Python: TypeError: cannot concatenate 'str' and 'int' objects [duplicate]

Question

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

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

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

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

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.

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.

You can convert int into str using string function:

user = "mohan"

line = str(50)

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