Why Do I Get a \'Bad Magic Number\' ImportError in Python, and How Can I Fix It?-Python Tutorial-php.cn

Home

Backend Development

Python Tutorial

Why Do I Get a \'Bad Magic Number\' ImportError in Python, and How Can I Fix It?

Barbara Streisand

Oct 31, 2024 am 05:51 AM

Why Do I Get a

Understanding the "Bad Magic Number" ImportError

The "Bad magic number" ImportError occurs in Python when an imported pyc file contains an incorrect magic number, which is a marker indicating the file type in UNIX-like systems.

This error can arise due to several reasons:

Compilation from Incorrect Python Version: Compiling a .py file into a .pyc file using a different Python version than the one used to import it.
File Manipulation: Editing or corrupting the pyc file.
Missing or Incompatible Library: Importing a pyc file that is missing a required library or is incompatible with the current Python version.

To resolve this issue, follow these steps:

Delete Pyc Files: Delete all .pyc files associated with the imported module. This forces the interpreter to recompile the .py files upon import. You can use the following commands in a UNIX terminal:
```
rm *.pyc
```
```
find . -name '*.pyc' -delete
```
Verify Library Dependencies: Ensure that all the required libraries for the module you're importing are installed and compatible with your Python version.
Inspect Full Stack Trace: If the issue persists intermittently, carefully examine the full stack trace during the import error. It may reveal insights into the specific cause.

Magic Number Values: Refer to the following table for the magic numbers associated with various Python versions:

Python Version	Magic Number
1.5, 1.5.1, 1.5.2	20121
1.6	50428
2.0, 2.0.1	50823
2.1, 2.1.1, 2.1.2	60202
2.2	60717
2.3a0 (various builds)	62011, 62021, 62041
2.4a0	62051
2.4a3	62061
2.5a0 (various builds)	62071, 62081, 62091, 62092
2.5b3 (various builds)	62101, 62111
2.5c1	62121
2.5c2	62131
2.6a0	62151
2.6a1	62161
2.7a0	62171

Understanding the bad magic number error and its causes will assist you in effectively resolving this issue when encountered.

The above is the detailed content of Why Do I Get a \'Bad Magic Number\' ImportError in Python, and How Can I Fix It?. For more information, please follow other related articles on the PHP Chinese website!

Statement

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Merging Lists in Python: Choosing the Right MethodMay 14, 2025 am 12:11 AM

TomergelistsinPython,youcanusethe operator,extendmethod,listcomprehension,oritertools.chain,eachwithspecificadvantages:1)The operatorissimplebutlessefficientforlargelists;2)extendismemory-efficientbutmodifiestheoriginallist;3)listcomprehensionoffersf

How to concatenate two lists in python 3?May 14, 2025 am 12:09 AM

In Python 3, two lists can be connected through a variety of methods: 1) Use operator, which is suitable for small lists, but is inefficient for large lists; 2) Use extend method, which is suitable for large lists, with high memory efficiency, but will modify the original list; 3) Use * operator, which is suitable for merging multiple lists, without modifying the original list; 4) Use itertools.chain, which is suitable for large data sets, with high memory efficiency.

Python concatenate list stringsMay 14, 2025 am 12:08 AM

Using the join() method is the most efficient way to connect strings from lists in Python. 1) Use the join() method to be efficient and easy to read. 2) The cycle uses operators inefficiently for large lists. 3) The combination of list comprehension and join() is suitable for scenarios that require conversion. 4) The reduce() method is suitable for other types of reductions, but is inefficient for string concatenation. The complete sentence ends.

Python execution, what is that?May 14, 2025 am 12:06 AM

PythonexecutionistheprocessoftransformingPythoncodeintoexecutableinstructions.1)Theinterpreterreadsthecode,convertingitintobytecode,whichthePythonVirtualMachine(PVM)executes.2)TheGlobalInterpreterLock(GIL)managesthreadexecution,potentiallylimitingmul

Python: what are the key featuresMay 14, 2025 am 12:02 AM

Key features of Python include: 1. The syntax is concise and easy to understand, suitable for beginners; 2. Dynamic type system, improving development speed; 3. Rich standard library, supporting multiple tasks; 4. Strong community and ecosystem, providing extensive support; 5. Interpretation, suitable for scripting and rapid prototyping; 6. Multi-paradigm support, suitable for various programming styles.

Python: compiler or Interpreter?May 13, 2025 am 12:10 AM

Python is an interpreted language, but it also includes the compilation process. 1) Python code is first compiled into bytecode. 2) Bytecode is interpreted and executed by Python virtual machine. 3) This hybrid mechanism makes Python both flexible and efficient, but not as fast as a fully compiled language.

Python For Loop vs While Loop: When to Use Which?May 13, 2025 am 12:07 AM

Useaforloopwheniteratingoverasequenceorforaspecificnumberoftimes;useawhileloopwhencontinuinguntilaconditionismet.Forloopsareidealforknownsequences,whilewhileloopssuitsituationswithundeterminediterations.

Python loops: The most common errorsMay 13, 2025 am 12:07 AM

Pythonloopscanleadtoerrorslikeinfiniteloops,modifyinglistsduringiteration,off-by-oneerrors,zero-indexingissues,andnestedloopinefficiencies.Toavoidthese:1)Use'i

See all articles