Python: Typeerror: Cannot Concatenate 'Str' and 'Int' Objects [Duplicate]

Question

I have this python program that adds strings to integers:

a = raw_input("Enter a: ")
b = raw_input("Enter b: ")
print "a + b as strings: " + a + b
a = int(a)
b = int(b)
c = a + b
str(c)
print "a + b as integers: " + c

I get this error:

Python: TypeError: cannot concatenate 'str' and 'int' objects

How can I add strings to integers?

Accepted Answer

There are two ways to fix the problem which is caused by the last print statement.

You can assign the result of the str(c) call to c as correctly shown by @jamylak and then concatenate all of the strings, or you can replace the last print simply with this:

print "a + b as integers: ", c  # note the comma here

in which case

str(c)

isn't necessary and can be deleted.

Output of sample run:

Enter a: 3
Enter b: 7
a + b as strings:  37
a + b as integers:  10

with:

a = raw_input("Enter a: ")
b = raw_input("Enter b: ")
print "a + b as strings: " + a + b  # + everywhere is ok since all are strings
a = int(a)
b = int(b)
c = a + b
print "a + b as integers: ", c

Answer 2

str(c) returns a new string representation of c, and does not mutate c itself.

c = str(c)

is probably what you are looking for

Answer 3

If you want to concatenate int or floats to a string you must use this:

i = 123
a = "foobar"
s = a + str(i)

Answer 4

c = a + b 
str(c)

Actually, in this last line you are not changing the type of the variable c. If you do

c_str=str(c)
print "a + b as integers: " + c_str

it should work.

Answer 5

Apart from other answers, one could also use format()

print("a + b as integers: {}".format(c))

For example -

hours = 13
minutes = 32
print("Time elapsed - {} hours and {} minutes".format(hours, minutes))

will result in output - Time elapsed - 13 hours and 32 minutes

Check out docs for more information.

Answer 6

You can convert int into str using string function:

user = "mohan"

line = str(50)

print(user + "typed" + line + "lines")

Answer 7

The easiest and least confusing solution:

a = raw_input("Enter a: ")
b = raw_input("Enter b: ")
print "a + b as strings: %s" % a  + b
a = int(a)
b = int(b)
c = a + b
print "a + b as integers: %d" % c

I found this on

Answer 8

I also had the error message "TypeError: cannot concatenate 'str' and 'int' objects". It turns out that I only just forgot to add str() around a variable when printing it. Here is my code:

def main():
	rolling = True; import random
	while rolling:
		roll = input("ENTER = roll; Q = quit ")
		if roll.lower() != 'q':
			num = (random.randint(1,6))
			print("----------------------"); print("you rolled " + str(num))
		else:
			rolling = False
main()

I know, it was a stupid mistake but for beginners who are very new to python such as myself, it happens.

Answer 9

This is what i have done to get rid of this error separating variable with "," helped me.

# Applying BODMAS 
arg3 = int((2 + 3) * 45 / - 2)
arg4 = "Value "
print arg4, "is", arg3

Here is the output

Must Read

Value is -113

(program exited with code: 0)

Python: Typeerror: Cannot Concatenate 'Str' and 'Int' Objects [Duplicate]

9 Answers

Must Read

Value is -113

Chloe Bennett