I have a function where I can read out my csv file. In my csv I have the following 2 information. the studentnumber and when the student passed the exam. I need to know which students have passed the exam in less then 4 weeks. How could I compare these 2 with eachother? the dates that I have in my csv file looks something like this: 21-10-2020 15:20
row[0] = studentsname
row[12] = passed date
I have tried doing something like this where I compare row[12] with the end_date but then I get an error message saying this
Error code:
'<' not supported between instances of 'str' and 'datetime.datetime'
My code:
from datetime import datetime
end_date = datetime(day=5, month=10, year=2020, hour=23, minute=59)
fastStudent = []
allPassedStudents = []
with open("Mycsv_file, 'r') as read_obj:
csv_dict_reader = csv.reader(read_obj, delimiter=';')
for row in csv_dict_reader:
if row[12]:
allPassedStudents.append(row[0])
if row[12] < end_date:
fastStudent.append[row[0]]
print(fastStudent)
You are comparing variables that are of different types. To compare a string to a date you must convert one to a date or the other to a string. In this case you want to convert it to a date
from datetime import datetime
date_string = '2021-12-31'
datetime = datetime.strptime(date_string, '%Y-%m-%d')
print(datetime)
datetime documentation for other string formats
That's because row[12] is a str
, not datetime
.
need to change a type of row[12] to datetime, using datetime.strptime . In this case, you shoud use a format '%d-%m-%Y %H:%M' for '21-10-2020 15:20', for example.
fastStudent.append[row[0]]
-> need to be changed to fastStudent.append(row[0])
.
import csv
from datetime import datetime
end_date = datetime(day=5, month=10, year=2020, hour=23, minute=59)
fastStudent = []
allPassedStudents = []
with open("Mycsv_file", 'r') as read_obj:
csv_dict_reader = csv.reader(read_obj, delimiter=';')
for row in csv_dict_reader:
print(row)
passedDate = datetime.strptime(row[12], '%d-%m-%Y %H:%M') # to convert a type of row[12] to datetime type, to enable it comparable!
if passedDate:
allPassedStudents.append(row[0])
if passedDate < end_date:
fastStudent.append(row[0]) # -> I changed [] to ()
print(fastStudent)
# ['Tommy'] (for exmample)
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