i am new to Python + tkinter
I am trying to enter values into a text widget using FOR loop
The problem is, text widget not showing anything during For loop execution. When for loop finishes, it shows all values.
How can I show inserted values during for loop.
See last line of code
for item in liList:
listDict = {}
# get a tag href
listATag = item.find_all("a", attrs={"class": "product-image"})[0]
listATagHref = listATag['href']
listDict["purchaseLink"] = listATagHref
imgPageRequest = requests.get(listATagHref)
imgPageData = imgPageRequest.text
imgPageSoup = BeautifulSoup(imgPageData, 'lxml')
try:
productImgDiv = imgPageSoup.find_all('div', attrs={"class": "product-image"})[0]
imgATag = productImgDiv.find_all('a')[0]['href']
largeThumbFileName = (imgATag.split('/')[-1])
tempImgNameList.append(largeThumbFileName)
print(listATagHref)
textBox.insert(END,listATagHref+'\n')
etc...
You need to call update on the widget you are adding new data to, for it to refresh and show the new values after each iteration. This is as the Tk mainloop will normally catch the new information on your widget and update it, but when you are in a loop such as this, it cannot check until after the loop is finished.
If root is what you define to be Tk(), then you can call root.update(), or on the actual widget itself. This would go at the end of your for loop.
aside from updating the window, or the text widget you can change the first argument of your textbox from END to INSERT.
import tkinter as tk
# inside the try block change the first argument to INSERT
textBox.insert(tk.INSERT,listATagHref+'\n')
Related
I am working on an editable tkinter.ttk.Treeview subclass. For editing I need to place the edit widget on top of a choosen "cell" (list row/column). To get the proper coordinates, there is the Treeview.bbox() method.
If the row to be edited is not in view (collapsed or scrolled away), I cannot get its bbox obviously. Per the docs, the see() method is meant to bring an item into view in such a case.
Example Code:
from tkinter import Tk, Button
from tkinter.ttk import Treeview
root = Tk()
tv = Treeview(root)
tv.pack()
iids = [tv.insert("", "end", text=f"item {n}") for n in range(20)]
# can only get bbox once everything is on screen.
n = [0]
def show_bbox():
n[0] += 1
iid = iids[n[0]]
b = tv.bbox(iid)
if not b:
# If not visible, scroll into view and try again
tv.see(iid)
# ... but this still doesn't return a valid bbox!?
b = tv.bbox(iid)
print(f"bbox of item {n}", b)
btn = Button(root, text="bbox", command=show_bbox)
btn.pack(side="bottom")
root.mainloop()
(start, then click the button until you reach an invisible item)
The second tv.bbox() call ought to return a valid bbox, but still returns empty string. Apparently see doesnt work immediately, but enqeues the viewport change into the event queue somehow. So my code cannot just proceed synchronously as it seems.
How to solve this? Can see() be made to work immediately? If not, is there another workaround?
The problem is that even after calling see, the item isn't visible (and thus, doesn't have a bounding box) until it is literally drawn on the screen.
A simple solution is to call tv.update_idletasks() immediately after calling tv.see(), which should cause the display to refresh.
Another solution is to use tv.after to schedule the display of the box (or the overlaying of an entry widget) to happen after mainloop has a chance to refresh the window.
def print_bbox(iid):
bbox = tv.bbox(iid)
print(f"bbox of item {iid}", bbox)
def show_bbox():
n[0] += 1
iid = iids[n[0]]
tv.see(iid)
tv.after_idle(print_bbox, iid)
I'm trying to display a ttk treeview in another window. The only option, it seems, is to iterate through the original treeview and populate the new one accordingly.
However I can't seem to get all the (many) subfolders in the right place, everything is mixed up as of the 2d level (i.e., I get the root folders and their children right, and after that the subfolders seem to be inserted at random locations).
The function is :
def getsubchildren(item=''):
children = []
for child in original_treeview.get_children(item):
i = new_treeview.insert(item, 'end', text=original_treeview.item(child)
['text'],values=original_treeview.item(child)['values'])
children.append(i)
for subchild in children:
getsubchildren(subchild)
And calling the function with getsubchildren(item=''), to start iterating from the first level.
There must be something I'm doing wrong, but I can't identify the issue and my attempts at modifying the function have only given a poorer result.
