In this article, we will discuss important built-in function in Python 3.
type() function in Python
Role of type() Function:
The type() returns the type of an object
Syntax:
type(object)
Code:
a_string = "I am a string" a_integer = 3 a_float = 5.9 a_complex = 3 + 4j a_list = [1, 2, 3, 4] print(type(a_string)) print(type(a_integer)) print(type(a_float)) print(type(a_complex)) print(type(a_list))
Output:
<class 'str'> <class 'int'> <class 'float'> <class 'complex'> <class 'list'>
abs() function in Python
Role of abs() Function:
The abs() function is used to return the absolute value of a number.
Syntax:
abs(number) number : Can be integer, a floating point number or a complex number
Code:
# Floating point number
x_float = -101.89
print('Absolute value of float is:', abs(x_float))
# Integer Number
y_int = -61
print('Absolute value of integer is:', abs(y_int))
# Complex number
z_complex = (-4 - 3j)
print('Absolute value or Magnitude of complex is:', abs(z_complex))
Output:
Absolute value of float is: 101.89 Absolute value of integer is: 61 Absolute value or Magnitude of complex is: 5.0
all () function in Python
Role of all() Function:
The all() function returns True if all items in an iterable object are true
Syntax:
all(object) object can be a list
Code:
x = [False, True, True, True, True] print(all(x)) x = [True, True, True, True, True] print(all(x))
Output:
False True
any () function in Python
Role of any() Function:
The any() function returns True if any item in an iterable object is true
Syntax:
any(object) object can be a list
Code:
x = [False, True, True, True, True] print(any(x)) x = [True, True, True, True, True] print(any(x))
Output:
True True
bin () function in Python
Role of bin() Function:
The bin() function returns the binary version of a number
Syntax:
bin(number) object can be a list
Code:
x = 32 print(bin(x)) y = 255 print(bin(y))
Output:
0b100000 0b11111111
bool () function in Python
Role of bool() Function:
The bool() function returns the boolean value of the specified object
Code:
print(bool(3 < 5)) print(bool(3 == 5))
Output:
True False
float () function in Python
Role of float() Function:
The float() function returns the float value
Code:
a = input("Enter a Float number: ")
if type(a) == float:
print("Entered number is not float")
else:
print("Entered Number is {}".format(type(a)))
print("Let's convert string type to float type")
a = float(a)
if type(a) == float:
print("String Type is finally converted to float")
Output:
Enter a Float number: 3.0 Entered Number is <class 'str'> Let's convert string type to float type String Type is finally converted to float
int () function in Python
Role of int() Function:
The int() function returns the integer value
Code:
a = input("Enter a Integer number: ")
if type(a) == float:
print("Entered number is not Integer")
else:
print("Entered Number is {}".format(type(a)))
print("Let's convert string type to Integer type")
a = float(a)
if type(a) == float:
print("String Type is finally converted to Integer")
Output:
Enter a Integer number: 3 Entered Number is <class 'str'> Let's convert string type to Integer type String Type is finally converted to Integer
str () function in Python
Role of str() Function:
The str() function returns the string data type
Code:
a_string = "I am a string" a_integer = 3 a_float = 5.9 a_complex = 3 + 4j a_list = [1, 2, 3, 4] print(type(str(a_string))) print(type(str(a_integer))) print(type(str(a_float))) print(type(str(a_complex))) print(type(str(a_list)))
Output:
<class 'str'> <class 'str'> <class 'str'> <class 'str'> <class 'str'>
len () function in Python
Role of len() Function:
The len() function returns the length of an object
Code:
a = input("Enter some Text: ")
print("The length of the text entered is: {} ".format(len(a)))
a_list = ["I", "am", "a", "Python", "Programmer"]
print("The length of the list is: {} ".format(len(a_list)))
Output:
Enter some Text: I am a Python Programmer The length of the text entered is: 24 The length of the list is: 5
list () function in Python
Role of list() Function:
The list() function returns a list
Code:
a = input("Enter some Text: ")
print("Now we will convert the text in to list: ")
a = list(a)
print(a)
Output:
Enter some Text: Python Now we will convert the text in to list: ['P', 'y', 't', 'h', 'o', 'n']
sorted () function in Python
Role of sorted() Function:
The sorted() function returns a sorted list
Code:
a = [5, 104, 109, -1, 12, 3]
print("Printing the sorted list: ")
print(sorted(a))
Output:
Printing the sorted list: [-1, 3, 5, 12, 104, 109]
reversed () function in Python
Role of reversed() Function:
The reversed() function returns a reversed iterator
Code:
a = [5, 104, 109, -1, 12, 3]
a_iterator = reversed(a)
a = list(a_iterator)
print("Printing the reversed list: ")
print(list(a))
Output:
Printing the reversed list: [3, 12, -1, 109, 104, 5]
round () function in Python
Role of round() Function:
The round() function returns a round value
Code:
print(round(3.5)) print(round(-3.48)) print(round(5.19)) print(round(7.9))
Output:
4 -3 5 8
iter () function in Python
Role of iter() Function:
The iter() function returns an iterator object
Code:
a = iter([5, 4, 3, 2, 1])
print(a)
print("We will pass the list_iterator object to sort the list ")
b = sorted(a)
print("Sorted List is: ")
print(b)
Output:
<list_iterator object at 0x000001B9CC263208> We will pass the list_iterator object to sort the list Sorted List is: [1, 2, 3, 4, 5]
next () function in Python
Role of next() Function:
The next() function returns the next item in an iterable
Code:
a_list = [5, 4, 3, 2, 1]
a_iter = iter(a_list)
a_length = len(a_list)
print("Length of the list is: {}".format(a_length))
print("We will run the for loop {} times".format(a_length))
for i in range(0,a_length):
print(next(a_iter))
Output:
Length of the list is: 5 We will run the for loop 5 times 5 4 3 2 1
range () function in Python
Role of range() Function:
The range() function returns a sequence of numbers, starting from 0 and increments by 1 (by default)
Code:
a_list = [5, 4, 3, 2, 1]
a_length = len(a_list)
a_iter = iter(a_list)
print("Length of the list is: {}".format(a_length))
print("We will run the for loop {} times".format(a_length))
for i in range(0,a_length):
print(next(a_iter))
#Default increment value is 1 in range function
#Now we will change the increment/step value to 3
for i in range(0, 15, 3):
print("Value of i is {}".format(i))
Output:
Length of the list is: 5 We will run the for loop 5 times 5 4 3 2 1 Value of i is 0 Value of i is 3 Value of i is 6 Value of i is 9 Value of i is 12
sum () function in Python
Role of sum() Function:
The sum() function sums the items of an iterator
Code:
a_list = [5, 4, 3, 2, 1]
print("Sum of all integers in the list is: {}".format(sum(a_list)))
Output:
Sum of all integers in the list is: 15
min () function in Python
Role of min() Function:
The min() function returns the smallest item in an iterable
Code:
a_list = [5, 4, 3, 2, 1]
print("Minimum of all integers in the list is: {}".format(min(a_list)))
Output:
Minimum of all integers in the list is: 1
max () function in Python
Role of max() Function:
The max() function returns the largest item in an iterable
Code:
a_list = [5, 4, 3, 2, 1]
print("Largest of all integers in the list is: {}".format(max(a_list)))
Output:
Largest of all integers in the list is: 5
