Python Built In Functions

Namya ShahNamya Shah
8 min read

  1. abs()

     # Returns the absolute value of a number
 x = abs(-7.25)
 print(x)
 # OUTPUT
 # 7.25

  2. all()

     # Returns True if all items in an iterable object are true
 mylist = [True, True, True]
 x = all(mylist)
 print(x)
 # OUTPUT
 # True

  3. any()

     # Returns True if any item in an iterable object is true
 mylist = [False, True, False]
 x = any(mylist)
 print(x)
 # OUTPUT
 # True

  4. ascii()

     # Returns a readable version of an object. Replaces none-ascii characters with escape character
 x = ascii("My name is Ståle")
 print(x)
 # OUTPUT
 # 'My name is St\e5le'

  5. bin()

     # Returns the binary version of a number
 x = bin(36)
 print(x)
 # OUTPUT
 # 0b100100

  6. bool()

     # Returns the boolean value of the specified object
 x = bool(1)
 print(x)
 # OUTPUT
 # True

  7. bytearray()

     # Returns an array of bytes
 x = bytearray(4)
 print(x)
 # OUTPUT
 # bytearray(b'\x00\x00\x00\x00')

  8. bytes()

     # Returns a bytes object
 x = bytes(4)
 print(x)
 # OUTPUT
 # b'\x00\x00\x00\x00'

  9. callable()

     # Returns True if the specified object is callable, otherwise False
 def x():
   a = 5
 print(callable(x))
 # OUTPUT
 # True

  10. chr()

    # Returns a character from the specified Unicode code.
x = chr(97)
print(x)
# OUTPUT
# a

  11. classmethod()

    # Converts a method into a class method

  12. compile()

    # Returns the specified source as an object, ready to be executed
x = compile('print(55)', 'test', 'eval')
exec(x)
# OUTPUT
# 55

  13. complex()

    # Returns a complex number
x = complex(3, 5)
print(x)
# OUTPUT
# (3+5j)

  14. delattr()

    # Deletes the specified attribute (property or method) from the specified object
class Person:
  name = "John"
  age = 36
  country = "Norway"
delattr(Person, 'age')
print(x)
# OUTPUT
# The Person object will no longer contain an "age" property

  15. dict()

    # Returns a dictionary (Array)
x = dict(name = "John", age = 36, country = "Norway")
print(x)
# OUTPUT
# {'name': 'John', 'age': 36, 'country': 'Norway'}

  16. dir()

    # Returns a list of the specified object's properties and methods
class Person:
  name = "John"
  age = 36
  country = "Norway"
print(dir(Person))
# OUTPUT
# ['__class__', '__delattr__', '__dict__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__gt__', '__hash__', '__init__', '__init_subclass__', '__le__', '__lt__', '__module__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', 'age', 'country', 'name']

  17. divmod()

    # Returns the quotient and the remainder when argument1 is divided by argument2
x = divmod(5, 2)
print(x)
# OUTPUT
# (2, 1)

  18. enumerate()

    # Takes a collection (e.g. a tuple) and returns it as an enumerate object
x = ('apple', 'banana', 'cherry')
y = enumerate(x)
# OUTPUT
# [(0, 'apple'), (1, 'banana'), (2, 'cherry')]

  19. eval()

    # Evaluates and executes an expression
x = 'print(55)'
eval(x)
# OUTPUT
# 55

  20. exec()

    # Executes the specified code (or object)
x = 'name = "John"\nprint(name)'
exec(x)
# OUTPUT
# John

  21. filter()

    # Use a filter function to exclude items in an iterable object
ages = [5, 12, 17, 18, 24, 32]

def myFunc(x):
  if x < 18:
    return False
  else:
    return True

adults = filter(myFunc, ages)

for x in adults:
  print(x)

# OUTPUT
# 18
# 24
# 32

  22. float()

    # Returns a floating point number
x = float(3)
print(x)
# OUTPUT
# 3.0

  23. format()

    # Format the number 0.5 into a percentage value
x = format(0.5, '%')
print(x)
# OUTPUT
# 50.000000%

  24. frozenset()

