How to fix the Python Indentation Error

The indentation error is one of the programming problems that might happen when using Python. Given that Python is one of the most widely used and cutting-edge programming platforms available right now, we needed to comprehend how it should be used.

This article describes the Python indentation error, how it appears in code, and how to correct it.

Python Indentation Error Contents

Indentation error overview
What does a Python programming language indentation mean?
What Causes Indentation Error in Python
Python Indentation Error Examples
How to fix the Python Indentation Error
Conclusion

Indentation Error Overview

In any programming language (PL), lines, spaces, and blocks make up a single unit of code. But occasionally each language's rules and syntax are different or similar.

In order to discuss the Python indentation problem, we will first examine how Python differs from other programming languages in this section.

What distinguishes Python from other computer PLs?

The Python programming language (PPL) is distinct from other programming languages (PLs) since it has its own rules and syntax. The following differences are related to the Python indentation error:

1. Python is an object-oriented, high-level, interpreted PL with dynamic semantics.

2. In comparison to other PLs, it has a relatively basic syntax and is very straightforward to implement.

3. We compare the PPL syntax with other PLs that have used the same syntax, including C, C++, Java, and numerous more. Opening and closing braces are used for each block of code.

4. However, we will adhere to the correct indentation rule in Python.

5. Indentation in any PL refers to the proper participation of white space while starting a particular block of code.

6. PPL is not too much complicated and not more focused on the syntax.

7. It is a lot more effective and fast than the other PLs.

8. Last but not least, Python code is simple to write, simple to implement, and simple to execute.

What does a PPL indentation mean?

We have seen in the previous section that Python programming language adheres to the correct indentation rule.

In this part, we are interested at the meaning of Python indentation error.

We must first comprehend the following Python rules in order to grasp what python indentation error is:

1. Indentation in the PPL refers to the use of the appropriate spaces and tabs at the beginning of each statement, procedure, and block of code.

2. These indentations make it simple to locate the start and stop of every conditional loop, function, if-else expression, and so forth.

3. Unlike PPL, other PLs like C, C++, and Java use small and curly braces along with the semicolon for specifying the particular block of code and identifying the particular statement.

4. Semicolons and other types of brackets are not a worry when using Python as a programming language.

Indentation rules of PPL

The Python programming language's indentation rules are generally as follows.

1. When beginning and terminating any code block in PPL, the proper indentation for that particular block of code must be preserved.

2. Using a backslash, a Python coder can divide the indentation into numerous lines.

3. As a result, the Python compilation will throw an indentation error if any block does not retain adequate indentation.

4. Instead of utilizing brackets for each block of code as we would in other PLs, the indentation makes it easier for Python programmers to implement the code using a simple syntax.

5. For a specific section of code, the amount of whitespace is previously predetermined. According to the rule of sub-sub statements, the quantity of whitespaces has increased if we utilize nested conditional statements.

What Causes Indentation Error in Python

The Python indentation error is the result of lines of Python code having no tabs or whitespace. Due to the procedural nature of Python, this indentation issue is most likely to occur if you forget to put tabs or spaces between your lines of code.

Although in some instances the complete program will execute without issue, in other instances the problem will happen in the middle of the execution, pausing the whole operation.

Some of the typical reasons for an indentation error in Python are listed below:

1. We use both the tabs and the spaces when we are coding. The functions of tab and space are equivalent in theory. However, while writing Python code, the interpreter is unsure of which alteration to apply and hence gives an indentation error.

2. When it comes to structuring the code, PPL adheres to strict rules; if any indentation is placed incorrectly, a Python indentation error will almost certainly result.

3. When completing a lengthy Python program, we occasionally have a tendency to forget to indent the compound statements like for, while, and if, which almost always results in a Python indentation error.

4. A Python indentation error will probably appear if you fail to use user defined classes in PPL.

Python Indentation Error Examples

As we saw in the last section, Python indentation errors are largely unavoidable if any indentation is placed in an improper place in PPL.

Some of the typical examples for an indentation error in Python are listed below:

Example 1: Using if statements

Example1 for indentation error in python:

#The Program to check if the user is logged in to
# The correct site
site = 'mcqsmonitor.com'
if site == 'mcqsmonitor.com':
print('Logging in to mcqsmonitor')
else:
    print('Please type the correct url')
print('You are already there')

Due to a lack of space, the first print of the code above has an error, which is seen below:

indentation error

To obtain the following code and its return, we fix the indentation error in the preceding image.

Example1 for not indentation error in python:

#The Program to check if the user is logged in to
# The correct site
site = 'mcqsmonitor.com'
if site == 'mcqsmonitor.com':
    print('Logging in to mcqsmonitor')
else:
    print('Please type the correct url')
print('You are already there')

The output of the above corrected code is as below:

not indentation error corrected

Example 2: Using if while loop

Example2 for indentation error in python:

#Program to print 1 to 5 while the condition is
# True
initial = 1
while (initial <=5):
        print(initial)
    initial = initial + 1

Because there is a lack of same space, the function print will return an error, which can be seen below:

indentation error example2

Now, we fix the indentation error above to obtain the following correct code:

Example2 for not indentation error in python:

#Program to print 1 to 5 while the condition is
# True
initial = 1
while (initial <=5):
    print(initial)
    initial = initial + 1

From the above code, the output of the corrected code is as below:

not indentation error

Example 3: Using if statements in JupyterLab

Example3 for indentation error in JupyterLab:

def Print_title(title):
        if type(title) == str:
        return title
        else:
        return 'Not a string'
title = 'Python IndentationError'
print(Print_title(title))

Due to a lack of same space on return, the code above has an error, which is seen below:

indentation error

We can fix the indentation error above by adding the space on return to get the following corrected code:

Example3 for not indentation error in python:

def Print_title(title):
    if type(title) == str:
        return title
    else:
        return 'Not a string'
title = 'Python IndentationError'
print(Print_title(title))

By running the correct code, we get the following output:

not indentation error

How to fix the Python Indentation Error

Python indentation errors are simple to find. The indentation is strictly a rule in Python, as we have seen above. The next line is automatically indented for the if, for, and while statements depending on the editor you are using.

To fix the Python indentation error, we need to look at the following picture of blocks for indentation.

not indentation error

Simply going to your editor and turning on the option to reveal the tabs and whitespaces is another approach to fix the Python indentation error. When this option is activated, the editor will display dots where spaces should be. If the dot is not visible, you probably just committed a Python indentation error.

Conclusion

The Python programming language has excellent usability. Because it primarily resembles English, it is extensively utilized. Tabs and whitespace are used to keep the code organized. Python does not require any brackets, like other PPLs. An error in Python's indentation is produced if these spaces are missing or improperly placed. Having the right spaces in the code will quickly fix the issue.

This article explained the causes of the Python indentation error and offered suggestions on how to keep our codes free of it.

We can concentrate on other python errors in subsequent articles.

Other Python Errors and Exceptions

"Messages known as Python errors and exceptions are shown when a program encounters an unexpected event. They provide information about the error that has happened and can assist in identifying the issue and locating a solution. These are some additional Python errors and exceptions that we have already covered."

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