Typeerror: Can Only Concatenate Tuple (Not "Float") to Tuple

You've just started writing a Python program and then it hits you lot: a TypeError. This one's new to y'all: "typeerror: can simply concatenate str (not "int") to str". What does it mean? Why is it beingness raised in your code? These are all expert questions.

In this guide, nosotros're going to talk about what this Python error means and how you can solve it. Nosotros'll walk through an example program with this mistake and then that you can see how it works. Without further ado, let's go started!

The Problem: typeerror: tin just concatenate str (non "int") to str

In Python, values can but be concatenated if they are the same type. You cannot concatenate a string and an integer, or a cord and a list. If you practice, a TypeError is raised:

typeerror: can only concatenate str (non "int") to str

There are a few programming languages, like JavaScript, which allow y'all to concatenate strings and integers together. In Python, you cannot do this. If you want to concatenate a string and an integer, you lot've got to convert the integer to a cord starting time before you concatenate it to a string.

An Example State of affairs

This error is raised when you lot endeavour to concatenate a cord and an integer.

Let's take a look at a program which suffers from this trouble:

gatsby = { 	"title": "The Great Gatsby", 	"writer": "F. Scott Fitzgerald", 	"cost": 4.99, 	"quantity_in_stock": 4 }  impress("There are " + gatsby["quantity_in_stock"] + " copies of The Groovy Gatsby in stock.")

This program prints out how many copies of the book The Neat Gatsby are in stock at a bookstore. First, we declare a dictionary called "gatsby". This dictionary contains four pieces of information about the book: its title, the writer, its price, and how many copies are in stock.

Adjacent, nosotros print out a bulletin informing the user how many copies are in stock at the bookstore.

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Let's try to run our code:

Traceback (most recent call last): File "main.py", line eight, in <module> 	print("There are " + gatsby["quantity_in_stock"] + " copies of The Great Gatsby in stock.") TypeError: can simply concatenate str (not "int") to str

As we expected, a TypeError has been raised.

The Solution

The value of gatsby["quantity_in_stock"] is an integer. A TypeError has been raised because we have tried to concatenate that value, an integer, to a string.

Nosotros can solve this problem by converting the value of gatsby["quantity_in_stock"] to a string before we concatenate it to our other strings. We can practise this using the str() method, which converts an integer to a string:

impress("At that place are " + str(gatsby["quantity_in_stock"]) + " copies of The Nifty Gatsby in stock.")

Allow'southward try to run our code again:

There are 4 copies of The Bang-up Gatsby in stock.

Our code has establish how many copies of The Groovy Gatsby are in stock. Then, information technology has printed out how many copies are in stock to the console. This value is printed in the following format:

In that location are 10 copies of The Great Gatsby in stock.

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"Ten" refers to how many copies are in stock.

Decision

The mistake "typeerror: tin just concatenate str (not "int") to str" is raised when you endeavour to concatenate a string and an integer. To solve this error, make certain that all values in a line of code are strings before you try to concatenate them.

Now yous're ready to solve this Python TypeError like a pro!

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Source: https://careerkarma.com/blog/python-typeerror-can-only-concatenate-str-not-int-to-str/