    # Returns a frozenset object
mylist = ['apple', 'banana', 'cherry']
x = frozenset(mylist)
print(x)
# OUTPUT
# frozenset({'banana', 'cherry', 'apple'})

  25. getattr()

    # Returns the value of the specified attribute (property or method)
class Person:
  name = "John"
  age = 36
  country = "Norway"
x = getattr(Person, 'age')
print(x)
# OUTPUT
# 36

  26. globals()

    # Returns the current global symbol table as a dictionary
x = globals()
print(x)
# OUTPUT
# {'__name__': '__main__', '__doc__': None, '__package__': None, '__loader__': <_frozen_importlib_external.SourceFileLoader object at 0x02A8C2D0>, '__spec__': None, '__annotations__': {}, '__builtins__': <module 'builtins' (built-in)>, '__file__': 'demo_ref_globals.py', '__cached__': None, 'x'_ {...}}

  27. hasattr()

    # Returns True if the specified object has the specified attribute (property/method)
class Person:
  name = "John"
  age = 36
  country = "Norway"

x = hasattr(Person, 'age')
print(x)
# OUTPUT
# True

  28. hash()

    # Returns the hash value of a specified object

  29. help()

    # Executes the built-in help system

  30. hex()

    # Converts a number into a hexadecimal value
x = hex(255)
print(x)
# OUTPUT
# 0xff

  31. id()

    # Returns the id of an object
x = ('apple', 'banana', 'cherry')
y = id(x)
# OUTPUT
# 75686015

  32. input()

    # Allowing user input
print('Enter your name:')
x = input()
print('Hello, ' + x)
# OUTPUT
# Hello, x

  33. int()

    # Returns an integer number
x = int(3.5)
print(x)
# OUTPUT
# 3

  34. isinstance()

    # Returns True if a specified object is an instance of a specified object
x = isinstance(5, int)
# OUTPUT
# True

  35. issubclass()

    # Returns True if a specified class is a subclass of a specified object
print(x)

  36. iter()

    # Returns an iterator object
print(x)

  37. len()

    # Returns the length of an object
mylist = ["apple", "banana", "cherry"]
x = len(mylist)
print(x)
# OUTPUT
# 3

  38. list()

    # Returns a list
x = list(('apple', 'banana', 'cherry'))
print(x)
# OUTPUT
# ['apple', banana', 'cherry']

  39. locals()

    # Returns an updated dictionary of the current local symbol table
x = locals()
print(x)
# OUTPUT
# {'__name__': '__main__', '__doc__': None, '__package__': None, '__loader__': <_frozen_importlib_external.SourceFileLoader object at 0x0327C2D0>, '__spec__': None, '__annotations__': {}, '__builtins__': <module 'builtins' (built-in)>, '__file__': 'demo_ref_globals.py', '__cached__': None, 'x'_ {...}}

  40. map()

    # Returns the specified iterator with the specified function applied to each item
def myfunc(n):
  return len(n)

x = map(myfunc, ('apple', 'banana', 'cherry'))
print(x)
# OUTPUT
# <map object at 0x056D44F0>
# [5, 6, 6]

  41. max()

    # Returns the largest item in an iterable
x = max(5, 10)
print(x)
# OUTPUT
# 10

  42. memoryview()

    # Returns a memory view object
x = memoryview(b"Hello")

print(x)

#return the Unicode of the first character
print(x[0])

#return the Unicode of the second character
print(x[1])
# OUTPUT
# <memory at 0x03348FA0>
# 72
# 101

  43. min()

    # Returns the smallest item in an iterable
x = min(5, 10)
print(x)
# OUTPUT
# 5

  44. next()

    # Returns the next item in an iterable
mylist = iter(["apple", "banana", "cherry"])
x = next(mylist)
print(x)
x = next(mylist)
print(x)
x = next(mylist)
print(x)
# OUTPUT
# apple
# banana
# cherry

  45. object()

    # Returns a new object
x = object()
print(x)
# OUTPUT
# <object object at 0x14ba79ea9d70>

  46. oct()

    # Converts a number into an octal
x = oct(12)
print(x)
# OUTPUT
# 0o14

  47. open()

    # Opens a file and returns a file object
f = open("demofile.txt", "r")
print(f.read())
# OUTPUT
# Hello! Welcome to demofile.txt
# This file is for testing purposes.
# Good Luck!

