---
title: len()
tags:
  - python
  - functions
  - strings
aliases:
  - len
  - length
  - string-length
---

> [!note] Concept  
> The `len()` function returns the number of characters in a string (including spaces and punctuation).
> 
> > [!example] Example  
> > ```python
> > len('hello')                                # 5
> > len('My very energetic monster just scarfed nachos.')  # 46
> > len('')                                     # 0
> > 
> > name = "Alice"
> > print("The length of your name is:")
> > print(len(name))                            # 5
> > ```
> 
> > [!important] Best Practices  
> > - `len()` always returns an integer.  
> > - You must convert the result to a string when concatenating:
> > ```python
> > print("I am " + str(29) + " years old.")  # OK
> > ```
> > - Mixing integers and strings with `+` will raise a `TypeError`.
> 
> > [!info] Related Notes  
> > [[functions]]  
> > [[typeConversions]]  
> > [[expressions]]  
> > [[pythonSyntaxOverview]]