[Solved] IndentationError: Expected An Indented Block Error
Error handling is one of the best features of Python. With known error Exceptions, you can reduce the bugs in your program. As Python operates on indentation blocks for deducing the inside block for any statement, you may encounter IndentationError: Expected An Indented Block Error.
IndentationError: Expected An Indented Block Error is a known error in python which is thrown when an indented block is missing from the statement. IndentationError states that there is an error related to the Indentation of general statements in your code. In Python, general statement blocks expect an indentation in child statements. If you fail to provide these indentations, Indentation Error will arise.
In this tutorial, we will be discussing a new type of error, i.e., IndentationError: expected an indented block. We all know c, c++, and java when we write any loop, conditional statements, or function code inside the brackets. But in python, it is actually part of this programming language.
What is meant by Indentation?
The meaning of Indentation in python is the space from margin to the beginning of characters in a line. Where in other programming languages, indentation is just for the sake of the readability purpose. But in python, indentation is necessary.
What is IndentationError: Expected an indented block?
In most popular programming languages like c, c++, and java, spaces or indentation are just used to make the code look good and be easier to read. But In Python, it is actually part of this programming language. Because python is the sensitive language for indentation, many beginners face confusion or problems in the starting as Putting in extra space or leaving one out where it is needed will surely generate an error message. Some causes of indentation error are:
- When we forget to indent the statements within a compound statement
- When we forget to indent the statements of a user-defined function.
The error message IndentationError: expected an indented block would seem to indicate that you have a spaces error or indentation error.
Examples of IndentationError: Expected an indented block
Here are some examples through which you will know about the Indentation error: expected an indented block.
1. IndentationError: Expected an indented block in IF condition statements
In this example, we will be using the if condition for writing the code and seeing the particular error. We have taken two variables, ‘a’ and ‘b,’ with some integer value. Then, applied if condition and no indented the if block. Let us look at the example for understanding the concept in detail.
Output:
Explanation:
- Firstly, we have taken two variables, ‘a’ and ‘b,’ and assigned the values 10 and 20 in them.
- Then, we have applied if condition.
- And at last, without giving the indentation block of if statement we have printed b is greater than a.
- Hence, we have seen the output as IndentationError: expected an indented block.
2. If-else condition for seeing the error as expected an indented block
In this example, we will be using the if-else condition for writing the code and seeing the particular error. We have taken two variables, ‘a’ and ‘b,’ with some integer value. Then, applied the if-else condition and indented the if block but not the else block. So let’s see which error occurs. Let us look at the example for understanding the concept in detail.
Output:
Explanation:
- Firstly, we have taken two variables, ‘a’ and ‘b,’ and assigned the values 10 and 20 in them.
- Then, we have applied the if-else condition.
- In the if condition, we have applied the tab space but not in the else condition.
- And at last, without giving the indentation block of else statement, we have tried to print b is smaller than a.
- Hence, we have seen the output as IndentationError: expected an indented block.
3. Indentation Error: expected an indented block in Docstring Indentation
In this example, we will be showing that the error can also come up if the programmer forgets to indent a docstring. Docstrings must be in the same line with the rest of the code in a function. The Docstring processing tools will strip an amount of indentation from the second and further lines of the docstring, equal to the minimum indentation of all unblank lines after the first line. Let us look at the example for understanding the concept in detail.
Output:
4. Indentation Error: expected an indented block in Tabbed Indentation
In this example, we will see the indentation error in the tabbed indentation. As you can see in the code, while writing “This is a comment docstring,” we have passed the tab space for an indent, and in print () there is less indent. so this will produce a tabbed indentation. Let us look at the example for understanding the concept in detail.
Output:
5. Indentation Error: expected an indented block in empty class/function
In this example, we will see the error in an empty class. We have declared two classes with the name as EmptyClass and MainClass. But in Class EmptyClass, we didn’t pass (statement) any indent, so it generated the error. Let us look at the example for understanding the concept in detail.
Output:
Where Indentation is required?
