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+--- Thread: Uncanny line of code in Torchat source file (/thread-15123.html)
Uncanny line of code in Torchat source file - pkm - Jan-05-2019
I have been sifting through Torchat's sourcecode, which is available on github: https://github.com/prof7bit/TorChat
I don‘t understand one line of code within the config.py file, in the get(section, option) method, that is.
def get(section, option):
if not config.has_section(section):
config.add_section(section)
if not config.has_option(section, option):
value = config_defaults[section, option]
set(section, option, value)
value = config.get(section, option)
if type(value) == str:
try:
value = value.decode("UTF-8")
value = value.rstrip(" \"'").lstrip(" \"'")
except:
print "*** config file torchat.ini is not UTF-8 ***"
print "*** this will most likely break things ***"
elif type(value) == int:
value = str(value)
elif type(value) == float:
value = str(value)
return value # this should now be a unicode stringvalue = config_defaults[section, option] assigns a valu to the value variable, and evidently, this value is taken from the config_defaults dictionary:config_defaults = {
("tor", "tor_server") : "127.0.0.1",
("tor", "tor_server_socks_port") : 9050,
("tor", "tor_server_control_port") : 9051,
("tor_portable", "tor_server") : "127.0.0.1",
("tor_portable", "tor_server_socks_port") : 11109,
("tor_portable", "tor_server_control_port") : 11119,
...
("profile", "text") : "",
} It is not normally possible to get a value from a python dictionary like this: config_defaults[section, option], is it? I haven't been able to figure out what the line of code in question does or how it is supposed to work. Can anyone gve me a hint?
RE: Uncanny line of code in Torchat source file - buran - Jan-05-2019
config_defaults is a dict that has tuples as keys.And in this line
value = config_defaults[section, option] section, option part is implicit tuple, so it's a valid code, effectively the same as value = config_defaults[(section, option)].from the docs:
Quote:output tuples are always enclosed in parentheses, so that nested tuples are interpreted correctly; they may be input with or without surrounding parentheses, although often parentheses are necessary anyway (if the tuple is part of a larger expression).
>>> foo = 'spam', 'eggs'
>>> foo
('spam', 'eggs')
>>> type(foo)
<class 'tuple'>
>>> also, another example:some_dict = {(1, 2):'one',
(3, 4):'two'}
print(some_dict[1, 2])
RE: Uncanny line of code in Torchat source file - pkm - Jan-05-2019
Now I understand. thank you!