CODEWITHSUNDEEP
python
std
std

Reputation: 963

What do these parameter definitions mean in python?

Many different representation of parameters in python such as :

urllib2.urlopen(url[, data][, timeout])

urllib2.build_opener([handler, ...])

cookielib.MozillaCookieJar(filename, delayload=None, policy=None)


urllib2.urlopen(url[, data][, timeout])

and

urllib2.urlopen(url,data,timeout)

Does the first one means all the url ,data and timeout can be passed as list?

Upvotes: 0

Views: 255

Answers (2)

Ignacio Vazquez-Abrams
Ignacio Vazquez-Abrams

Reputation: 798686

I know that the parameter in second method is a list

This is incorrect. Square brackets in command/function documentation denote optional parameters. Note that in Python order of parameters does matter, so you'll need to use keyword arguments to omit parameters in the middle.

urllib2.urlopen(someurl, somedata, sometimeout)
urllib2.urlopen(someurl)
urllib2.urlopen(someurl, somedata)
urllib2.urlopen(someurl, timeout=sometimeout)

urllib2.build_opener()
urllib2.build_opener(handler1)
urllib2.build_opener(handler1, handler2)
urllib2.build_opener(handler1, handler2, handler3)

Upvotes: 5

Jon Clements
Jon Clements

Reputation: 142156

It's standard notation for optional arguments... ie you may pass data, optionally followed by timeout, or as you have its name, pass timeout without data using timeout=...

Upvotes: 2

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