# ruler.py
"""
Program to display a ruler on the console.
Author: Vasudev Ram
Copyright 2016 Vasudev Ram - http://jugad2.blogspot.com
Description: Program to display a ruler on the command-line screen.
The ruler consists of repeated occurrences of the characters:
0123456789, concatenated, with interals of 10's marked above or below.
Purpose: By running this program, you can use its output as a ruler,
to find the position of your own program's output on the line, or to
find the positions and lengths of fields in fixed- or variable-length
records in a text file, fields in CSV files, etc.
"""
REPS = 8
def ruler(sep=' ', reps=REPS):
for i in range(reps):
print str(i) + ' ' * 4 + sep + ' ' * 3,
print '0123456789' * reps
def main():
# Without divider.
ruler()
# With various dividers.
for sep in '|+!':
ruler(sep)
if __name__ == '__main__':
main()
