python: "none"?

tjyorkshire · 08-14-2007, 04:43 PM

I'm currently learning python at the moment.
Ok, I wrote this:

Code:

#! /usr/bin/env python

# Initializes the board matrix
col1 = ["-","-","-"]
col2 = ["-","-","-"]
col3 = ["-","-","-"]
matrix = [col1,col2,col3]

# Prints current board
def printboard():
	print "   1  2  3"
	print "A ",matrix[0][0],"",matrix[1][0],"",matrix[2][0]
	print "B ",matrix[0][1],"",matrix[1][1],"",matrix[2][1]
	print "C ",matrix[0][2],"",matrix[1][2],"",matrix[2][2]

board = printboard()

print board

When i run it i get this:

Code:

   1  2  3
A  -  -  -
B  -  -  -
C  -  -  -
None

Why am i getting "None" appearing?

rubadub · 08-14-2007, 04:48 PM

Because your calling the 'printboard' function, which returns nothing... then printing it!
You probably want...

Code:

#! /usr/bin/env python

# Initializes the board matrix
col1 = ["-","-","-"]
col2 = ["-","-","-"]
col3 = ["-","-","-"]
matrix = [col1,col2,col3]

# Prints current board
def printboard():
	print "   1  2  3"
	print "A ",matrix[0][0],"",matrix[1][0],"",matrix[2][0]
	print "B ",matrix[0][1],"",matrix[1][1],"",matrix[2][1]
	print "C ",matrix[0][2],"",matrix[1][2],"",matrix[2][2]

printboard()

tjyorkshire · 08-14-2007, 05:35 PM

hahaha! I just had one of those light-bulb-above-the-head-turning-on moments!

It was such a silly little mistake staring me right in the face!

Thanks for your help!