The indentation is required in the python block. Whenever you encounter a colon(:) is a line break, and you need to indent your block. Python uses white space to distinguish code blocks. You are allowed to use spaces and tabs to create a python block. When several statements in python use the same indentation, they are considered as a block. Basically, Indentation is required to create a python block or write the loop, conditional statements, and user-defined function you require indentation.
How to solve the IndentationError: expected an indented block
To solve this error, here are some key points which you should remember while writing the program or code:
- In your code, give the indent with only the tab spaces, equal to every loop, conditional, and user-defined function.
- Otherwise, in your code, give the indent with only the spaces equal to every loop, conditional, and user-defined function.
Examples of solved IndentationError: expected an indented block
Here are some examples through which you will know how to solve the error Indentation error: expected an indented block.
1. If-else conditional statement indentation
In this example, we will be using the if-else condition for writing the code and seeing the particular output. We have taken two variables, ‘a’ and ‘b,’ with some integer value. After this, I applied the if-else condition with a proper indentation in both conditions and printed the output. Let us look at the example for understanding the concept in detail.
Output:
Explanation:
- Firstly, we have taken two variables, ‘a’ and ‘b,’ and assigned the values 10 and 20 in them.
- Then, we have applied the if-else condition.
- While applying the if-else condition, we have given the proper indentation of a tab in both the condition of if and as well as of else condition.
- And printed the output after checking the condition.
- Hence, we have seen the output without any IndentationError: expected an indented block error.
2. For loop statement indentation
In this example, we have applied for loop and printed the output while giving the proper indentation for the loop block. Let us look at the example for understanding the concept in detail.
Output:
Explanation:
- In this example, we have applied for loop.
- The for loop is starting from 1 and going till 10.
- And with proper indent, we have printed the value of i.
- Hence, you can see the correct output without any error.
How to fix indentation in some code editors
1. Sublime text
For setting the indentation in sublime text editor you need to perform the following steps:
To set the Indentaion to tabs
- Go to view option.
- Choose Indentation.
- Convert Indentation to tabs.
And go to the sub-menu and look for the ‘Indent Using Spaces’ option and uncheck it.
2. VS code
For setting the indentation in VS code text editor you need to perform the following steps:
- Go to the File menu.
- Choose preferences.
- Choose settings.
- Type tabsize in the search bar.
- Then, uncheck the checkbox of Detect Indentation.
- Change the tab size to 2 or 4 according to your choice.
3. Pycharm
For setting the indentation in Pycharm text editor you need to perform the following steps:
- Go to the File menu.
- Choose settings.
- Then, Choose the editor.
- Choose code style.
- Choose Python.
- And choose tabs and indents.
- Suppose it is set to 0. please set it to 4. which is recommended by PEP8.
Conclusion
In this tutorial, we have learned the concept of IndentationError: expected an indented block. We have seen what Indentation is, what indentation error is, how indentation error is solved, why it is required to solve the indentation error. We have also explained the examples of showing the IndentationError: expected an indented block and the examples of showing the solution of the given error. All the examples are explained in detail with the help of examples.
However, if you have any doubts or questions, do let me know in the comment section below. I will try to help you as soon as possible.
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1. What does expected an indented block mean in Python?
Excepted an indented block error in python, we must have at least one line of code while writing the function, conditional statements, and loops. We can also say that a conditional must have at least one line of code to run if the condition is true.
2. How to follow pep8 format to avoid getting IndentationError?
PEP8 formats says to you should follow 4 spaces indentation to avoid getting error.
How to fix indentation Error in Python
If you are new to coding or an experienced coder, you might have come across indentation error in python. It looks silly but it can pause the entire process and take good amount of time to fix it. I can help you saving some of your precious time. So, lets dive little deeper into it and understand what is indentation and how to fix it
Python is a procedural language. An indentation in Python is used to segregate a singular code into identifiable groups of functionally similar statements. The indentation error can occur when the spaces or tabs are not placed properly. There will not be an issue if the interpreter does not find any issues with the spaces or tabs. If there is an error due to indentation, it will come in between the execution and can be a show stopper.
