In Python, the assignment operator (`=`) is not an expression but a statement. This means it does not return a value, so using it inside expressions (like `if` or `while` conditions) will cause a SyntaxError.
## **1. Incorrect Usage of `=` in Expressions (SyntaxError)**
```python
if (x = 10): # ❌ SyntaxError
print(x)
```
🔴 **Error Output:**
```
SyntaxError: invalid syntax
```
✅ **Fix:** You must assign `x` outside the `if` condition.
```python
x = 10
if x > 5:
print(f"x is {x}") # ✅ Works correctly
```
For more details, see Why Can’t the Assignment Operator (=) Be Used in Expressions in Python?