在Python中逗号后得到8位数字

Question

I wouldlike to get 8 digit after comma but I tried everything, no one solution actually resolve my problem:

tab_freq=(result[1]/1e6)
value_freq=str(tab_freq)[1:-1]
print value_freq

I tried this :

 value_freq2=format(value_freq,".8f")

and I get always the same error :

Unknown format code 'f' for object of type 'str'

Thanks for your help !

Answer 1

".8f" will work on numbers, not strings.

Try converting it to a float first:

value_freq2=format(float(value_freq),".8f")

---

In response to your comments below, you first need to split all the values in value_freq2 and apply the format to each one, then rejoin them.

 value_freq = "100. 100.98 105.344444 104." value_list = [format(float(v), ".8f") for v in value_freq.split()] value_freq2 = "\\n".join(value_list)