Any idea ?
Thanks,
Without known the depth of the item you need to check if the item has children. If so you need the function to call itself in a loop. Here is a working exampel:
import tkinter as tk
from tkinter import ttk
root = tk.Tk()
maintree = ttk.Treeview(root)
maintree.pack()
first = maintree.insert("","end",text='first')
second= maintree.insert(first,"end",text='second')
third= maintree.insert(second,"end",text='third')
fourth= maintree.insert(third,"end",text='fourth')
st = maintree.insert("","end",text='1st')
nd= maintree.insert(st,"end",text='2nd')
rd= maintree.insert(nd,"end",text='3rd')
th= maintree.insert(rd,"end",text='4th')
top = tk.Toplevel(root)
subtree = ttk.Treeview(top)
subtree.pack()
def copy_item_tree(item,child):
for child in maintree.get_children(child):
item = subtree.insert(item,"end",
text=maintree.item(child)['text'])
if maintree.get_children(child):
copy_item_tree(item,child)
def copy_tree():
for child in maintree.get_children():
item = subtree.insert("","end",text=maintree.item(child)['text'])
copy_item_tree(item,child)
button = tk.Button(root,text='Copy Tree', command=copy_tree)
button.pack(fill='x')
root.mainloop()
I am having some issues wrapping my head around something I encountered in python recently.
So, basically, I want to allow for a user to load several json files, all listed in a python list. These files contain parameters used to create buttons with, namely, the color the button should have, the text that should be displayed in it and the command that it needs to execute once clicked.
def createTags(self):
for items in self.LoadedInstallProfiles:
with open(items, "r") as jsonfiles:
self.loadeddata = json.load(jsonfiles)
self.tag = Button(self.tagmenu, text=self.loadeddata.get("profilename"), background=
self.loadeddata.get("profilecolor"), command=print(self.loadeddata.get("profilename")))
self.tag.pack(side="top",fill="x")
The problem is: the buttons show up with their individual color and text, but all seem to print out the same profilename when clicked, which is that in the last json file in the list.
I common way is to store the created button widgets in a list. I have modified your method. See below.
def createTags(self):
# First create the widget and append to list variable
self.tags = [] #List to store button widgets
for items in self.LoadedInstallProfiles:
with open(items, "r") as jsonfiles:
loadeddata = json.load(jsonfiles)
text = loadeddata.get("profilename")
bg = loadeddata.get("profilecolor")
tag = Button( self.tagmenu, text=text, background=bg, command=print(text) )
self.tag.append( tag )
# Then display the widgets
for tag in self.tags:
tag.pack(side="top",fill="x")
I imagine the problem with command=print(self.loadeddata.get("profilename")) is similar to the problem with lambda statements (that said I am surprised your buttons work at all They should print once at init and then never work after that because you are calling print at button creation instead of saving a reference to print).
Due to the nature of how lambda works here in a loop like this you end up only printing the last value in the loop for all commands. Instead you need to use a lambda statement and also define the value in the lambda for each loop to accurately record the correct data for the print statement.\
I created 3 test files for this:
test.json:
{"profilename":"test", "profilecolor": "green"}
test2.json:
{"profilename":"test2", "profilecolor": "blue"}
test3.json:
{"profilename":"test3", "profilecolor": "orange"}
Example code:
import tkinter as tk
import json
class Window(tk.Tk):
def __init__(self):
super().__init__()
self.btn_list = []
for file in ['test.json', 'test2.json', 'test3.json']:
with open(file, 'r') as f:
self.btn_list.append(json.load(f))
self.create_tags()
def create_tags(self):
for item in self.btn_list:
tk.Button(self, text=item.get("profilename"), background=item.get("profilecolor"),
command=lambda x=item.get("profilename"): print(x)).pack(side="top", fill="x")
if __name__ == '__main__':
Window().mainloop()
Results:
What I am trying to do track when any values in a list of StringVar change, even when the list is expanding. Any additions to the list before the trace statement will result in the callback. But any additions afterward, such as when pressing a button, will not cause any callback.
import tkinter as tk
root = tk.Tk()
frame = tk.Frame(root)
frame.grid(row=0)
L = []
def add_entry(event):
L.append(tk.StringVar())
tk.Entry(frame,textvariable=L[len(L)-1]).grid(row=len(L),padx=(10,10),pady=(5,5))
add = tk.Button(frame,text='add Entry',command='buttonpressed')
add.grid(row=0)
add.bind('<Button-1>',add_entry)
for i in range(2):
L.append(tk.StringVar())
tk.Entry(frame,textvariable=L[len(L)-1]).grid(row=len(L),padx=(10,10),pady=(5,5))
for i in L:
i.trace('w',lambda *arg:print('Modified'))
root.mainloop()
Modifying the first two Entry's prints out Modified, but any Entry's after the trace is run, such as the ones produced when a button is pressed, will not.
