How to solve the error 'list assignment index out of range' in python

Question

I try to store the number of weekofyear from the list of data named date_range which stored the data such as

date_range[1] = DatetimeIndex(['2020-03-02', '2020-03-03', '2020-03-04', '2020-03-05',
               '2020-03-06', '2020-03-07', '2020-03-08', '2020-03-09',
               '2020-03-10', '2020-03-11', '2020-03-12', '2020-03-13',
               '2020-03-14', '2020-03-15', '2020-03-16', '2020-03-17',
               '2020-03-18', '2020-03-19', '2020-03-20', '2020-03-21',
               '2020-03-22', '2020-03-23', '2020-03-24', '2020-03-25',
               '2020-03-26', '2020-03-27', '2020-03-28', '2020-03-29',
               '2020-03-30', '2020-03-31', '2020-04-01', '2020-04-02',
               '2020-04-03', '2020-04-04', '2020-04-05'],
              dtype='datetime64[ns]', freq='D')

by using the following code

weeknumber= [] 
for i in range(28): 
    for j in range(35):
        weeknumber[i][j] = pd.Timestamp(date_range[i][j]).weekofyear

However,the IDE show the error 'list assignment index out of range'. How to solve this problem ?

Does this answer ur question: stackoverflow.com/questions/64552247/… — Sushil
– Sushil, Commented Oct 29, 2020 at 3:15

fountainhead · Accepted Answer · 2020-10-30 06:25:05Z

1

Use this:

weeknumber = []
for i in range(28):
    weeknumber.append([])
    for j in range(35)):
        weeknumber[i].append(pd.Timestamp(date_range[i][j]).weekofyear)

For an explanation of why you get surprising results to your other approach, refer to this answer to your other question

answered Oct 30, 2020 at 6:25

fountainhead

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Comments

Logan · Accepted Answer · 2020-10-29 03:18:33Z

1

When your list is empty in python you can not assign value to unassigned index of list. so you have 2 options here:

Use append like : list.append(value)
make a loop to assign a value to your list before your main for. Like below:

i = 0 
while ( i < index_you_want):
    list[i] = 0
...
#here your main code

answered Oct 29, 2020 at 3:18

Logan

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