Python if uploaded_file is not None, try, and except Exception Explained
These Python statements are commonly used when handling uploaded files, especially in applications built with Streamlit.
1. Check whether a file was uploaded
if uploaded_file is not None:
ifchecks a condition.uploaded_fileis a variable that holds the uploaded file.is not Nonechecks that the variable contains a value rather thanNone.
Purpose: Run code only when a file has been uploaded.
2. Use try to run code safely
try
trycontains code that Python attempts to execute.- If the code succeeds, Python continues normally.
- If an exception occurs, Python can move to an except block.
Purpose: Handle operations that might fail, such as reading or processing a file.
3. Use except Exception to handle errors
except Exception:
except= handles an error.Exception= specifies which category of errors to catch.
Purpose: Handle errors that occur during execution.
4. Combine all three
if uploaded_file is not None:
try:
# Your code goes here
except Exception:
# Error handling goes here
This mini-guide was originally published on PDF Python Hub, where you can find more in-depth Python resources for working with PDFs.
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