Python:Detect if the current line in file read is the last one -

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I am reading a file in a Python line through a line and I need to know which during reading Line is the last, something like this: 

  f = for the line in the open ("myfile.txt") f: if the line is the last line: #d smth

I found it to complete and complete the files to count the lines, etc. Do I just find out that the current line is last? I tried to go and check "\ n" existence, but in many cases backlash of previous lines has not been en.

Sorry if my question is unhelpful because I did not get the answer 

  SecondLastLine = None None with LastLine = Open ("myfile.txt") as infile: Second Listline, Last Line = Infil.Redline (), infile.readline () for row in Infill: # dot Stuff secondsLastline = Last Line LastLine = Line #Last LastLine

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