count the lines of a program in python

Question

I found this question in a textbook to write code to count the number of lines of program by running it.

This is what I have:

import commands,os,sys

def count_lines(modul):
    cmd="wc -l " + modul +" | awk '{print $1}'"
    return commands.getoutput(cmd)


if __name__=='__main__':
    print count_lines(sys.modules[__name__].__file__)

It seems to work;but I am not sure if this the right way to do. I thought this is simpler.

You're not really writing Python there. You're writing a shell script in a Python wrapper. — user2357112
– user2357112, Commented Jan 15, 2014 at 0:05
@user2357112: I agree; but most of the python functions are wrappers of C. correct me if I am wrong..? — eagertoLearn
– eagertoLearn, Commented Jan 15, 2014 at 0:11
@eagertoLearn: Whether that's true or false (I consider it false), it's not relevant. They're definitely not wrappers around shell scripting (which is entirely distinct from C), and whatever the implementation of Python, there's no reason to embed a second programming language and spawn several additional processes just to perform this simple task. — user2357112
– user2357112, Commented Jan 15, 2014 at 0:17

Joran Beasley · Accepted Answer · 2014-01-15 00:22:54Z

3

print "I AM %d LINES LONG"%len(list(open(__file__))) just put that in any file...

if you insist on closing your file (while a good habit , not necessary in cython especially when only reading)

with open(__file__) as f:
    print "I AM %d LINES LONG"%len(list(f))

edited Jan 15, 2014 at 0:22

answered Jan 15, 2014 at 0:08

Joran Beasley

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5 Comments

Joran Beasley Over a year ago

you dont need that ... and it would be readlines I think ... but by default it will iterate into a list right?

eagertoLearn Over a year ago

it has to count the lines of the file that this line is present? will it work?

aIKid Over a year ago

Ah yeah, he is asking for the lines. My bad.

user2357112 Over a year ago

open without a close or with? Don't teach bad habits; close your file.

Joran Beasley Over a year ago

it doesnt matter if hes just reading and hes in cython ... but edited all the same ...

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