Can someone elaborate this code

Question

file = open("/usercode/files/books.txt", "r")

for line in file :
print(line[0] + str(len(line.strip())))

file.close()

Especially the line.strip part

(Taken from python core module end question)

Answer 1

strip() is an inbuilt function in Python programming language that returns a copy of the string with both leading and trailing characters removed (based on the string argument passed).
src: https://www.geeksforgeeks.org/python-string-strip/

[CODE]
l = '@@lone@@@'
print(l.strip('@'))
# O/P: lone

r = ' cool '
print(r.strip())
# O/P: cool