Unlike many other programming languages out there, Python does not implicitly typecast integers (or floats) to strings as soon as you concatenate them come strings.

You are watching: Typeerror: must be str, not int

Fortunately, Python has a comfortable built-in function str() i m sorry will convert the dispute passed in come a wire format.

The Wrong means to transform a String come an creature in Python

Programmers comes from various other programming languages may attempt to execute the adhering to string concatenation, i m sorry will produce an error:

age = 18string = "Hello, i am " + period + " years old"You have the right to run this password on repl.it.

The error that mirrors up is:

Traceback (most recent call last): record "python", heat 3, in TypeError: should be str, not intHere, TypeError: must be str, not int indicates that the integer must an initial be converted to a string prior to it deserve to be concatenated.

The Correct way to transform a String to an essence in Python

Here"s a basic concatenation example:

age = 18print("Hello, ns am " + str(age) + " years old")# Output# Hello, ns am 18 year oldYou deserve to run this password on repl.it.

Here"s just how to publish 1 2 3 4 5 6 7 8 9 10 making use of a solitary string:

result = ""for i in range(1, 11): result += str(i) + " "print(result)# Output# 1 2 3 4 5 6 7 8 9 10You have the right to run the code on repl.it.

Here"s a line-by-Line explanation of how the over code works:

First of every a change ‘result’ is assigned come an empty string.The for loop is being offered to iterate end a perform of numbers.This perform of number is created using the variety function.so range(1,11) is going to generate a perform of numbers from 1 come 10.On each because that loop iteration this ‘i’ change is walking to take up worths from 1 to 10.On first iteration as soon as the variable i=1,then the variable ,str(i) converts the ‘i’ i beg your pardon is one integer value to a cable value.Since i=1, top top the very first iteration ultimately result=1.And the same process goes on until i=10 and also finally ~ the critical iteration result=1 2 3 4 5 6 7 8 9 10.Therefore once we ultimately print the result after the because that loop the calculation on the console is ‘1 2 3 4 5 6 7 8 9 10’.

I expect you"ve found this helpful. Happy coding.

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kris Tse

I'm a software program engineer at Oracle Netsuite doing prior end advancement with React and also Sass. I additionally enjoy developing fast, responsive sites through the JAMStack.


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