How to modify last element of Python list in list comprehension?
I have a code segment like following which throws an invalid syntax error:
lst = [0, 0, 0]
new_lst = [lst[-1] = i + 1 for i in range(3)]
Basically, I want new_lst to be list of lists, where every list will be lst but the last element changed. Any ideas how to do this in Python?
python list
edited Nov 14 '18 at 11:51
aydow
2,36011026
asked Aug 20 '18 at 11:09
terettterett
22617
add a comment |
I have a code segment like following which throws an invalid syntax error:
lst = [0, 0, 0]
new_lst = [lst[-1] = i + 1 for i in range(3)]
Basically, I want new_lst to be list of lists, where every list will be lst but the last element changed. Any ideas how to do this in Python?
python list
edited Nov 14 '18 at 11:51
aydow
2,36011026
asked Aug 20 '18 at 11:09
terettterett
22617
1
Assignments are not allowed inside of list comprehensions.
– Klaus D.
Aug 20 '18 at 11:10
add a comment |
I have a code segment like following which throws an invalid syntax error:
lst = [0, 0, 0]
new_lst = [lst[-1] = i + 1 for i in range(3)]
Basically, I want new_lst to be list of lists, where every list will be lst but the last element changed. Any ideas how to do this in Python?
python list
edited Nov 14 '18 at 11:51
aydow
2,36011026
asked Aug 20 '18 at 11:09
terettterett
22617
I have a code segment like following which throws an invalid syntax error:
lst = [0, 0, 0]
new_lst = [lst[-1] = i + 1 for i in range(3)]
Basically, I want new_lst to be list of lists, where every list will be lst but the last element changed. Any ideas how to do this in Python?
python list
python list
edited Nov 14 '18 at 11:51
aydow
2,36011026
asked Aug 20 '18 at 11:09
terettterett
22617
edited Nov 14 '18 at 11:51
aydow
2,36011026
asked Aug 20 '18 at 11:09
terettterett
22617
edited Nov 14 '18 at 11:51
aydow
2,36011026
edited Nov 14 '18 at 11:51
aydow
2,36011026
edited Nov 14 '18 at 11:51
aydow
2,36011026
2,36011026
asked Aug 20 '18 at 11:09
terettterett
22617
asked Aug 20 '18 at 11:09
terettterett
22617
asked Aug 20 '18 at 11:09
terettterett
22617
22617
1
Assignments are not allowed inside of list comprehensions.
– Klaus D.
Aug 20 '18 at 11:10
add a comment |
1
Assignments are not allowed inside of list comprehensions.
– Klaus D.
Aug 20 '18 at 11:10
1
1
Assignments are not allowed inside of list comprehensions.
– Klaus D.
Aug 20 '18 at 11:10
Assignments are not allowed inside of list comprehensions.
– Klaus D.
Aug 20 '18 at 11:10
add a comment |
1 Answer
1
active
oldest
votes
You can only make assignments when they are stand-alone statements I.e. not within a list comprehension. Other examples of this would be in control statements like ifs or fors
In [945]: lst = [0, 0, 0]
In [946]: new_lst = [lst[:-1] + [i + 1] for i in range(3)]
In [947]: new_lst
Out[947]: [[0, 0, 1], [0, 0, 2], [0, 0, 3]]
lst[:-1] takes every element from lst except for the last and [i + 1] will be appended to the end of the list
answered Aug 20 '18 at 11:11
aydowaydow
2,36011026
Thank you, this works.
– terett
Aug 20 '18 at 11:12
@terett if it works and has helped you please upvote and accept the answer. thanks!
– aydow
Aug 27 '18 at 21:17
add a comment |
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1 Answer
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active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
You can only make assignments when they are stand-alone statements I.e. not within a list comprehension. Other examples of this would be in control statements like ifs or fors
In [945]: lst = [0, 0, 0]
In [946]: new_lst = [lst[:-1] + [i + 1] for i in range(3)]
In [947]: new_lst
Out[947]: [[0, 0, 1], [0, 0, 2], [0, 0, 3]]
lst[:-1] takes every element from lst except for the last and [i + 1] will be appended to the end of the list
answered Aug 20 '18 at 11:11
aydowaydow
2,36011026
Thank you, this works.
– terett
Aug 20 '18 at 11:12
@terett if it works and has helped you please upvote and accept the answer. thanks!
– aydow
Aug 27 '18 at 21:17
add a comment |
You can only make assignments when they are stand-alone statements I.e. not within a list comprehension. Other examples of this would be in control statements like ifs or fors
In [945]: lst = [0, 0, 0]
In [946]: new_lst = [lst[:-1] + [i + 1] for i in range(3)]
In [947]: new_lst
Out[947]: [[0, 0, 1], [0, 0, 2], [0, 0, 3]]
lst[:-1] takes every element from lst except for the last and [i + 1] will be appended to the end of the list
answered Aug 20 '18 at 11:11
aydowaydow
2,36011026
Thank you, this works.
– terett
Aug 20 '18 at 11:12
@terett if it works and has helped you please upvote and accept the answer. thanks!
– aydow
Aug 27 '18 at 21:17
add a comment |
You can only make assignments when they are stand-alone statements I.e. not within a list comprehension. Other examples of this would be in control statements like ifs or fors
In [945]: lst = [0, 0, 0]
In [946]: new_lst = [lst[:-1] + [i + 1] for i in range(3)]
In [947]: new_lst
Out[947]: [[0, 0, 1], [0, 0, 2], [0, 0, 3]]
lst[:-1] takes every element from lst except for the last and [i + 1] will be appended to the end of the list
answered Aug 20 '18 at 11:11
aydowaydow
2,36011026
You can only make assignments when they are stand-alone statements I.e. not within a list comprehension. Other examples of this would be in control statements like ifs or fors
In [945]: lst = [0, 0, 0]
In [946]: new_lst = [lst[:-1] + [i + 1] for i in range(3)]
In [947]: new_lst
Out[947]: [[0, 0, 1], [0, 0, 2], [0, 0, 3]]
lst[:-1] takes every element from lst except for the last and [i + 1] will be appended to the end of the list
answered Aug 20 '18 at 11:11
aydowaydow
2,36011026
edited Aug 20 '18 at 11:43
answered Aug 20 '18 at 11:11
aydowaydow
2,36011026
answered Aug 20 '18 at 11:11
aydowaydow
2,36011026
answered Aug 20 '18 at 11:11
aydowaydow
2,36011026
2,36011026
Thank you, this works.
– terett
Aug 20 '18 at 11:12
@terett if it works and has helped you please upvote and accept the answer. thanks!
– aydow
Aug 27 '18 at 21:17
add a comment |
Thank you, this works.
– terett
Aug 20 '18 at 11:12
@terett if it works and has helped you please upvote and accept the answer. thanks!
– aydow
Aug 27 '18 at 21:17
Thank you, this works.
– terett
Aug 20 '18 at 11:12
Thank you, this works.
– terett
Aug 20 '18 at 11:12
@terett if it works and has helped you please upvote and accept the answer. thanks!
– aydow
Aug 27 '18 at 21:17
@terett if it works and has helped you please upvote and accept the answer. thanks!
– aydow
Aug 27 '18 at 21:17
add a comment |
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1
Assignments are not allowed inside of list comprehensions.
– Klaus D.
Aug 20 '18 at 11:10