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- “Resolved: Python Error: IndentationError: expected an indented block problem”
-
- Summary
- introduction
- text
-
- What is `IndentationError`
- Why does this error occur?
-
- Missing indentation
- Indentation is inconsistent
- Mix tabs and spaces
- How to solve
-
- Use automatic formatting tools
- Unify indentation style
- Editor configuration
- Code fix example
- how to avoid
- Table: Common indentation errors and fixes
- Summarize
- References
- Insert image description here
- Original statement
《Resolved: Python Error: IndentationError: expected an indented block problem》
Abstract
Hello, the cat-headed tiger blogger is here! Today, we are going to dig deeper into a common bug in the back-end field – Python’s IndentationError. We programmers will always encounter some moments in our lives where “the indentation is not standardized and the colleagues cry two lines”, but don’t be afraid, this cat-headed tiger blogger can also solve this problem by tapping the keyboard with his paws. This bug is simply an inconspicuous hole in the programming grass. What we have to do is to fill it up and make the road of code smooth again. Next, let us take a look at how this indentation error occurs and how to avoid and solve it elegantly!
Introduction
In the world of Python, indentation is not just a code aesthetic, but also a part of the syntax. Correct indentation allows the interpreter to understand the structure of the code block, and IndentationError is telling us: “Hey, you should indent here!” Today, we will thoroughly understand this error , and learn how to avoid it so we can write clearer and more elegant Python code.
Text
What is IndentationError
In Python, when the indentation level of the code is incorrect or inconsistent, the interpreter will throw an IndentationError.
def greet():
print("Hello, World!") # The lack of indentation here will cause an error
Why does this error occur
Missing indent
if True:
print("This will cause an IndentationError.") # Indentation should be added before print
Indentation is inconsistent
def foo():
print("All good.")
print("This will cause an error.") # The indentation of this line is inconsistent with the previous line
Mix tabs and spaces
In Python 3, you cannot mix tabs and spaces for indentation, which results in IndentationError.
How to solve
Use automatic formatting tools
Use tools such as autopep8 or black to automatically format code and solve indentation problems.
Uniform indentation style
Choose Tab or Space and keep it consistent throughout your project.
Editor configuration
Configure your text editor or IDE to insert a fixed number of spaces (usually 4) when the Tab key is pressed.
Code fix example
Here is an example to fix IndentationError:
# Error code
def bad_indent():
print("This will raise an IndentationError")
# Fixed code
def good_indent():
print("This is correctly indented")
How to avoid
To avoid IndentationError:
- Always use 4 spaces for indentation.
- Don’t mix tabs and spaces in the same file.
- Use an editor or IDE that supports Python indentation.
- Regularly check your code style using code inspection tools.
Table: Common indentation errors and fixes
| Error type | Sample code | Fixing method |
|---|---|---|
| Missing indentation | if True: print("Hello") |
if True:\\ |
| Inconsistent indentation | def foo():\\ |
def foo():\\ |
| Mix tabs and spaces | if True:\\ |
if True:\\ |
| Study | Review |
|---|---|
| ? | ? |
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