Build a password generator by writing a function named
pwgen taking the following
length: the length of the generated password
with_digits: Defaulting to True, to allow or disallow digits
with_uppercase: Defaulting to True, to allow or disallow capital letters
pwgen returns a password with lowercase letters AND digits
with_digits == True AND uppercase letters if
with_uppercase == True.
When asked for a password with multiple character categories,
all categories have to be represented.
For instance, with
with_digits == True, the password must have at least one
lowercase letter AND at least one digit.
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