Getting Started with Anvil: TypeError: __init__() takes exactly 1 arguments (2 given)

Anvil Q&A
1

I’m following the Getting Started with Anvil Guest List Tutorial and ran into an error I can’t seem to correct:

TypeError: init() takes exactly 1 arguments (2 given)
at Form1, line 38
called from Form1, line 50

It happened when I changed my update_previous_signatures function. Here’s my code:

from anvil import *
import google.auth, google.drive, google.mail
from google.drive import app_files

# Import the RowTemplate class, which is 
# defined by the RowTemplate form.
# We can use it like any other component.
from RowTemplate import RowTemplate

# Importing google.drive allows us to connect to
# our linked spreadsheet.
import google.drive

class Form1(Form1Template):
  def btn_greet_click (self, sender, **event_args):
    # This method is called when the button is clicked
    user_name = self.txt_name.text
    msg = self.txt_message.text
    
    # Adding another row to a spreadsheet is simple
    self.guest_sheet.add_row(name=user_name, message=msg)
    self.update_previous_signatures()    
  
  def update_previous_signatures(self):
    # First, we clear out all components from the LinearPanel,
    # so it's completely empty.
    self.first_visitors.clear()

    # Now, we add a Label to the panel for each row
    # in the spreadsheet.
    #for row in self.guest_sheet.list_rows():
      #row_label = Label(text=row["name"])
      #self.first_visitors.add_component(row_label)
      
    # Replacing the above for loop with the one below 
    # to allow instantaneous page updates  
    for row in self.guest_sheet.list_rows():
      row_form = RowTemplate(row)
      self.first_visitors.add_component(row_form)

  def __init__(self, **properties):
    # You must call self.init_components() before doing anything else in this function
    self.init_components(**properties)

    # Set "self.guest_sheet" to the first
    # worksheet of your spreadsheet.
    self.guest_sheet = google.drive.app_files.guest_book.worksheets[0]

    # Start off by loading previous messages
    self.update_previous_signatures()
    
  def label_1_show (self, **event_args):
    # This method is called when the Label is shown on the screen
    pass

and the code from RowTemplate:

from anvil import *
import google.auth, google.drive, google.mail
from google.drive import app_files

class RowTemplate (RowTemplateTemplate):
  def __init__(self, **properties):
    # You must call self.init_components() before doing anything else in this function
    self.init_components(**properties)

    # Save a reference to the row object for later
    self.sheet_row = row
    
    # Display the text and message
    self.lbl_name.text = row["name"]
    self.lbl_message.text = row["message"]

Where am I adding that second argument? Or how can I accept two arguments?

2

Hi Chris,

The “row” parameter needs to be added to the __init__ method of the RowTemplate form:

...

class RowTemplate (RowTemplateTemplate):
  def __init__(self, row, **properties):
    # You must call self.init_components() before doing anything else in this function
    self.init_components(**properties)
  
  ...

Now when you create instances of RowTemplate, you can pass in the row you’re interested in without any issues.

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