  48. ord()

    # Convert an integer representing the Unicode of the specified character
x = ord("h")
print(x)
# OUTPUT
# 104

  49. pow()

    # Returns the value of x to the power of y
x = pow(4, 3)
print(x)
# OUTPUT
# 64

  50. print()

    # Prints to the standard output device
print("Hello World")
# OUTPUT
# Hello World

  51. property()

    # Gets, sets, deletes a property

  52. range()

    # Returns a sequence of numbers, starting from 0 and increments by 1 (by default)
x = range(6)
for n in x:
  print(n)
# OUTPUT
# 0
# 1
# 2
# 3
# 4
# 5

  53. repr()

    # Returns a readable version of an object

  54. reversed()

    # Returns a reversed iterator
alph = ["a", "b", "c", "d"]
ralph = reversed(alph)
for x in ralph:
  print(x)
# OUTPUT
# d
# c
# b
# a

  55. round()

    # Rounds a numbers
x = round(5.76543, 2)
print(x)
# OUTPUT
# 5.76

  56. set()

    # Returns a new set object
x = set(('apple', 'banana', 'cherry'))
print(x)
# OUTPUT
# {'apple', 'banana', 'cherry'}

  57. setattr()

    # Sets an attribute (property/method) of an object
class Person:
  name = "John"
  age = 36
  country = "Norway"

setattr(Person, 'age', 40)
# OUTPUT
# 40

  58. slice()

    # Returns a slice object
a = ("a", "b", "c", "d", "e", "f", "g", "h")
x = slice(2)
print(a[x])
# OUTPUT
# ('a', 'b')

  59. sorted()

    # Returns a sorted list
a = ("b", "g", "a", "d", "f", "c", "h", "e")
x = sorted(a)
print(x)
# OUTPUT
# ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h']

  60. staticmethod()

    # Converts a method into a static method

  61. str()

    # Returns a string object
x = str(3.5)
print(x)
# OUTPUT
# "3.5"

  62. sum()

    # Sums the items of an iterator
a = (1, 2, 3, 4, 5)
x = sum(a)
print(x)
# OUTPUT
# 15

  63. super()

    # Returns an object that represents the parent class
class Parent:
  def __init__(self, txt):
    self.message = txt

  def printmessage(self):
    print(self.message)

class Child(Parent):
  def __init__(self, txt):
    super().__init__(txt)

x = Child("Hello, and welcome!")

x.printmessage()
# OUTPUT
# Hello, and welcome!

  64. tuple()

    # Returns a tuple
x = tuple(("apple", "banana", "cherry"))
print(x)
# OUTPUT
# ('banana', 'cherry', 'apple')

  65. type()

    # Returns the type of an object
a = ('apple', 'banana', 'cherry')
b = "Hello World"
c = 33

x = type(a)
y = type(b)
z = type(c)
# OUTPUT
# tuple
# str
# int

  66. vars()

    # Returns the __dict__ property of an object
class Person:
  name = "John"
  age = 36
  country = "norway"

x = vars(Person)
print(x)
# OUTPUT
# {'__module__': '__main__', 'name': 'John', 'age': 36, 'country': 'norway', '__dict__': <attribute '__dict__' of 'Person' objects>, '__weakref__': <attribute '__weakref__' of 'Person' objects>, '__doc__': None}

  67. zip()

      # Returns an iterator, from two or more iterators
  a = ("John", "Charles", "Mike")
  b = ("Jenny", "Christy", "Monica")

  x = zip(a, b)
  print(x)
  # OUTPUT
  # (('John', 'Jenny'), ('Charles', 'Christy'), ('Mike', 'Monica'))
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PythonPython 3floatbuilt in functionsabs

Written by

Namya Shah
Namya Shah

I am a developer who is very enthusiast about technology and coding.