Python: "object' does not match format '%Y-%W-%w'"

Question

I am working with Python in Spotfire and am trying to convert fiscal weeks to the date of the Monday of the input fiscal week.

I have attempted to implement the solution provided here to no avail. My script is as follows:

import datetime
d= datetime.datetime.strptime(str(fw), "%Y-%W-%w")

Input values look like the values below:

Input
2023-06-1
2023-08-1
2023-13-1
2023-12-1

The full text of the error is below:

Could not execute function call 'date_from_fw'


Error executing Python script:

ValueError: time data '0        2021-17-1n1        2023-11-1n2        2023-12-1n3        2021-24-1n4        2022-39-1n           ...    n82248    2024-09-1n82249    2024-10-1n82250    2022-45-1n82251    2022-33-1n82252    2022-33-1nName: fiscal_week_str, Length: 82253, dtype: object' does not match format '%Y-%W-%w'

Traceback (most recent call last):
  File "data_function.py", line 333, in _execute_script
    exec(compiled_script, self.globals)
  File "<data_function>", line 2, in <module>
  File "_strptime.py", line 577, in _strptime_datetime
    tt, fraction, gmtoff_fraction = _strptime(data_string, format)
  File "_strptime.py", line 359, in _strptime
    (data_string, format))



   at Spotfire.Dxp.Data.DataFunctions.Executors.LocalPythonFunctionClient.<RunFunction>d__8.MoveNext()
   at Spotfire.Dxp.Data.DataFunctions.Executors.PythonScriptExecutor.<ExecuteFunction>d__11.MoveNext()
   at Spotfire.Dxp.Data.DataFunctions.DataFunctionExecutorService.<ExecuteFunction>d__8.MoveNext()

Asked By: igeis

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Source

Answer 1

Found a solution without using the strptime function. This is assuming a column series input with fiscal week values formatted as ‘YYYY-WW’.

import datetime
import pandas as pd

# fw is input in format 'YYYY-WW' 
# Add weekday number to string 1 = Monday
fw = fw + '-1'
# dt is output column 
# Use %G-%V-%w if input is in ISO format
dt = pd.to_datetime(fw, format='%Y-%W-%w', errors='coerce')

Answered By: igeis

Python: "object' does not match format '%Y-%W-%w'"

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