“datetime”类型的参数不能分配给“str”类型的参数“value”

Question

I am currently working on a Python and SQL project.

There I am building a GUI that takes information from user input and stores them in a MySQL database locally.

There are a few warnings/errors that I am trying to resolve.

This is my code

Annotated the error-raising lines by comments.

elif (x == "Learn Python The Hard Way"):
    self.book_id_var.set("Book Id: 2")
    self.book_title_var.set("Learn Python The Hard Way")
    self.book_author_var.set("Zde A. Sham")

    d1 = datetime.datetime.today()
    d2 = datetime.timedelta(days = 15)
    d3 = d1 + d2

    self.date_borrowed_var.set(d1) # Argument of type "datetime" cannot be assigned to parameter "value" of type "str" in function "set", "datetime" is incompatible with "str"

    self.date_due_var.set(d3) # Argument of type "datetime" cannot be assigned to parameter "value" of type "str" in function "set", "datetime" is incompatible with "str"

    self.days_on_book_var.set("15")
    self.late_return_fine_var.set("Rs.25")
    self.date_over_due_var.set("NO")
    self.final_price_var.set("Rs.725")

In line 10 and 13, d1 and d3 are throwing the error commented. Unfortunately, I am not able to find solution to it.

Can I ignore "datetime" is incompatible with "str" , and if not, what would be a workaround?

Answer 1

In order to cast your datetime object to string you can call the.strftime method builtin to the datetime package

eg use:

d3.strftime("%d.%m.%y")

instead of just

d3

same goes for d1 - ("%d.%m.%y") represents the format in which your datetime is being represented.

Results would look like this:

self.date_borrowed_var.set(d1.strftime("%d.%m.%y"))
self.date_due_var.set(d3.strftime("%d.%m.%y"))