✅️ How to Reload a Modified Module in Python
In Python, when you import a module, it's only loaded once from disk and then cached in memory (RAM). So if you modify that module later, Python won’t reload it automatically — even if you import it again!
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💡 Example:
Let’s say you have a file called mathutils.py with:
def add(a, b):
return a + b
You import it in main.py like this:
import mathutils
Later, you update mathutils.py and add a new function:
def subtract(a, b):
return a - b
If you now run import mathutils again in main.py, Python will not see the new subtract() function. It uses the cached version already loaded in memory.
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✅ The Right Way to Reload:
import importlib
import mathutils
importlib.reload(mathutils) # Forces Python to reload the updated module
# Now the new function is accessible
print(mathutils.subtract(10, 3)) # ➡️ Output: 7
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🧠 Why Does This Happen?
To improve performance, Python loads modules from disk only once, and then stores them in memory (RAM).
If the module file changes, Python doesn’t detect it unless you explicitly tell it to reload.
📌 Summary:
- Re-importing a module doesn’t reload its changes.
- Use importlib.reload() to reload the updated version from disk.
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https://t.me/DataScienceQ 💯