Is there any way to change data type of each item of a list in Python?

user_7047037 0
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I have a listof lists named listlog with this structure:

[['2022-05-04 11:06:50', 'INFO', 'Database Connection', 'Database', '10.05', 'NULL'] [...]

Is there any way to change each item data type? The first one would be timestamp/datetime, the scond, third and fourth would be string, the fith would be float or numeric.

Is there any way? I've tested something like this, but didn't work

map(lambda item: Timestamp([item[0]]), listLog)
list python types
4 Answers

You should be able to do it with something like the following:

for item in listlog:
    item[0] = Timestamp(item[0])
    item[4] = float(item[4])

Add an additional assignment for each data field that you need to convert.

Greg_Hewgill_8930

You can try something like this.

from datetime import datetime
for item in listdata:
        item[0]=datetime.strptime(item[0], '%Y-%M-%d %H:%m:%S')
        item[1]=str(item[1])
        item[2]=str(item[2])
        item[3]=str(item[3])
        item[4]=float(item[4])

print(listt)
user_129422840

While I think Greg Hewgill's solution is the best practice, here is an answer using a map if you're interested in oneliners:

 list(map(lambda item: [Timestamp(item[0])] + item[1:4] + [float(item[4])] + item[5:], listlog))
user_165161140 
for i in range(0,len(list_name)):
     # check condition of the item whether its a string or integer or date-time stamp then do typecasting.

for example : if type(l[item])=int and you want to convert it to string then write:

l[item] = string(l[item])
user_190328040
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