Kinh Nghiệm về Python recursion append to list 2022
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I want to append to a list recursively but I cannot come up with a function that works. The function takes two arguments times and data. times should be the number of times to append the data.
Nội dung chính
- How do you add elements to a recursion list in Python?How do you implement a recursive function in python?What is recursion example?
Here is my code so far:
def replicate_recur(times, data):
result2 = []
if times == 0:
result2.append(data)
else:
result2.append(data)
replicate_recur(times – 1, data)
return result2
MSeifert
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asked Feb 22, 2022 9:54
4
You could use a intermediate list to append to in each recursive call. That avoids these redefinition problems you’re encountering currently:
def replicate_recur(times, data, result=None):
if result is None: # create a new result if no intermediate was given
result = []
if times == 1:
result.append(data)
else:
result.append(data)
replicate_recur(times – 1, data, result) # also pass in the “result”
return result
When called:
>>> replicate_recur(4, 2)
[2, 2, 2, 2]
answered Feb 22, 2022 10:06
MSeifertMSeifert
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To make your code work, you need to extend the
list in the current execution with the output of the next recursive call. Also, the lowest depth of the recursion should be defined by times = 1:
def replicate_recur(times, data):
result2 = []
if times == 1:
result2.append(data)
else:
result2.append(data)
result2.extend(replicate_recur(times – 1, data))
return result2
On another note, you can simply replicate your list with:
def replicate(times, data):
return [data]*times
Adirio
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answered Feb 22, 2022 10:00
Moses KoledoyeMoses Koledoye
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2
You can use xrange for this, there is no point to use recursion unless it is a coding test.
def replicate(times, data):
result2 = []
for i in xrange(times):
result2.append(data)
return result2
Same function can be written in a
recursive way like this:
def replicate_recur(times, data, listTest=None):
# If a list has not been passed as argument create an empty one
if(listTest == None):
listTest = []
# Return the list if we need to replicate 0 more times
if times == 0:
return listTest
# If we reach here least we have to replicate once
listTest.append(data)
# Recursive call to replicate more times, if needed and return the result
replicate_recur(times-1, data, listTest)
return listTest
Adirio
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badges25 bronze badges
answered Feb 22, 2022 9:58
3
Because your redefining result2 everytime. Keep result2 outside the function and it should work.
Also you could consider doing data*times to replicate if data is a list or simply do
(result2.append(data))*times
answered Feb 22, 2022 9:58
Abhishek JAbhishek J
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1
In the
recursion, each time replicate_recur is called, a fresh result2 in new name space is created.
[data] * times
Would do what you are trying to achieve.
Rahul K P
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answered Feb 22, 2022 10:04
2
How do you add elements to a recursion list in Python?
sum number in a list python using recursion. def listsum(numList):. if len(numList) == 1:. return numList[0]. return numList[0] + listsum(numList[1:]). print(listsum([1,3,5,7,9])).
How do you implement a recursive function in python?
Python also accepts function recursion, which means a defined function can call itself. Recursion is a common mathematical and programming concept. It means that a function calls itself. This has the benefit of meaning that you can loop through data to reach a result.
What is recursion example?
Recursion is the process of defining a problem (or the solution to a problem) in terms of (a simpler version of) itself. For example, we can define the operation “find your way home” as: If you are home, stop moving. Take one step toward home.
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