Python - Attribute Error '_io.TextIOWrapper' object has no attribute 'open'

Question

I receive an error

File.open(classname+'.txt','a')
AttributeError: '_io.TextIOWrapper' object has no attribute 'open'

while trying to open a file. I need to open the file and write to the file with the scores.

Here is the code

if Exists==False:
    File.open(classname+'.txt','a')
    File.write(name+','+surname+','+str(1)+','+str(score)+'/n')

else:
    File=open(classname+'.txt','w')
    linecount=len(filelines)
    for i in range(0,linecount):
        File.write(filelines[i])

Answer 1

it should be

File=open(classname+'.txt','a')
File.write(name+','+surname+','+str(1)+','+str(score)+'/n')
File.close()