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Start your free trialGautam Basu
206 PointsWhy cannot I write str_var.len()?
In your tutorial you have mentioned that everything in Python is Object , so in order to get some ability of the Object we should use . and then the method name with parenthesis.
If that is true then when I tried to execute str_var.len() instead of len(str_var), why did I get the following error?
quote.len() Traceback (most recent call last): File "<stdin>", line 1, in <module> AttributeError: 'str' object has no attribute 'len'
2 Answers
Philip Schultz
11,437 PointsHey Gautam, Check out this stackoverflow post. I think this answers your question.
https://stackoverflow.com/questions/28703834/why-do-some-methods-use-dot-notation-and-others-dont
Philipp Rรคse
Courses Plus Student 10,298 Points
len()
is a Built-In Python Function
but things like my_string.add()
are methods of the String-Class.
The difference between methods and functions are explained in later videos.
Craig Dennis shows the documentation of the String-Class and the relating methods, mentioned inside the documentation. He skips it to avoid confusion on such an early stage of getting in touch with Python.
len(s)
Return the length (the number of items) of an object. The argument may be a sequence (such as a
string
,bytes
,tuple
,list
, orrange
) or a collection (such as adictionary
,set
, orfrozen set
).
I hope my answer helps you. :)
Sincerely,
Phil
For further information please follow the link above to the Python documentation.