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+--- Thread: what does "yield '\n'" do? (/thread-7929.html)
what does "yield '\n'" do? - 2sky - Jan-30-2018
I have seen this sample code from one python book:
def lines(file):
for line in file: yield line
yield '\n'
def blocks(file):
block = []
for line in lines(file):
if line.strip():
block.append(line)
elif block:
yield ''.join(block).strip()
block = []I am not sure what does "yield '\n'" do in line 3. I am also not sure when these two conditions: "if line.strip()" and "elif block" will be triggered. I am pretty new in python. Hope you guys can help me understand this code more. thanks!
RE: what does "yield '\n'" do? - Gribouillis - Jan-30-2018
yield '\n' generates a string containing a single newline after all the lines have been generated. It is a way to ensure that there is a newline at the end of the file by adding a newline. The if line.strip() test succeeds if it remains anything in the line after removing all the white space at both ends.
RE: what does "yield '\n'" do? - 2sky - Jan-30-2018
(Jan-30-2018, 09:10 AM)Gribouillis Wrote:yield '\n'generates a string containing a single newline after all the lines have been generated. It is a way to ensure that there is a newline at the end of the file by adding a newline. Theif line.strip()test succeeds if it remains anything in the line after removing all the white space at both ends.
Thanks a lot for your explanation!