Mode : string Cases APPEND_READ_WRITE = 'a+' APPEND_WRITE = 'a' CREATE_READ_WRITE = 'x+' CREATE_WRITE = 'x' READ = 'r' READ_WRITE = 'r+' WRITE = 'w' WRITE_READ = 'w+' Cases APPEND_READ_WRITE APPEND_WRITE CREATE_READ_WRITE CREATE_WRITE READ READ_WRITE WRITE WRITE_READ ×