# 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

```python
if uploaded_file is not None:
```

- `if` checks a condition.
- `uploaded_file` is a variable that holds the uploaded file.
- `is not None` checks that the variable contains a value rather than `None`.

**Purpose:** Run code only when a file has been uploaded.

## 2\. Use `try` to run code safely

```python
try
```

- `try` contains 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

```python
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

```python
if uploaded_file is not None:
    try:
        # Your code goes here
    except Exception:
        # Error handling goes here
```

---

This mini-guide was originally published on [**<u>PDF Python Hub</u>**](https://payhip.com/PDFPythonHub), where you can find more in-depth Python resources for working with PDFs.