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Commit 513b6762 authored by vermeul's avatar vermeul
Browse files


parent 95951a78
......@@ -62,6 +62,34 @@ It is not very elegant and adds unecessary infrastructure code into your functio
See also:
## Use an empty list or a dictionary to implement a state variable
An exception of the rule above is when you need to implement a state variable. A state variable is a permanent store of a value the first time a method or function gets executed. Here is an example for a password store which can only be executed by an inner method. This can be useful if you need the password later for reconnect to a server, without giving the possibility to easily get the cleartext password:
import inspect
class PW():
def get_password_via_internal_method(self, *args, **kwargs):
return self.password(*args, **kwargs)
def password(self, password=None, pstore={} ):
if password is not None:
pstore['password'] = password
if inspect.stack()[1][3] == 'get_password_via_internal_method':
return pstore.get('password')
raise Exception("Not allowed!")
# later
pw = PW()
pw.get_password_via_internal_method() # returns the password
pw.password() # will throw an Exception
## Use docstrings to comment your code
* Classes, functions and methods should have doctrings
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