Python Indentationerror: Expected An Indented Block
Last Updated :
14 Feb, 2024
Python's elegant and readable syntax relies heavily on indentation to define code blocks. However, developers may encounter challenges, notably the "IndentationError: Expected an Indented Block." This error occurs when Python expects an indented block of code following a statement but encounters an issue with the indentation structure. In this article, we will explore the nature of this error, delve into common reasons behind its occurrence, and provide practical solutions for resolution.
What is "IndentationError: Expected an Indented Block" Error in Python?
The "IndentationError: Expected an Indented Block" is a Python error that arises when the interpreter encounters a statement that should be followed by an indented block, but no such block is provided. Python relies on indentation to determine the structure of code blocks, making it a fundamental aspect of the language's syntax.
Reasons for "IndentationError: Expected an Indented Block" In Python
Below are some of the following reasons for this IndentationError: Expected an Indented Block error in Python:
- Missing Indentation
- Inconsistent Indentation
- Misplacement of Colons
Missing Indentation
One of the most common reasons for this error is omitting the required indentation after a statement that typically signifies the beginning of a code block, such as after an "if," "else," or "for" statement.
Python3
if True:
print("IndentationError expected.")
Output:
Hangup (SIGHUP)
File "Solution.py", line 2
print("IndentationError expected.")
^
IndentationError: expected an indented block
Inconsistent Indentation
Python enforces consistent indentation within the same block of code. Mixing spaces and tabs or using varying indentation levels can trigger the "IndentationError: Expected an Indented Block."
Python3
if True:
print("Indented with spaces.")
else:
print("Indented with tabs - IndentationError expected.")
Output:
Hangup (SIGHUP)
File "Solution.py", line 3
else:
^
IndentationError: expected an indented block
Misplacement of Colons
Colons (:) are used to indicate the start of an indented block. Forgetting to place a colon at the end of a statement that requires indentation can lead to this error.
Python3
if True:
print("Missing colon - IndentationError expected.")
Output:
Hangup (SIGHUP)
File "Solution.py", line 2
print("Missing colon - IndentationError expected.")
^
IndentationError: expected an indented block
Solution for "IndentationError: Expected an Indented Block" In Python
Below are some of the solution for IndentationError: Expected an Indented Block in Python:
- Ensure Proper Indentation
- Check for Mixing Spaces & Tabs
- Verify Placement of Colons
Ensure Proper Indentation
Verify that the code has the correct indentation after statements like "if," "else," or "for." Python conventionally uses four spaces for each level of indentation, but consistency is key.
Python3
condition = True
if condition:
print("Code block executed.")
OutputCode block executed.
Check for Mixing Spaces and Tabs
Avoid mixing spaces and tabs for indentation within the same code block. Consistently use either spaces or tabs throughout the entire script to prevent indentation conflicts.
Python3
condition = True
if condition:
print("Indented with spaces.")
else:
print("Indented with tabs.") # Mixing spaces and tabs causes an error
OutputIndented with spaces.
Verify Placement of Colons
Confirm that colons are correctly placed at the end of statements that initiate an indented block. Failure to include a colon will result in the "IndentationError."
Python3
condition = True
if condition:
print("Verified Colon")
Conclusion
In conclusion, resolving the "IndentationError: expected an indented block" is straightforward and involves carefully inspecting the indentation of your code. Ensure that proper spaces or tabs are used consistently to define code blocks within control flow statements like loops or conditional structures. Double-check for any mismatched indentation levels and correct them accordingly.
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