Update app.py

app.py

@@ -60,7 +60,7 @@ with st.form('get signature'):
     remove_old_vcf()
     sub=st.form_submit_button('submit input')
     
-if sub and file_to_lookat !=[]::    
+if sub and file_to_lookat !=[]:   
     #if st.button('get reference genome'):
     st.write(os.path.dirname(SigProfilerMatrixGenerator.__file__))
     dirtest=os.path.join(os.path.dirname(SigProfilerMatrixGenerator.__file__),'references/chromosomes/tsb/GRCh37/')+'*txt'