python - ValueError:invalid literal for int() with base 10:' ' -

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I get this error in Python.

I am reading from a text file, try to convert it to a variable and integer by adding value to it. This is my code 

  fo = open ("HCTC3152_INF TXT "," r ") line1 = fo.readline ()

Part of the middle 52:56 year is always like 2013 or 2014 

  ChangeOperastStartdivaty YY = Intestine (Line 2 [52:56], 10) Change PrintOverStartDeti YY

Then, always print out the years in the command prompt, and finally see the error. TI.

got you

exclude those lines: 

  If not line.strip, then an empty line or at least one line  less  than 52 characters.  
 ():

To leave empty lines (only for white space), or for a minimal length test: 

 < Code> if len (line)> = 56:

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