from functools import reduce

import datetime

reduce(lambda x, y: x + y, range(1, 10))

# Lets compute the length of a file's longest line

# rstrip returns a string copy that has no trailing spaces

#(or the character specified)

# eg: "Hello...".rstrip(".") returns "Hello"

t = datetime.datetime.now()

r1 = reduce(max, map(lambda l: len(l.rstrip()), [line for line

in open('logs_out.txt')]))

print("reduce time: {}".format(datetime.datetime.now() - t))

print(r1)

# Another way of doing the same with generator comprehensions and numpy

t = datetime.datetime.now()

r2 = max((len(line.rstrip()) for line in open('logs_out.txt')))

print("max(generator) time: {}".format(datetime.datetime.now() - t))

print(r2)

# To visualize the lines of the file

for line in open('logs_out.txt'):

print(line.rstrip())