int list have no len()

[lateublegende]

I try to write my list, but I need len() for write it.
if I write in str, they print 5 item.
this is my code

y=list(map(int, y))
print(y)
y[0]+=1
print(y)

f = sftp.open("/home/pi/SiteCyberdependance/donne/donne.txt", "w+")
with sftp.open("/home/pi/SiteCyberdependance/donne/donne.txt", "w") as f:
            sftp=paramiko.SFTPFile.write
            f.write(y[item])

Error:
TypeError: object of type 'int' has no len()