How do I make it so that trace method will run the callback for the entire list of variables even if the list is expanded?
Simple suggestion, change your add_entry function to something like this:
def add_entry(event):
L.append(tk.StringVar())
tk.Entry(frame,textvariable=L[len(L)-1]).grid(row=len(L),padx=(10,10),pady=(5,5))
L[len(L)-1].trace('w',lambda *arg:print('Modified'))
Extra suggestions:
This add = tk.Button(frame,text='add Entry',command='buttonpressed') is assigning a string to command option, means it will try to execute that string when button is clicked(which will do nothing). Instead, you can assign your function add_entry to command option and it will call that function when button is clicked and you can avoid binding Mouse Button1 click to your Button(Note: No need to use argument event in function when using like this). Read more here
Python supports negative indexing of List, so you can call L[-1] to retrieve the last element in the list instead of calling L[len(L)-1]).
Once you change your add_entry function as suggested, you can reduce your code to
import tkinter as tk
root = tk.Tk()
frame = tk.Frame(root)
frame.grid(row=0)
L = []
def add_entry():
global L
L.append(tk.StringVar())
tk.Entry(frame,textvariable=L[-1]).grid(row=len(L),padx=(10,10),pady=(5,5))
L[-1].trace('w',lambda *arg:print('Modified'))
add = tk.Button(frame,text='add Entry',command=add_entry)
add.grid(row=0)
for i in range(2):
add_entry()
root.mainloop()
What I'm trying to do is to make a GUI where when you start typing in an entry-box another shows up just beneath the one you are typing in. Then when you start typing in the one that popped up, another pops up. Is this possible with TKinter and Python?
Edit:
So what I currently have is this:
entry1 = StringVar()
numberLabel3 = Label(window, text = "3. External meeting attendees")
r+=1
numberLabel3.grid(column = 0, row = r, sticky = W)
externalAtendeesLabel = Label(window, text = "input name of external meeting atendee: ")
r+=1
externalAtendeesLabel.grid(column = 1, row = r, sticky = E)
externalAtendeesEntry = Entry(window, textvariable = entry1)
externalAtendeesEntry.grid(column = 2, row = r)
#Note to self: Find a smart way of dynamically expanding this "list" of entries
(There is more code above and below this, but this is the relevant code for my question)
where r is a variable I made to make it easier to insert stuff into the middle of my rather long code.
The imports I'm using are:
from tkinter import *
from PIL import ImageTk
from PIL import Image
import os
I use the image modules and OS to insert an image further up in my GUI.
What I was thinking was to make a function that I could somehow setup to check the newest Entry-box, but I've run into the problem that for this to be potentially infinite I would have to dynamically create new variables, so that I can access the information that the user inputs. These variables would save the info just like my entry1 variable does it for the externalAtendeesEntry.
I would also have to dynamically make variables for more entries.
How do I dynamically create a potentially infinite amount of variables?
I know that this is kind of a re-post, but the other ones I've found all say that you should use dictionaries, but in that case it can't be infinite. It can only be finite to the point where my dictionary is no longer.
For one, you don't need to use StringVar. It only complicates your code without providing any real value. The other part of the answer is to store the entries in a list.
For example, create a function called addEntry that creates an entry and adds it to a list:
entries = []
...
def addEntry():
entry = tk.Entry(...)
entry.pack(...)
entries.append(entry)
To get the values at a later date, just iterate over the list:
for entry in entries:
print(entry.get())
With that, you can add entries whenever you want. You could, for example, bind to <Any-KeyRelease> to create a new entry as the user types (being sure to only do it if there isn't already a blank entry). Or, bind to <Return> or <FocusOut>, or on the click of a "new person" button, or however else you decide.