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# Built-in Functions in Python

## Built in Function

Built in functions are the function(s) that are built into Python and can be accessed by a programmer. These are always available and for using them, we don’t have to import any module (file). Python has a small set of built-in functions as most of the functions have been partitioned to modules. This was done to keep core language precise.

Definition:

The Python interpreter has a number of functions that are always available for use. These functions are called built-in functions.

For example,

print() function prints the given object to the standard output device (screen) or to the text stream file.

## Built in Function

### abs (x)

It returns distance between x and zero, where x is a numeric expression.

>>>abs(-45)

45

>>>abs(119L)

119

### max( x, y, z, …. )

It returns the largest of its  arguments: where x, y and z are numeric variable or expression.

>>>max(80, 100, 1000)

1000

>>>max(-80, -20, -10)

-10

### min( x, y, z, …. )

It returns the largest of its arguments: where x, y and z are numeric variable or expression.

>>> min(80, 100, 1000)

80

>>> min(-80, -20, -10)

-80

### cmp( x, y )

It returns the sign of the difference of two numbers: -1 if x < y, 0 if x == y, or 1 if x > y, where x and y are numeric variable/expression.

>>>cmp(80, 100)

-1

>>>cmp(180, 100)

1

### divmod (x,y )

Returns both quotient and remainder by division through a tuple, when x is divided by y; where x & y are variable/expression.

>>> divmod (14,5)

(2,4)

>>> divmod (2.7, 1.5)

(1.0, 1.20000)

### len (s)

Return the length

>>> a= [1,2,3]

>>>len (a)

3

>>> b= “Hello‟

>>> len (b)

5

### range (start, stop[,step])

The arguments must be plain integers. If the step argument is omitted, it defaults to 1. If the start argument is omitted, it defaults to 0.

>>> range(10)

[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

>>> range(1, 11)

[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

>>> range(0, 30, 5)

[0, 5, 10, 15, 20, 25]

### round( x [, n] )

It returns float x rounded to n digits from the decimal point, where x and n are numeric expressions.

If n is not provided then x is rounded to 0 decimal digits.

>>>round(80.23456, 2)

80.23

>>>round(-100.000056, 3)

-100.0

>>> round (80.23456)

80.0

### Type Conversion Functions

int( ) – To convert the string into integer.

str( ) – To covert any value into string.

float( ) – To covert string into float.

>> print 10 + int(“20”)

>> str(10)

>>float(10)

### Input Functions

This function is used to take input from user in the form of string.

Name =input(“Enter your name : “)

### eval function:

This function is used to evaluate the value of the string

e.g. x=eval(“45+10“)

print(x)

FunctionDescription
abs()Returns the absolute value of a number
all()Returns True if all items in an iterable object are true
any()Returns True if any item in an iterable object is true
ascii()Returns a readable version of an object. Replaces none-ascii characters with escape character
bin()Returns the binary version of a number
bool()Returns the boolean value of the specified object
bytearray()Returns an array of bytes
bytes()Returns a bytes object
callable()Returns True if the specified object is callable, otherwise False
chr()Returns a character from the specified Unicode code.
classmethod()Converts a method into a class method
compile()Returns the specified source as an object, ready to be executed
complex()Returns a complex number
delattr()Deletes the specified attribute (property or method) from the specified object
dict()Returns a dictionary (Array)
dir()Returns a list of the specified object’s properties and methods
divmod()Returns the quotient and the remainder when argument1 is divided by argument2
enumerate()Takes a collection (e.g. a tuple) and returns it as an enumerate object
eval()Evaluates and executes an expression
exec()Executes the specified code (or object)
filter()Use a filter function to exclude items in an iterable object
float()Returns a floating point number
format()Formats a specified value
frozenset()Returns a frozenset object
getattr()Returns the value of the specified attribute (property or method)
globals()Returns the current global symbol table as a dictionary
hasattr()Returns True if the specified object has the specified attribute (property/method)
hash()Returns the hash value of a specified object
help()Executes the built-in help system
hex()Converts a number into a hexadecimal value
id()Returns the id of an object
input()Allowing user input
int()Returns an integer number
isinstance()Returns True if a specified object is an instance of a specified object
issubclass()Returns True if a specified class is a subclass of a specified object
iter()Returns an iterator object
len()Returns the length of an object
list()Returns a list
locals()Returns an updated dictionary of the current local symbol table
map()Returns the specified iterator with the specified function applied to each item
max()Returns the largest item in an iterable
memoryview()Returns a memory view object
min()Returns the smallest item in an iterable
next()Returns the next item in an iterable
object()Returns a new object
oct()Converts a number into an octal
open()Opens a file and returns a file object
ord()Convert an integer representing the Unicode of the specified character
pow()Returns the value of x to the power of y
print()Prints to the standard output device
property()Gets, sets, deletes a property
range()Returns a sequence of numbers, starting from 0 and increments by 1 (by default)
repr()Returns a readable version of an object
reversed()Returns a reversed iterator
round()Rounds a numbers
set()Returns a new set object
setattr()Sets an attribute (property/method) of an object
slice()Returns a slice object
sorted()Returns a sorted list
staticmethod()Converts a method into a static method
str()Returns a string object
sum()Sums the items of an iterator
super()Returns an object that represents the parent class
tuple()Returns a tuple
type()Returns the type of an object
vars()Returns the __dict__ property of an object
zip()

Returns an iterator, from two or more iterators

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