0x09-python-everything_is_object

Python - Everything is object

In this project, I studied object instantiation in Python, delving into variable aliasing and object identifiers, types, and mutability. The project involved a series of quiz-like questions the answers to which I provided in single-line .txt files.

Tests ✔️

• tests: Folder of test files.

Tasks 📃

• 0. Who am I?

  • 0-answer.txt: What function would you use to print the type of an object?

• 1. Where are you?

  • 1-answer.txt: How do you get a variable's identifier (which is the memory address in the CPython implementation)?

• 2. Right count

  • 2-answer.txt: In the following code, do a and b point to the same object?

>>> a = 89
>>> b = 100

• 3. Right count =
  • 3-answer.txt: In the following code, do a and b point to the same object?

>>> a = 89
>>> b = 89

• 4. Right count =
  • 4-answer.txt: In the following code, do a and b point to the same object?

>>> a = 89
>>> b = a

• 5. Right count =+
  • 5-answer.txt: In the following code, do a and b point to the same object?

>>> a = 89
>>> b = a + 1

• 6. Is equal
  • 6-answer.txt: What do these 3 lines print?

>>> s1 = "Best School"
>>> s2 = s1
>>> print(s1 == s2)

• 7. Is the same
  • 7-answer.txt: What do these 3 lines print?

>>> s1 = "Best"
>>> s2 = s1
>>> print(s1 is s2)

• 8. Is really equal
  • 8-answer.txt: What do these 3 lines print?

>>> s1 = "Best School"
>>> s2 = "Best School"
>>> print(s1 == s2)

• 9. Is really the same
  • 9-answer.txt: What do these 3 lines print?

>>> s1 = "Best School"
>>> s2 = "Best School"
>>> print(s1 is s2)

• 10. And with a list, is it equal
  • 10-answer.txt: What do these 3 lines print?

>>> l1 = [1, 2, 3]
>>> l2 = [1, 2, 3]
>>> print(l1 == l2)

• 11. And with a list, is it the same
  • 11-answer.txt: What do these 3 lines print?

>>> l1 = [1, 2, 3]
>>> l2 = [1, 2, 3]
>>> print(l1 is l2)

• 12. And with a list, is it really equal
  • 12-answer.txt: What do these 3 lines print?

>>> l1 = [1, 2, 3]
>>> l2 = l1
>>> print(l1 == l2)

• 13. And with a list, is it really the same
  • 13-answer.txt: What do these 3 lines print?

>>> l1 = [1, 2, 3]
>>> l2 = l1
>>> print(l1 is l2)

• 14. List append
  • 14-answer.txt: What does this script print?

l1 = [1, 2, 3]
l2 = l1
l1.append(4)
print(l2)

• 15. List add
  • 15-answer.txt: What does this script print?

l1 = [1, 2, 3]
l2 = l1
l1 = l1 + [4]
print(l2)

• 16. Integer incrementation
  • 16-answer.txt: What does this script print?

def increment(n):
    n += 1

a = 1
increment(a)
print(a)

• 17. List incrementation
  • 17-answer.txt: What does this script print?

def increment(n):
    n.append(4)

l = [1, 2, 3]
increment(l)
print(l)

• 18. List assignation
  • 18-answer.txt: What does this script print?

def assign_value(n, v):
    n = v

l1 = [1, 2, 3]
l2 = [4, 5, 6]
assign_value(l1, l2)
print(l1)

• 19. Copy a list object

  • 19-copy_list.py: Python function def copy_list(l): that returns a copy of a list.

• 20. Tuple or not?

  • 20-answer.txt: Is a a tuple?

a = ()

• 21. Tuple or not?
• 21-answer.txt: Is a a tuple?

a = (1, 2)

• 22. Tuple or not?
  • 22-answer.txt: Is a a tuple?

a = (1)

• 23. Tuple or not?
  • 23-answer.txt: Is a a tuple?

a = (1, )

• 24. Who I am?
  • 24-answer.txt: What does this script print?

a = (1)
b = (1)
a is b

• 25. Tuple or not
  • 25-answer.txt: What does this script print?

a = (1, 2)
b = (1, 2)
a is b

• 26. Empty is not empty
  • 26-answer.txt: What does this script print?

a = ()
b = ()
a is b

• 27. Still the same
  • 27-answer.txt: Will the last line of this script print 139926795932424?

>>> id(a)
139926795932424
>>> a
[1, 2, 3, 4]
>>> a = a + [5]
>>> id(a)

• 28. Same or not?
  • 28-answer.txt: Will the last line of this script print 139926795932424?

>>> a
[1, 2, 3]
>>> id (a)
139926795932424
>>> a += [4]
>>> id(a)

• 29. #pythonic

  • 100-magic_string.py: Python function magic_string() that returns the string "BestSchool" n times the number of iteration.

• 30. Low memory cost

  • 101-locked_class.py: Python class LockedClass with no attributes that prevents the user from dynamically creating any new instance attributes not called first_name.

• 31. int 1/3

  • 103-line1.txt: How many int objects are created by the execution of the first line in this script?
  • 104-line2.txt: How many int objects are created by the execution of the second line in this script?

a = 1
b = 1

• 32. int 2/3
  • 104-line1.txt: How many int objects are created by the execution of the first line in this script?
  • 104-line2.txt: How many int objects are created by the execution of the second line in this script?
  • 104-line3.txt: After the execution of line 3, is the int object pointed to by a deleted?
  • 104-line4.txt: After the execution of line 4, is the int object pointed to by b deleted?
  • 104-line5.txt: How many int objects are created by the execution of the last line in this script?

a = 1024
b = 1024
del a
del b
c = 1024

• 33. int 3/3
  • 105-line1.txt: Before the execution of line 2 in this script, how many int objects have been created and are still in memory?

print("I")
print("Love")
print("Python")

• 34. Clear strings
  • 106-line1.txt: How many str objects are created by the execution of the first line in this script?
  • 106-line2.txt: How many str objects are created by the execution of the second line in this script?
  • 106-line3.txt: After the execution of line 3, is the str object pointed to by a deleted?
  • 106-line4.txt: After the execution of line 4, is the str object pointed to by b deleted?
  • 106-line5.txt: How many str objects are created by the execution of the last line in this script?

a = "SCHL"
b = "SCHL"
del a
del b
c = "SCHL"