# bool() function in Python

## Introduction

The `bool()` function converts a value to Boolean (`True` or `False`). If no value is passed to it, it returns `False`.

The syntax of `bool()` function is:

```python
bool([value])
```

where **value** can be integers, sequence, mapping, etc.

## Return Values

`bool()` function returns `True` if **value** is true, whereas `False` if **value** is false or no value is passed.

The following values are considered `False` in Python:

*   `None`
*   `False`
*   Zero of any numeric type. For example, `0`, `0.0`, `0j`
*   Empty sequence. For example, `()`, `[]`, `''`.
*   Empty mapping. For example, `{}`
*   objects of Classes that has `__bool__()` or `__len()__` method which returns `0` or `False`

All other values except these values are considered `True`.

## Example

```python
value = [] # Empty List
print(bool(value))

value = [0] # List with one element
print(bool(value))

value = 0.0 # Floating point number 0
print(bool(value))

value = None # None
print(bool(value))

value = True # Boolean True
print(bool(value))

value = 'non-empty string' # Non-Empty String
print(bool(value))

value = ''
print(bool(value)) # Empty String
```

Output:

```bash
False
True
False
False
True
True
False
```

## Conclusion

In this part, we learned about the Python `bool()` function with the help of examples.