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Understanding the "is" operator [duplicate]
(11 answers)
Closed 9 months ago.
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What is the difference between the is keyword and the == operator in Python? Why would a programmer need to use one over the other depending on the situation?
The == operator compares the value or equality of two objects, whereas the Python is operator checks whether two variables point to the same object in memory.
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What do double parentheses mean in a function call? e.g. func(foo)(bar)
(3 answers)
What is first class function in Python
(8 answers)
Closed 29 days ago.
My question is to identify the role of ()().
c1 = conv... #omit to explain below c1 = tf.kears.layers.Dropout(0.1)(c1)
I know that the role of (c1) is input for next layer. However, I'm curious about other function of the syntax: ()() in other place.
Can you explain it similar to the role by using bracket after bracket?
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What is the '#=' symbol for in Python?
(3 answers)
What does the "at" (#) symbol do in Python?
(14 answers)
Closed 3 years ago.
I have come across this code and I have seen this unusual operation:
return Xtrain # eigenvectors[:2]
Does anyone know what it does?
Python documentation says:
Matrix Multiplication
Operator
a # b
Function
matmul(a, b)
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How can I get the next string, in alphanumeric ordering, in Python?
(4 answers)
Closed 6 years ago.
If Python has an implementation of Ruby's next method? I mean something what works exactly the same as in Ruby, so if I type e.g. "z".next it will return "aa" (instead of just next sign in ascii table), "az".next will return "ba" and so on.
I don't believe there is a built-in method for this in Python. A similar question was asked on How can I get the next string, in alphanumeric ordering, in Python? and the accepted answer gives a solution.
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What does `<>` mean in Python?
(5 answers)
Closed 8 years ago.
I just saw some code using the <> operator (don't know what this is called) instead of the != operator in Python. Is there any difference between the two or do they mean the same thing? What's the <> operator called? Thanks.
The <> operator is considered obsolete:
https://docs.python.org/2/reference/expressions.html#not-in
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Understanding slicing
(38 answers)
Closed 9 years ago.
I am new to python. Please anybody explain the following string operations
s="abcdefghijklmnop"
print s[:6][::-1] #is it first calculating s[:6] and then operating the result with [::-1] ?
"abcdefghijklmnop"[:6][::-1]
Take first 6 characters (abcdef).
Read the result from the end to the beginning (fedcba).
There is an other better way to get this result:
"abcdefghijklmnop"[5::-1]