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I want to get a PDF file, but I get an error: AttributeError: 'NoneType' object has no attribute 'show' . The error says that can doesn't have the attribute show . Why? As you can see, I import show from pychart.canvas .

from pychart import *
from pychart.canvas import show
can = canvas.init("pic.pdf")
x, y = (100, 500)
def show_text(str):
    global x, y
    can.show(x, y, str)
    can.show(x + 200, y, "/12/C" + font.quotemeta(str))
    y -= 20
show_text("/12/hLLeft align")
show_text("/12/hRRight align")
show_text("/12/hCCenter align")
show_text("/a20/12/hRAngled text")
def show_textv(str):
    global x, y
    can.show(x, y, str)
    x += 150
y -= 40
x = 100
show_textv("/12/vT//12//vTTop align")
show_textv("/12/vM//12//vT/12Middle align")
show_textv("/12/vB//12//vT/12Bottom align")
y -= 40
x = 100
show_text("/16/HHelvetica")
show_text("/12/CCourier")
show_text("/12/NHelvetica-Narrow")
show_text("/12/PPalatino-Roman")
show_text("/12/AAvantgarde")
show_text("/12/T/iTimes-Italic")
show_text("/12/F{ZapfDingbats}ZapfDingbats")
                Is that all of your code?  What line does the error occur on?  Glancing at the pychart documentation, it doesn't look like canvas.init should ever return None, which is what appears to be happening from what you have given us.  Also, is there a reason you are importing pychart.canvas.show - you don't appear to be using it anywhere.
– James
                Jun 5, 2012 at 9:24
                The line where the error occurs on as follows:File "C:\Users\wangling\Desktop\pdf6.py", line 8, in show_text     can.show(x, y, str) AttributeError: 'NoneType' object has no attribute 'show'
– wangling
                Jun 5, 2012 at 9:31
you actually call None.show(x, y, str) and get AttributeError, because None doesn't have 'show' attribute
To fix your problem try to investigate why can == None
        
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