number minimal of argument for export data

Hello,

I encounter an anomaly in the export.textExt () function When I give in parameter That a single argument, I have an execution error. i have to passed two argument minimum for not have of error

see example below :

=======================================================================================================
EXAMPLE 1 : with error
=======================================================================================================
export.textExt('../../tmp/data_export_melangeur.txt',format='x_y_z_r_attrs',attrs=('b.mat.id'))
=======================================================================================================

Exportation des données en cours...
---------------------------------------------------------------------------
SyntaxError Traceback (most recent call last)
/soft/yade/1.12.0/gcc/4.4.7/bin/yade-1.12.0 in <module>()

/soft/yade/1.12.0/gcc/4.4.7/bin/yade-1.12.0 in ExportData()
     52 # export.textExt('../../tmp/data_export_melangeur.txt',format='x_y_z_r_matId',attrs=('b.mat.label'))
     53 # export.textExt('../../tmp/data_export_melangeur.txt',format='x_y_z_r_attrs',attrs=('b.shape.color','b.state.pos' ))
---> 54 export.textExt('../../tmp/data_export_melangeur.txt',format='x_y_z_r_attrs',attrs=('b.mat.id'))
     55
     56 def testcode():

/soft/yade/1.12.0/gcc/4.4.7/lib64/yade-1.12.0/py/yade/export.pyc in textExt(filename, format, comment, mask, attrs)
     56 output+=('%g\t%g\t%g\t%g'%(b.state.pos[0],b.state.pos[1],b.state.pos[2],b.shape.radius))
     57 for cmd in attrs:
---> 58 v = eval(cmd)
     59 if isinstance(v,(int,float)):
     60 output+='\t%g'%v

SyntaxError: unexpected EOF while parsing (<string>, line 1)

=======================================================================================================
EXAMPLE 2 : with error
=======================================================================================================
export.textExt('../../tmp/data_export_melangeur.txt',format='x_y_z_r_attrs',attrs=('b.shape.color'))
=======================================================================================================

Exportation des données en cours...
---------------------------------------------------------------------------
SyntaxError Traceback (most recent call last)
/soft/yade/1.12.0/gcc/4.4.7/bin/yade-1.12.0 in <module>()

/soft/yade/1.12.0/gcc/4.4.7/bin/yade-1.12.0 in ExportData()
     52 # export.textExt('../../tmp/data_export_melangeur.txt',format='x_y_z_r_matId',attrs=('b.mat.label'))
     53 # export.textExt('../../tmp/data_export_melangeur.txt',format='x_y_z_r_attrs',attrs=('b.shape.color','b.state.pos' ))
---> 54 export.textExt('../../tmp/data_export_melangeur.txt',format='x_y_z_r_attrs',attrs=('b.shape.color'))
     55
     56 def testcode():

/soft/yade/1.12.0/gcc/4.4.7/lib64/yade-1.12.0/py/yade/export.pyc in textExt(filename, format, comment, mask, attrs)
     56 output+=('%g\t%g\t%g\t%g'%(b.state.pos[0],b.state.pos[1],b.state.pos[2],b.shape.radius))
     57 for cmd in attrs:
---> 58 v = eval(cmd)
     59 if isinstance(v,(int,float)):
     60 output+='\t%g'%v

SyntaxError: unexpected EOF while parsing (<string>, line 1)

=======================================================================================================
EXAMPLE 3,4 and 5 : no error
=======================================================================================================
export.textExt('../../tmp/data_export_melangeur.txt',format='x_y_z_r_attrs',attrs=('b.shape.color','b.state.pos' ))
=======================================================================================================

#format x_y_z_r_attrs
0.336553	0.0248906	-0.835412	0.02	0.336553	0.0248906	-0.835412	1	0	1
-0.318431	-0.174808	-0.780485	0.02	-0.318431	-0.174808	-0.780485	1	0	1
0.232435	-0.145611	-0.799793	0.02	0.232435	-0.145611	-0.799793	1	0	1
0.169229	-0.38806	-0.784145	0.02	0.169229	-0.38806	-0.784145	1	0	1
-0.120705	-0.213641	-0.738489	0.02	-0.120705	-0.213641	-0.738489	1	0	1
-0.243449	-0.293311	-0.784106	0.02	-0.243449	-0.293311	-0.784106	1	0	1

=======================================================================================================
export.textExt('../../tmp/data_export_melangeur.txt',format='x_y_z_r_attrs',attrs=('b.shape.color','b.mat.id' ))
=======================================================================================================

#format x_y_z_r_attrs
0.124342	-0.423004	-0.650883	0.02	1	0	1	0
-0.0990602	-0.201278	-0.747631	0.02	1	0	1	0
0.0408943	-0.36283	-0.695135	0.02	1	0	1	0
0.146338	-0.411332	-0.784349	0.02	1	0	1	0
-0.0313473	-0.190286	-0.749565	0.02	1	0	1	0
0.134005	-0.431563	-0.748373	0.02	1	0	1	0
0.192398	-0.0521496	-0.806122	0.02	1	0	1	0

=======================================================================================================
export.textExt('../../tmp/data_export_melangeur.txt',format='x_y_z_r_attrs',attrs=('b.shape.color','b.mat.id','b.state.pos' ))
=======================================================================================================

#format x_y_z_r_attrs
-0.0663139	-0.282156	-0.724299	0.02	1	0	1	0	-0.0663139	-0.282156	-0.724299
0.441224	0.112877	-0.902508	0.02	1	0	1	0	0.441224	0.112877	-0.902508
0.166181	-0.275276	-0.754	0.02	1	0	1	0	0.166181	-0.275276	-0.754
0.172778	-0.385368	-0.755037	0.02	1	0	1	0	0.172778	-0.385368	-0.755037
0.107078	-0.371537	-0.688094	0.02	1	0	1	0	0.107078	-0.371537	-0.688094
0.0671631	-0.500364	-0.742586	0.02	1	0	1	0	0.0671631	-0.500364	-0.742586
-0.341773	-0.296308	-0.76077	0.02	1	0	1	0	-0.341773	-0.296308	-0.76077
0.133467	-0.384747	-0.747603	0.02	1	0	1	0	0.133467	-0.384747	-0.747603

Alexandre,

Original bug report by Alex on 2015-02-10 : https://bugs.launchpad.net/yade/+bug/1420248

Edited by Janek Kozicki