How do I check if any entry boxes are empty in Tkinter?

Question

I am making a GUI in Tkinter with Python 2.7. I have a frame with about 30 entry boxes among other things. I don't have access to the code right now, but is there a way to check if any or several of the boxes are empty so I can warn the user and ask them if they want to proceed?

Is there a way to go through each of them with a 'for' loop and check the length of each entry. Or is there a command to check if any box is empty?

Answer 1

You can get the content of the entry using Tkinter.Entry.get method.

Check the length of the entry using len function and get method:

if len(entry_object.get()) == 0:  # empty!
    # do something

or more preferably:

if not entry_object.get(): # empty! (empty string is false value)
    # do something

---

Use for loop to check several entry widgets:

for entry in entry_list:
    if not entry_object.get():
        # empty!

You should populate entry_list beforehand.

Manually:

entry_list = []

entry = Entry(...)
...
entry_list.append(entry)

entry = Entry(...)
...
entry_list.append(entry)

or, using winfo_children method (to get all entries):

entry_list = [child for child in root_widget.winfo_children()
              if isinstance(child, Entry)]