Python - Counting blank lines in a text file -

let's have file following content(every line blank):

line 1

line 2

line 3

...

i tried read file in 2 ways:

count = 0 line in open("myfile.txt"):    if line == '':                   #or if len(line) == 0      count += 1 

and

count = 0  file = open('myfile.txt') lines = file.readlines() line in lines:    if line == '':                   #or if len(line) == 0      count += 1 

but count remains 0. how can count number of blank lines?

in more simple , pythonic way:

with open(filename) fd:     count = sum(1 line in fd if len(line.strip()) == 0) 

this keep linear complexity in time , constant complexity in memory. and, of all, rid of variable count manually incremented variable.