django-passwords is a reusable app that provides a form field and validators that check the strength of a password.

You can install django-passwords with pip by typing:

pip install django-passwords

Or with easy_install by typing:

easy_install django-passwords

Or manually by downloading a tarball and typing:

python setup.py install

django-passwords adds 6 optional settings

Optional:

Specifies that no space characters in the password (default False):

PASSWORD_WITHOUT_WHITESPACES = True

Specifies minimum length for passwords:

PASSWORD_MIN_LENGTH = 6 # Defaults to 6

Specifies maximum length for passwords:

PASSWORD_MAX_LENGTH = 120 # Defaults to None

Specifies the location of a dictionary (file with one word per line):

PASSWORD_DICTIONARY = "/usr/share/dict/words" # Defaults to None

Specifies how close a fuzzy match has to be to be considered a match:

PASSWORD_MATCH_THRESHOLD = 0.9 # Defaults to 0.9, should be 0.0 - 1.0 where 1.0 means exactly the same.

Specifies a list of common sequences to attempt to match a password against:

PASSWORD_COMMON_SEQUENCES = [] # Should be a list of strings, see passwords/validators.py for default

Specifies number of characters within various sets that a password must contain:

PASSWORD_COMPLEXITY = { # You can ommit any or all of these for no limit for that particular set
    "UPPER": 1,       # Uppercase
    "LOWER": 1,       # Lowercase
    "DIGITS": 1,      # Digits
    "PUNCTUATION": 1, # Punctuation (string.punctuation)
    "NON ASCII": 1,   # Non Ascii (ord() >= 128)
    "WORDS": 1        # Words (substrings seperates by a whitespace)
}

To use the formfield simply import it and use it:

from django import forms
from passwords.fields import PasswordField

class ExampleForm(forms.Form):
    password = PasswordField(label="Password", validate_url=reverse_lazy('password_validator'))

You also need to add the url to the base application url.py:

# urls.py base file
urlpatterns = patterns('',
        url(r'^your_any_url/', include('passwords.urls')),
)