How to switch position of two items in a Python list?
I haven’t been able to find a good solution for this problem on the net (probably because switch, position, list and Python are all such overloaded words).
list
How can I convert a dictionary into a list of tuples?
If I have a dictionary like:
In Python, what is the difference between “.append()” and “+= []”?
What is the difference between:
Variable assignment and modification (in python)
When I ran this script (Python v2.6): a = [1,2] b = a a.append(3) print a >>>> [1,2,3] print b >>>> [1,2,3] I expected print b to output [1,2]. Why did b get changed when all I did was change a? Is b permanently tied to a? If so, can I make them independent? How? … Read more
Creating a list of dictionaries results in a list of copies of the same dictionary
I want to get all the iframe from a webpage.
python; modifying list inside a function
Suppose I have function with list parameter, and inside its body I want to modify passed list, by copying elements of an array to the list:
Python find elements in one list that are not in the other
I need to compare two lists in order to create a new list of specific elements found in one list but not in the other. For example: main_list=[] list_1=["a", "b", "c", "d", "e"] list_2=["a", "f", "c", "m"] I want to loop through list_1 and append to main_list all the elements from list_2 that are not … Read more
What makes sets faster than lists?
The python wiki says: “Membership testing with sets and dictionaries is much faster, O(1), than searching sequences, O(n). When testing “a in b”, b should be a set or dictionary instead of a list or tuple.”
How to perform element-wise multiplication of two lists?
I want to perform an element wise multiplication, to multiply two lists together by value in Python, like we can do it in Matlab.
a mutable type inside an immutable container
I’m a bit confused about modifying tuple members. The following doesn’t work: