This question already has answers here:
How do I prepend to a short python list?
(7 answers)
Closed 6 years ago.
Recently I was learning python,and I want to use the function that is opposite of append() function.How can I use the function insert an element in the first position of the list.Thank you!
Prepend doesn't exist, but you can simply use the insert method:
list.insert(0, element)
Related
This question already has answers here:
Access item in a list of lists
(8 answers)
Closed 1 year ago.
stats=[[5,1,4],[3,4,3],[2,3,5]]
I was just wondering how I would select an element and I can't find anything that will help. for example, how would I select the 2 in the last set of numbers
its called 2 dimensional list and below is the way. thanks
stats[2][0]
This question already has answers here:
What algorithm does Python's built-in sort() method use?
(2 answers)
What is `lambda` in Python code? How does it work with `key` arguments to `sorted`, `sum` etc.?
(4 answers)
Understanding the map function
(6 answers)
Closed 1 year ago.
I found the following line of code which I'm unable to google as it has a custom function. Can someone please explain this?
list.sort(key=lambda v: map(int, v.split('.')))
I know this sorts a list but I want to understand which sort is it and how it works.
This question already has answers here:
How to get first AND last element of tuple at the same time
(4 answers)
Closed 1 year ago.
Is there a function in Python to do it?
I have tried printing out last item in the tuple, but each time I want to generate more strings, I have to change it manually.
Try tuple_name[-1]
replace tuple_name with your tuple name
finally, it will be like print(tuple_name[-1])
This question already has answers here:
Python list sort in descending order
(6 answers)
Closed 5 years ago.
This is my code:
#这是一个有关旅行的程序
place=['北京天安门','西安兵马俑','香港游乐园','日本秋叶原']
print(place)
print(sorted(place))
print(place)
place.sorted(reverse=true)
print(place)
When I run my code, something Wrong happens.
place.sorted(reverse=true)
or
sorted(place)
Using the 2nd way, how can I give (reverse=true)?
Just use sorted(place, reverse=True).
This question already has answers here:
How to extract parameters from a list and pass them to a function call [duplicate]
(3 answers)
Closed 7 years ago.
I have a parameter list which is just inputs separated by commas.
Now that I have a non-empty list, myList[], how do I turn the entries of L into a parameter list?
Example: if want
myList[0], myList[1], myList[2]..., myList[10]
How can I do that? Thank you! Is there anything similar to unpacking?
You can use unpacking with *.
f(*myList)