ValueError-trying to split a line

[samu3l]

i try to change the line as you said but it give me en error, i should have change some values ?

Error:
Traceback (most recent call last):
  File "C:\Users\samue\Documents\Documents\prepa\PT\tipe\expérimentation\releves\moyenne_val_triée.py", line 19, in <module>
    print('length: {}, ligne: {}',format(len(ligne),ligne))
ValueError: Invalid format specifier

the code

with open("data.txt","r") as f:
    for i in f:
        for _ in range(10):
            ligne=f.readline()
            print(ligne)
            ligne.strip().split("\t")
            print('length: {}, ligne: {}',format(len(ligne),ligne))
            t,h,Text,Tint,lux = ligne