Check if a number is int or float

Question

Here's how I did it:

inNumber = somenumber
inNumberint = int(inNumber)
if inNumber == inNumberint:
    print "this number is an int"
else:
    print "this number is a float"

Something like that.
Are there any nicer looking ways to do this?

Answer 1

Use isinstance.

>>> x = 12
>>> isinstance(x, int)
True
>>> y = 12.0
>>> isinstance(y, float)
True

So:

>>> if isinstance(x, int):
        print('x is a int!')

x is a int!

In case of long integers, the above won't work. So you need to do:

>>> x = 12L
>>> import numbers
>>> isinstance(x, numbers.Integral)
True
>>> isinstance(x, int)
False

Answer 2

I like @ninjagecko's answer the most.

This would also work:

for Python 2.x

isinstance(n, (int, long, float)) 

Python 3.x doesn't have long

isinstance(n, (int, float))

there is also type complex for complex numbers

Answer 3

(note: this will return True for type bool, at least in cpython, which may not be what you want. Thank you commenters.)

One-liner:

isinstance(yourNumber, numbers.Real)

This avoids some problems:

>>> isinstance(99**10,int)
False

Demo:

>>> import numbers

>>> someInt = 10
>>> someLongInt = 100000L
>>> someFloat = 0.5

>>> isinstance(someInt, numbers.Real)
True
>>> isinstance(someLongInt, numbers.Real)
True
>>> isinstance(someFloat, numbers.Real)
True

Answer 4

You can use modulo to determine if x is an integer numerically. The isinstance(x, int) method only determines if x is an integer by type:

def isInt(x):
    if x%1 == 0:
        print "X is an integer"
    else:
        print "X is not an integer"

Answer 5

It's easier to ask forgiveness than ask permission. Simply perform the operation. If it works, the object was of an acceptable, suitable, proper type. If the operation doesn't work, the object was not of a suitable type. Knowing the type rarely helps.

Simply attempt the operation and see if it works.

inNumber = somenumber
try:
    inNumberint = int(inNumber)
    print "this number is an int"
except ValueError:
    pass
try:
    inNumberfloat = float(inNumber)
    print "this number is a float"
except ValueError:
    pass

Answer 6

What you can do too is usingtype() Example:

if type(inNumber) == int : print "This number is an int"
elif type(inNumber) == float : print "This number is a float"

Answer 7

Tried in Python version 3.6.3 Shell

>>> x = 12
>>> import numbers
>>> isinstance(x, numbers.Integral)
True
>>> isinstance(x,int)
True

Couldn't figure out anything to work for.

Answer 8

Here's a piece of code that checks whether a number is an integer or not, it works for both Python 2 and Python 3.

import sys

if sys.version < '3':
    integer_types = (int, long,)
else:
    integer_types = (int,)

isinstance(yourNumber, integer_types)  # returns True if it's an integer
isinstance(yourNumber, float)  # returns True if it's a float

Notice that Python 2 has both types int and long, while Python 3 has only type int. Source.

If you want to check whether your number is a float that represents an int, do this

(isinstance(yourNumber, float) and (yourNumber).is_integer())  # True for 3.0

If you don't need to distinguish between int and float, and are ok with either, then ninjagecko's answer is the way to go

import numbers

isinstance(yourNumber, numbers.Real)

Answer 9

how about this solution?

if type(x) in (float, int):
    # do whatever
else:
    # do whatever

Answer 10

I know it's an old thread but this is something that I'm using and I thought it might help.

It works in python 2.7 and python 3< .

def is_float(num):
    """
    Checks whether a number is float or integer

    Args:
        num(float or int): The number to check

    Returns:
        True if the number is float
    """
    return not (float(num)).is_integer()


class TestIsFloat(unittest.TestCase):
    def test_float(self):
        self.assertTrue(is_float(2.2))

    def test_int(self):
        self.assertFalse(is_float(2))

Answer 11

I am not sure why this hasn't been proposed before, but how about using the built-in Python method on a float called is_integer()? Basically you could give it some number cast as a float, and ask whether it is an integer or not. For instance:

>>> (-13.0).is_integer()
True

>>> (3.14).is_integer()
False

For completeness, however, consider:

isinstance(i, int) or i.is_integer()

Answer 12

pls check this: import numbers

import math

a = 1.1 - 0.1
print a 

print isinstance(a, numbers.Integral)
print math.floor( a )
if (math.floor( a ) == a):
    print "It is an integer number"
else:
    print False

Although X is float but the value is integer, so if you want to check the value is integer you cannot use isinstance and you need to compare values not types.

Answer 13

You can do it with simple if statement

To check for float

if type(a)==type(1.1)

To check for integer type

if type(a)==type(1)

Answer 14

absolute = abs(x)
rounded = round(absolute)
if absolute - rounded == 0:
  print 'Integer number'
else:
  print 'notInteger number'

Answer 15

Update: Try this

inNumber = [32, 12.5, 'e', 82, 52, 92, '1224.5', '12,53',
            10000.000, '10,000459', 
           'This is a sentance, with comma number 1 and dot.', '121.124']

try:

    def find_float(num):
        num = num.split('.')
        if num[-1] is not None and num[-1].isdigit():
            return True
        else:
            return False

    for i in inNumber:
        i = str(i).replace(',', '.')
        if '.' in i and find_float(i):
            print('This is float', i)
        elif i.isnumeric():
            print('This is an integer', i)
        else:
            print('This is not a number ?', i)

except Exception as err:
    print(err)

Answer 16

Use the most basic of type inference that python has:

>>> # Float Check
>>> myNumber = 2.56
>>> print(type(myNumber) == int)
False
>>> print(type(myNumber) == float)
True
>>> print(type(myNumber) == bool)
False
>>>
>>> # Integer Check
>>> myNumber = 2
>>> print(type(myNumber) == int)
True
>>> print(type(myNumber) == float)
False
>>> print(type(myNumber) == bool)
False
>>>
>>> # Boolean Check
>>> myNumber = False
>>> print(type(myNumber) == int)
False
>>> print(type(myNumber) == float)
False
>>> print(type(myNumber) == bool)
True
>>>

Easiest and Most Resilient Approach in my Opinion

Answer 17

def is_int(x):
  absolute = abs(x)
  rounded = round(absolute)
  if absolute - rounded == 0:
    print str(x) + " is an integer"
  else:
    print str(x) +" is not an integer"


is_int(7.0) # will print 7.0 is an integer

Answer 18

Try this...

def is_int(x):
  absolute = abs(x)
  rounded = round(absolute)
  return absolute - rounded == 0

Answer 19

variable.isnumeric checks if a value is an integer:

 if myVariable.isnumeric:
    print('this varibale is numeric')
 else:
    print('not numeric')