Py4E DB

Question 1

Name 4 different charactersets, what in short are their differences, and name which one is most commonly used

Answer 1

ASCII (128 chars), UTF32, UTF16, UTF8-most commonly used. UTF32 uses 4 bytes, UTF16 2 bytes, UTF8 only 1 byte - reason why it’s used

Question 2

which char.set is used internally by Python 3?

is there anything not being stored in that char.set?

Answer 2

Unicode

binary charset, own defined: ]] y = b’aaa’

Question 3

With what function can you find the ASCII-number for a character?

Answer 3

]] ord( ‘a’ )

]] print( ord( ‘a’ ) )

Question 4

What function is used to convert characters from outside sources?
And what does it do?

Answer 4

]] mystring = outside_db.recfv(512)
]] mystring.decode()
- it will move the data from byte to unicode

Question 5

how to make a string into bytes?

Answer 5

]] < string >.encode()

from string of characters into bytes

Question 6

in which direction are the 2 functions used?

Answer 6

decode() - data received

encode() - data sent

Question 7

what is a class?

Answer 7

A family of a specific kind of objects sharing the same attributes

Question 8

how can you list all functions available to a class?

Answer 8

]] L = list(), ]] D = dict(), ]] T = tuple()

]] dict(L), ]] dict(D), ]] dict(T)

Question 9

Obj.prog.: what is a constructor?

Answer 9

An object at the time when initially constructed

Question 10

What are the definitions for: Class, Method or Message, Field or Attribute, Object or Instance

Answer 10

Class - a template,
Method or Message - defined Class’ capability,
Field or Attribute - bit of data in a Class,
Object or Instance - an instance of a Class