# Python Shlex Module

The `shlex` module makes it easy to write lexical analyzers for simple syntaxes resembling that of the Unix shell. This is often used for splitting command strings for `subprocess`.

## Importing the Module

```python
import shlex
```

## Splitting Strings

The `shlex.split()` function splits a string into a list of tokens, using shell-like syntax. This is useful when you want to process a command line string.

```python
import shlex

command_line = 'ls -l "some file with spaces.txt"'
args = shlex.split(command_line)

print(args)
# Output: ['ls', '-l', 'some file with spaces.txt']
```

This is safer and more correct than using `string.split()` because it handles quoted strings correctly.

## Quoting Strings

The `shlex.quote()` function returns a shell-escaped version of the string `s`. The returned value is a string that can safely be used as one token in a shell command line.

```python
import shlex

filename = 'some file; rm -rf /'
command = f"ls -l {shlex.quote(filename)}"

print(command)
# Output: ls -l 'some file; rm -rf /'
```

## Joining Tokens

The `shlex.join()` function concatenates the tokens of the list `split_command` and returns a string. This is the inverse of `split()`.

*Note: Added in Python 3.8.*

```python
import shlex

args = ['echo', 'Hello', 'World!']
command = shlex.join(args)

print(command)
# Output: echo Hello 'World!'
```

[[programming/python/python]]