This is organized alphbetically. Visit this page from time to time, pick out something that looks interesting or something at random, and learn how to use it.

String Varieties

Special Characters

\n This is a newline character.
\t This is a tab.
\r This is a tab (Windoze uses this).
\\ This is a whack.
\xYY This prints out the character whose ascii value is YY in hex.
\xYYYY This prints out the character whose unicode value is YYYY in hex.

Format Strings

Raw Strings

Triple-Quoted Strings

Make us!

*
**
***
****
*****

    *
   ***
  *****
 *******
*********

     *
    * *
   * * *
  * * * *
 * * * * *
* * * * * *
    * *
    * *

Using input