How to determine which object is Nonetype and which is str in Python and how do I fix the Concatenate error?
When trying to install pygames to my enthought dome I run setup.py and it always gives "TypeError: cannot concatenate" str "and" Nonetype "objects
TypeError Traceback (most recent call last)
C:\Users\Allie\Canopy\pygame-master\setup.py in <module>()
145 # get compile info for all extensions
146 try:
--> 147 extensions = read_setup_file('Setup')
148 except:
149 print ("""Error with the "Setup" file,
C:\Users\Allie\AppData\Local\Enthought\Canopy32\App\appdata\canopy-1.5.2.2785.win-x86\lib\distutils\extension.pyc in read_setup_file(filename)
166
167 #print "original line: " + line
--> 168 line = expand_makefile_vars(line, vars)
169 words = split_quoted(line)
170 #print "expanded line: " + line
C:\Users\Allie\AppData\Local\Enthought\Canopy32\App\appdata\canopy-1.5.2.2785.win-x86\lib\distutils\sysconfig.pyc in expand_makefile_vars(s, vars)
407 if m:
408 (beg, end) = m.span()
--> 409 s = s[0:beg] + vars.get(m.group(1)) + s[end:]
410 else:
411 break
TypeError: cannot concatenate 'str' and 'NoneType' objects
Can anyone help me fix these lines to get my setup file running? Otherwise, I have no idea how to install pygames in a canopy.
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The code is trying to expand the variables in your Makefile, but couldn't find the specific variable.
First, the code parses all records VARNAME = value
, and then in the second step it tries to insert values into links $(VARNAME)
and ${VARNAME}
. It is that the second step, which was not listed as a variable name, was not defined, or at least not found in the first step.
The build system pygame
generates a named make file from a named Setup
file Setup.in
and this is a generated file that doesn't work here. Where Setup.in
has a section marked with #--StartConfig
/ #--EndConfig
, variables should be written. You will have to investigate which lines are missing and why.
You can rerun the config.py
script to re-generate the file; it delegates platform modules to work with.
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@ageoca, since you asked how to determine the type of None, you can try a simple if statement:
if v != None:
print(len(v))
else:
print(-1)
Using this, you can develop a strategy for this exception that you are facing.
You can also find a nice little tutorial describing this in a little more detail at dotnetpearls.com -> http://www.dotnetperls.com/none-python
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