Python follows the PEP8 whitespace ethics while arranging its code and therefore it is suggested that there should be 4 whitespaces between every iteration and any alternative that doesn’t have this will return an error.
Below are some of the common causes of an indentation error in Python:
- While coding you are using both the tab as well as space. While in theory both of them serve the same purpose, if used alternatively in a code, the interpreter gets confused between which alteration to use and thus returns an error.
- While programming you have placed an indentation in the wrong place. Since python follows strict guidelines when it comes to arranging the code, if you placed any indentation in the wrong place, the indentation error is mostly inevitable.
- Sometimes in the midst of finishing a long program, we tend to miss out on indenting the compound statements such as for, while and if and this in most cases will lead to an indentation error.
- Last but not least, if you forget to use user defined classes, then an indentation error will most likely pop up.
Errors due to indentation in Python:
Python determines when code blocks begin and stop by looking at the space at the beginning of the line. You may encounter the following Indentation errors:
- Unexpected indent — This line of code has more spaces at the beginning than the one before it, but the one before it does not begin a sub block. In a block, all lines of code must begin with the same string of whitespace.
- Unindent does not correspond to any of the outer indentation levels — This line of code contains less spaces at the beginning than the previous one, but it also does not match any other block.
- An indented block was expected — This line of code begins with the same number of spaces as the previous one, yet the previous line was supposed to begin a block (e.g., if/while/for statement, function definition).
Few tips to solve an indentation error in Python:
1. While there is no quick fix to this problem, one thing that you need to keep in mind while trying to find a solution for the indentation error is the fact that you have to go through each line individually and find out which one contains the error.
In Python, all the lines of code are arranged according to blocks, so it becomes easier for you to spot an error. For example, if you have used the if statement in any line, the next line must definitely have an indentation.
Take a look at the example below.
If you need guidance on how the correct form of indentation will look like, take a look at the example below.
2. Go to your code editor settings and enable the option that seeks to display tabs and whitespaces. With this feature enabled, you will see single small dots, where each dot represents a tab/white space. If you notice a drop is missing where it shouldn’t be, then that line probably has an indentation error.
For Pycharm, please go to file — settings — editor — code style — python
3. Use the Python interpreter built-in Indent Guide. It takes you through each line and shows you exactly where your error lies, it is the surest way to find and fix all errors.
Conclusion:
Getting errors are inevitable part of programming, so is debugging. One cannot ignore indentation error while working with python but above tips show that it can be easily resolved. Hope this information makes your life little easy and programming journey more exciting.
Why do I get "expected an indented block" when I try to run my Python script? [closed]
First, readability count. Your code is hard to read and so, is hard to debug. What’s «ch» and «f» ? What’s more, you can do one liner in Python but it’s not recommended, so put the for in a separate line. Then indent.
Now we can see what’s wrong. You make variable assignments in a conditional statement. This is not allowed in Python. I’m guessing you have a C/C++ background and are used to do that. In Python you can’t, to prevent you from writing obfuscated code. So you end up with:
This piece of code should work, provided you use Python 2.5+. But the ternary operator is not available in older Python version yet. Let’s make it a bit friendlier:
You may argue that it’s longer to write, and you’d be right. But you spend more time reading code than writing it, so it make sense to make it easy to read. Or course, once you have the Python grip, you will try to make it work in a more pythonic way. Ever heard of EAFTP?
But Python is full of surprises, and you’ll learn that most of these classic use cases have been already taken care of. The standard library often provides an elegant and short yet readable solution:
As a conclusion: don’t try to write Python as you wrote C, or Java as you would write Perl. Other tool, other style.
To fix this problem, fire your editor «search and replace» feature and make a huge «replace all» to change all the tabs by 4 spaces, or the contrary. Then indent all your blocks, and finally align all the instructions in the same block.
Funny that didn’t appear before on SO. After all, it’s true it’s not that obvious.
In Python, you separate blocks using spaces or tabs, not «<".
