How to check whether an object is string or integer in python. Also using if... else... to determine them

Question

I created an input() command and now i want to know whether the input is str or int. I will use if... and else... statement to print (something) if input id int and print(anything) if it's a string.

How can I do it ?
Could anybody tell it.
Plzzzzzz...🙏🙏🙏

Answer 1

Hello.
input function always returns a string of what user has typed, but you can make the program to check, whether each character user typed is valid to be an integer.

You can test it with 2 easy ways, when x = input().
condition variable will be True if x is integer.

#1:
condition = x.isnumeric()

#Checks whether x (string) only includes numeric characters, returns True if it does, else it returns False.
#if the method isnumeric finds decimal point "." or a subtraction mark "-", it also returns False, that's why it doesn't always work.

#2:
try:
int(x)
except ValueError:
condition = False
else:
condition = True

#Checks whether x can be converted to an integer.
#Also supports subtraction character to be included in x.

Then you could use the condition variable in if conditions later in the program.

Later in the program you could use:

if condition:
y = int(x)
else:
y = x

del condition

print("y is", " " if type(y) == int else " not ", "an integer", sep="")

Answer 2

Type can also be checked with:

val = 3 // 2
if isinstance(val, int):
# do ...

Answer 3

Rayyan, even if your work is done, i just want to give a very simple check from input() if it’s an int or not:

inp1 = '123'
inp2 = 'hello'

def is_int(check):
try:
int(check)
return True
except:
return False

print('inp1', is_int(inp1))
print('inp2', is_int(inp2))

Answer 4

But Seb TheS,
It can't be used with input() function as every object's type is str in input()

Answer 5

However, Thank you everyone for advising me right.
My work is done.

Answer 6

Kay, uh...
Thanks Lother!

Answer 7

But the type() only tells the class girl. I can't use it with if... else... statement.

Answer 8

Rayyan Nafees You can use type in if statements to test, whether an objects belongs to a certain class.
type(5) == int #True
type("5") == int #False
type("5") == str #True

But like Lothar mentioned isinstance(x, y) would perform the same work than type(x) == y
isinstance(5, int) #True
isinstance("5", int) #False
isinstance("5", str) #True