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def cut_sentence(line, length):
"""
Cut a given sentence, so it becomes shorter than or equal to a given length.
"""
if length >= len(line):
return line
if line[length] == " ":
return line[:length]+"..."
line = line[:length].split(" ")
line.pop()
return " ".join(line)+"..."
if __name__ == '__main__':
# These "asserts" using only for self-checking and not necessary for auto-testing
assert cut_sentence("Hi my name is Alex", 4) == "Hi...", "First"
assert cut_sentence("Hi my name is Alex", 8) == "Hi my...", "Second"
assert cut_sentence("Hi my name is Alex", 18) == "Hi my name is Alex", "Third"
assert cut_sentence("Hi my name is Alex", 20) == "Hi my name is Alex", "Fourth"
print('Done! Do you like it? Go Check it!')