Python supports string concatenation using the +
operator. In most other programming languages, if we concatenate a string with an integer (or any other primitive data types), the language takes care of converting them to a string and then concatenates it.
However, in Python, if you try to concatenate a string with an integer using the +
operator, you will get a runtime error.
Let’s look at an example for concatenating a string (str
) and an integer (int
) using the +
operator.
current_year_message = 'Year is '
current_year = 2018
print(current_year_message + current_year)
The desired output is the string: Year is 2018
. However, when we run this code we get the following runtime error:
Traceback (most recent call last):
File "/Users/sammy/Documents/github/journaldev/Python-3/basic_examples/strings/string_concat_int.py", line 5, in <module>
print(current_year_message + current_year)
TypeError: can only concatenate str (not "int") to str
So how do you concatenate str
and int
in Python? There are various other ways to perform this operation.
In order to complete this tutorial, you will need:
This tutorial was tested with Python 3.9.6.
str()
FunctionWe can pass an int
to the str()
function it will be converted to a str
:
print(current_year_message + str(current_year))
The current_year
integer is returned as a string: Year is 2018
.
%
Interpolation OperatorWe can pass values to a conversion specification with printf-style String Formatting:
print("%s%s" % (current_year_message, current_year))
The current_year
integer is interpolated to a string: Year is 2018
.
str.format()
functionWe can also use the str.format()
function for concatenation of string and integer.
print("{}{}".format(current_year_message, current_year))
The current_year
integer is type coerced to a string: Year is 2018
.
If you are using Python 3.6 or higher versions, you can use f-strings, too.
print(f'{current_year_message}{current_year}')
The current_year
integer is interpolated to a string: Year is 2018
.
You can check out the complete Python script and more Python examples from our GitHub repository.
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num = ([3,4,3,2,1]) print(reduce(lambda x,y: x * 10 + y ,num)) 34321
- Egmon
it works fine but takes too much time for instance if we have to convert integer to string 200 times , you would be able to notice the time taken to execute the code. How can we deal with that to make our code more efficient?
- future googler
Write a python program that asks the user how many coins of various types they have, and then prints the total amount of money in rupees.
- M P ANUPAMA
Hey Pankaj, thanks for sharing this article. This helped me to have a better understanding of formats used with print function
- Anupinder singh