python how to check if a line is an empty line

Question

Trying to figure out how to write an if cycle to check if a line is empty   The file has many strings  and one of these is a blank line to separate from the other statements  not a     is a carriage return followed by another carriage return I think   new statement asdasdasd asdasdasdasd  new statement asdasdasdasd asdasdasdasd   Since I am using the file input module  is there a way to check if a line is empty    Using this code it seems to work  thanks everyone   for line in x       if line      n           print  found an end of line   x close

User · Answer

I use the following code to test the empty line with or without white spaces   if len line strip       0         do something with empty line

User · Answer

If you want to ignore lines with only whitespace   if not line strip            do something   The empty string is a False value   Or if you really want only empty lines   if line in    n     r n            do  something

User · Answer

You should open text files using rU so newlines are properly transformed  see http   docs python org library functions html open  This way there s no need to check for  r n

User · Answer

I think is more robust to use regular expressions   import re  for i  line in enumerate content       print line if not  re match   r  n   line   else pass   This would match in Windows unix  In addition if you are not sure about lines containing only space char you could use    s  r  n  as expression

User · Answer

line strip           Or  if you don t want to  eat up  lines consisting of spaces   line in    n     r n

[python] python: how to check if a line is an empty line

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