Can Only Concatenate Str (Not "Nonetype") to Str

Summary: To eliminate the TypeError - tin merely concatenate str (not "int") to str typecast all the values into a single type.

Trouble Formulation: How to fix Typeerror: can only concatenate str (not "int") to str in Python?

Example:

impress ( '10' + five ) # expected output: xv print ( 'Java' + '2' + 'Weblog' ) # expected output: Java2Blog

Output:

Traceback (most recent call concluding):
File "main.py", line 1, in
impress('10'+5) # expected output: 15
TypeError: can but concatenate str (not "int") to str

❖ What is "TypeError" in Python?

In Python, a TypeError occurs when you perform an incorrect function call or utilize an incorrect operator blazon. For example, permit'southward run across what happens when we include two inconsistent types:

Case:

Output:

Traceback (most recent telephone call last):
File "D:/PycharmProjects/PythonErrors/rough.py", line 2, in
print(var[1])
TypeError: 'int' object is non subscriptable

Python throws a TypeError because int type objects are non accessible past using the index. To access an element using its alphabetize- you must create a list, tuple, or cord type objects.

❖ What does TypeError: tin only concatenate str (not "int") to str mean ?

To empathise this Typeerror, permit's consider the post-obit example:

impress ( three + 5 ) # adding ii integers print ( 'john' + 'monty' ) # concatenating two strings impress ( 'light-green ' * 3 ) # multiplying an int and a string print ( 'Java' + ii + 'Blog' ) # Concatenating ii strings and an integer

Output:

8
johnmonty
green green light-green
Traceback (most recent call last):
File "principal.py", line iv, in
print('Java' + ii + 'Blog') # Concatenating 2 strings and an integer
TypeError: can only concatenate str (not "int") to str

The first iii lines of code piece of work fine because the concatenation between the same types and multiplication between an integer and a string is allowed in Python.

✨ As Python is a dynamic programming language, the first 3 lines of code are executed, and then Python throws TypeError: tin can only concatenate str (not "int") to str because concatenating a string and a numeric value (int) is not immune in Python.

Now that we know the reason behind the occurrence of this error, let'due south dive into the solutions:

◈ Solution i: Utilise Same Data Types

Instead of concatenating an integer and a cord, you can locate the line inside your lawmaking causing the error. So rectify information technology to ensure that you concatenate two values of the same type, i.east., both the values are strings.

You can hands place and eliminate the TypeError by utilizing an IDE that checks for errors. If yous don't have whatever thought where the bug is and you are not utilizing the IDE, it is beneficial to download one as it makes it simpler to notice the bug in the code.

The Solution:

print ( 10 + v ) # expected output: 15 impress ( 'Java' + '2' + 'Blog' ) # expected output: Java2Blog

Output:

15
Java2Blog

In whatever case, this method is incapable of more complex codes since you practise it all manually! 😉

◈ Solution 2: Typecasting The Data Types to Concatenate/Add Similar Types

Detect in which line of code TypeError showed up and then typecast the values to represent the same type.

• When you desire to add together two numbers, you have to typecast both values to 'int'.
• When you want to concatenate two texts, typecast them to 'str'.

print ( int ( '10' ) + 5 ) # expected output: 15 print ( 'Coffee' + str ( 2 ) + 'Blog' ) # expected output: Java2Blog

Output:

fifteen
Java2Blog

⚠️ Caution:This method isn't platonic when you have a ton of information that y'all need to combine because it is a cumbersome job to manually typecast every variable ane past one.

◈ Solution 3: Using The format() Function

❖ The format() function is used in Python for String Concatenation. This function joins various elements inside a cord through positional formatting.

Case:

a = "John" b = 13 print ( "{} {}" . format ( a , b ) )

Output:

John13

The braces ("{}") are utilized here to fix the string position. The variable 'a' is stored in the first brace, and the second variable 'b' gets stored in the 2nd curly brace. The format() function combines the strings stored in both variables "a" and "b" and displays the concatenated cord.

◈ Solution 4: Using The join() and str() Role Together

The bring together() method is the near adaptable method of concatenating strings in Python. If you accept numerous strings and you need to combine them, apply the join() function. The most interesting affair about join() is that you tin concatenate strings utilizing a separator. Hence, it also works at iterators like tuples, strings, lists, and dictionaries.

To combine integers into a single string, apply the str() function to every element in the list and then combine them with the join() as shown beneath.

a = [ 0 , one , 2 ] ten = '-' . join ( ( str ( n ) for n in a ) ) impress ( x )

Output:

0-1-2

◈ Solution 5: Use Role

Another approach to resolve our trouble is to create a convert function that converts a variable from one type to some other.

Case:

1 2 3 four five vi seven 8 9 10 11 12 13 14 xv 16 17 eighteen 19 20

def convert ( a , b , type_ ) : a = type_ ( a ) b = type_ ( b ) return a , b 10 , y = convert ( 'Python' , 3.18 , str ) print ( 'First: Converting To String' ) print ( blazon ( x ) ) print ( type ( y ) ) print ( "Output: " , x + " " + y ) a , b = convert ( 'ten' , 5 , int ) print ( '\n Second: Converting To Integer' ) print ( blazon ( a ) ) impress ( type ( b ) ) print ( "Output: " , a + b )

Output:

First: Converting To Cord
<form 'str>'
<class 'str'>
Output: Python three.18
Second: Converting To Integer
<class 'int'>
<class 'int'>
Output: 15

If there are more than than two variables that yous need to convert using a list equally shown beneath.

one 2 3 iv 5 half dozen 7 8 9 10 xi 12 thirteen 14 fifteen 16 17 18 nineteen 20 21 22 23 24

def catechumen ( list1 , type_ ) : for x in range ( len ( list1 ) ) : list1 [ x ] = type_ ( list1 [ x ] ) a = 20 b = '25' c = '43' list2 = [ a , b , c ] impress ( '\n String values:' ) convert ( list2 , str ) print ( [ type ( number ) for number in list2 ] ) impress ( list2 ) print ( '\n Integer values:' ) convert ( list2 , int ) print ( [ blazon ( number ) for number in list2 ] ) print ( list2 ) print ( list2 [ 0 ] + list2 [ one ] )

Output:

String values:
[, , ]
['20', '25', '43']
Integer values:
[, , ]
[twenty, 25, 43]
45

Conclusion

I hope yous found this article helpful. Delight stay tuned and subscribe for more interesting articles! 📚

This article was submitted by Rashi Agarwal and edited past Shubham Sayon.

weaverarans1936.blogspot.com

Source: https://java2blog.com/typeerror-can-only-concatenate-str-not-int-to-str/?_page=22

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