python tkinter how to organize the rows and columns - python-2.7

Question

Hi I'm trying to build a user interface and having problem with column and row positions. What I expect to see is some distance between buttons and entry widgets since I left two empty column between them. So why are they standing just next to the entry widgets and changing the distances between entry areas? Could anyone give me some help about this?
Here is the code...
from Tkinter import*
HMCC=Tk()
HMCC.title(" GUI v1.0 ")
HMCC.geometry("500x300")
entry_1 = Entry(HMCC)
entry_2 = Entry(HMCC)
entry_3 = Entry(HMCC)
entry_4 = Entry(HMCC)
entry_5 = Entry(HMCC)
entry_6 = Entry(HMCC)
entry_7 = Entry(HMCC)
entry_8 = Entry(HMCC)
entry_1.grid(row=2,column=1)
entry_2.grid(row=3,column=1)
entry_3.grid(row=4,column=1)
entry_4.grid(row=5,column=1)
entry_5.grid(row=6,column=1)
entry_6.grid(row=7,column=1)
entry_7.grid(row=8,column=1)
entry_8.grid(row=9,column=1)
Channel_1 = Label(HMCC, text = "Channel 1 : ")
Channel_2 = Label(HMCC, text = "Channel 2 : ")
Channel_3 = Label(HMCC, text = "Channel 3 : ")
Channel_4 = Label(HMCC, text = "Channel 4 : ")
Channel_5 = Label(HMCC, text = "Channel 5 : ")
Channel_6 = Label(HMCC, text = "Channel 6 : ")
Channel_7 = Label(HMCC, text = "Channel 7 : ")
Channel_8 = Label(HMCC, text = "Channel 8 : ")
Channel_1.grid( row = 2, column = 0, sticky = E)
Channel_2.grid( row = 3, column = 0, sticky = E)
Channel_3.grid( row = 4, column = 0, sticky = E)
Channel_4.grid( row = 5, column = 0, sticky = E)
Channel_5.grid( row = 6, column = 0, sticky = E)
Channel_6.grid( row = 7, column = 0, sticky = E)
Channel_7.grid( row = 8, column = 0, sticky = E)
Channel_8.grid( row = 9, column = 0, sticky = E)
#button1 = Button(text=" START " , fg="red" )
#button2 = Button(text=" PAUSE " , fg="blue" )
#button3 = Button(text=" STOP ", fg="green")
#button4 = Button(text="QUIT" , fg="black",command=HMCC.quit)
#button1.grid( row = 1, column = 3)
#button2.grid( row = 2, column = 3)
#button3.grid( row = 3, column = 3)
#button4.grid( row = 4, column = 3)
HMCC.mainloop()
Current view
Thanks in advance

Answer 1

If there is nothing in column 2, then tkinter will ignore it.
In addition to the comment posted above which contains the answer to your question, you can clean up your code significantly by just using a loop:
num_rows = 8
entries = [None]*num_rows
channels = [None]*num_rows
for i in range(num_rows):
channels[i] = Label(HMCC, text = "Channel {0} : ".format(i+1))
channels[i].grid(row=i+2,column=0,sticky=E)
entries[i] = Entry(HMCC)
entries[i].grid(row=i+2, column=1)
Better yet, use list comprehension:
num_rows = 8
entries = [Entry(HMCC).grid(row=i+2, column=1) for i in range(num_rows)]
channels = [Label(HMCC, text = "Channel {0} : ".format(i)).grid(row=i+2,column=0,sticky=E) for i in range(num_rows)]