So any time you go down a block (a function, a loop, a class, etc), you have to indent your code. This is not just good practice, this is mandatory. Your program will crash if you don’t.
Now, most of the time, you get this error because you did indent, but used tabs and spaces. In a Python program, you should use either tabs or spaces, but never both in the same files.
In most languages, you could do:
In Python you can’t:
raises an exception. What’s more, you must align all the instruction of the same block, so:
raises an exception.
Eventually, you can’t mix tab and spaces in the same block. So:
looks good, but will raises an exception. To avoid this problem, just stick to tabs or spaces. The PEP8, the text one most use as a reference for coding style recommend using 4 spaces.
Most editors have a global «search and replace» feature that let you fix any problem you can have with that. Some like Geany or Ulipad even have a «replace all tabs with spaces» feature.
IndentationError: expected an indented block
The IndentationError: expected an indented block error indicates that you have an indentation error in the code block, which is most likely caused by a mix of tabs and spaces. The indentation is expected in an indented block. The IndentationError: expected an indented block error happens when you use both the spaces and tabs to indent in your code. The indent is expected in a block. To define a code block, you may use any amount of indent, but the indent must match exactly to be at the same level.
The python IndentationError: expected an indented block error occurs when you forget to indent the statements within a compound statement or within a user-defined function. In python, the expected an indented block error is caused by a mix of tabs and spaces. If you do not have appropriate indents added to the compound statement and the user defined functions, the error IndentationError: expected an indented block will be thrown.
The indent is known as the distance or number of empty spaces between the line ‘s beginning and the line’s left margin. The intent is used in order to make the code appear better and be easier to read. In python, the intent is used to describe the structure of the compound statement and the user-defined functions
Exception
In the compound statement and the user-defined functions, the inside code must be indented consistently. If you failed to add an indent, the error IndentationError: expected an indented block is shown. The error message suggests that the code lacks indentation.
The error IndentationError: expected an indented block is shown to be like the stack trace below. The error message displays the line that the indent is supposed to be added to.
Root Cause
Python is the sentivite language of indentation. Compound statement and functions require an indent before starting a line. The error message IndentationError: expected and indented block is thrown due to a lack of indent in the line that the python interpreter expects to have.
There’s no syntax or semantic error in your code. This error is due to the style of writing of the program
Solution 1
In most cases, this error would be triggered by a mixed use of spaces and tabs. Check the space for the program indentation and the tabs. Follow any kind of indentation. The most recent python IDEs support converting the tab to space and space to tabs. Stick to whatever format you want to use. This is going to solve the error.
Check the option in your python IDE to convert the tab to space and convert the tab to space or the tab to space to correct the error.
Solution 2
In the sublime Text Editor, open the python program. Select the full program by clicking on Cntr + A. The entire python code and the white spaces will be selected together. The tab key is displayed as continuous lines, and the spaces are displayed as dots in the program. Stick to any format you wish to use, either on the tab or in space. Change the rest to make uniform format. This will solve the error.
Program
Solution
Solution 3
The program has no indentation where the python interpreter expects the indentation to have. The blocks are supposed to have an indentation before the beginning of the line. An indentation should be added in line 4 in the example below
Program
Output
Solution
Output
Solution 4
Python may have an incomplete block of statements. There may be a missing statement in the block. Some of the lines may be incomplete or deleted from the program. This is going to throw the indentation error.
Add missing lines to the program or complete the pending programming. This is going to solve the error.
program
Solution
Output
Solution 5
In the above program, if the else block is irrelevant to logic, remove the else block. This will solve the indent error. The Python interpreter helps to correct the code. Unnecessary code must be removed in the code.
Program
Output
Solution
Output
Solution 6
In the python program, check the indentation of compound statements and user defined functions. Following the indentation is a tedious job in the source code. Python provides a solution for the indentation error line to identify. To find out the problem run the python command below. The Python command shows the actual issue.
Command
Example
Solution 7
There is an another way to identify the indentation error. Open the command prompt in Windows OS or terminal command line window on Linux or Mac, and start the python. The help command shows the error of the python program.