Question

I’m running some python code and get an error:

Exception in Tkinter callback
Traceback (most recent call last):
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1413, in __call__
    return self.func(*args)
  File "multiline14.py", line 28, in getText
    if encodinghex in process:
TypeError: argument of type 'function' is not iterable

My def is below.

def gui(item):
    def default_encode(s):
        pass

    # map items from menu to commands
    encodinghex = '.encode("hex")'
    decodinghex = '.decode("hex")'
    mapping = {"encode_b64": base64.encodestring,"encode_url": urllib.quote_plus,"encode_hex": encodinghex, "decode_b64": base64.decodestring, "decode_url": urllib.unquote_plus, "decode_hex": decodinghex}


    process = mapping.get(item, default_encode)

    def getText():
    #clear bottom text field
        bottomtext.delete(1.0, END)
    #var equals whats in middle
        var = middletext.get(1.0, 'end-1c')

    #insert encoded var in bottom
        if encodinghex in process:
            var = '"%s"' % (var)
            bottomtext.insert(INSERT, eval(var + process))
        elif decodinghex in process:
            var = '"%s"' % (var)
            bottomtext.insert(INSERT, eval(var + process))
        else:
            bottomtext.insert(INSERT, process(var))

What causes that error?

Answer 1

You are requesting a function from mapping here:

process = mapping.get(item, default_encode)

You then try and iterate it here:

if encodinghex in process:

You can’t use the in keyword unless the subject is Iterable.

What you’re trying to achieve here is to actually see which function your call to mapping.get() returned

if process == encodinghex:

Note that base64.encodestring, urllib.quote_plus, encodinghex, base64.decodestring, urllib.unquote_plus, decodinghex are all functions