tgt.write_to_file issue

[ziweizh]

As shown below, I tried to loop through the directory of TextGrid files, extract the first and second tier of each TextGrid and save them as designed file name:
`import tgt
import os

os.chdir('/Users/ziweizh/Documents/ISU_ALT/2017_Spring/ENGL_515/Final_Project/RSMTool/Feature_Extraction/Prosody/MFA_output')
tg_list = os.listdir('/Users/ziweizh/Documents/ISU_ALT/2017_Spring/ENGL_515/Final_Project/RSMTool/Feature_Extraction/Prosody/MFA_output')[1:-1]

for i in tg_list:
tg = tgt.read_textgrid(i)
word_tier = tg.get_tier_by_name('words')
phone_tier = tg.get_tier_by_name('phones')
os.chdir('/Users/ziweizh/Documents/ISU_ALT/2017_Spring/ENGL_515/Final_Project/RSMTool/Feature_Extraction/Prosody/TG_MFA')
tgt.write_to_file(word_tier,i[:5]+'-'+'word'+'.'+'TextGrid',format = "short")
tgt.write_to_file(phone_tier,i[:5]+'-'+'phone'+'.'+'TextGrid',format = "short")
`

But when I an error message as shown below:
AttributeError: 'Interval' object has no attribute 'tier_type'

Is it because, unlike TextGrid object, an interval tier cannot be written to file?

[mwlodarczak]

Yes, that's correct. Only TextGrid objects can be saved to a file. I am not sure what you are trying to achieve but you could always create a new TextGrid object with only one Tier and save that.