I've been fiddling with this snippet for producing a grid of tkinter Entry widgets. When I write the code like this, it works as intended:
import tkinter as tk
rows = []
for i in range(5):
cols = []
for j in range(4):
e = tk.Entry()
e.grid(row=i, column=j, sticky="nsew")
e.insert("end", '%d.%d' % (i, j))
cols.append(e)
rows.append(cols)
def onPress():
for row in rows:
for col in row:
print (col.get())
tk.Button(text='Fetch', command=onPress).grid()
tk.mainloop()
But if its like this, it runs the command "onPress" before the button is pressed:
import tkinter as tk
def entries():
rows = []
for i in range(5):
cols = []
for j in range(4):
e = tk.Entry()
e.grid(row=i, column=j, sticky="nsew")
e.insert("end", '%d.%d' % (i, j))
cols.append(e)
rows.append(cols)
return rows
def onPress(rows):
for row in rows:
for col in row:
print (col.get())
entries()
tk.Button(text='Fetch', command=onPress(entries())).grid()
tk.mainloop()
Why is this happening? It looks to me like these should be equivalent. I'm a beginner, so I'm probably missing something very obvious.
