Count the number of lines in a text fileΒΆ

Count the number of lines in a text file.
def file_lengthy(fname):
    with open(fname) as f:
        for i, l in enumerate(f):
            pass
    return i + 1

# test
print("Number of lines in the file: ", file_lengthy("test.txt"))

Output:

Number of lines in the file:  6