CODEWITHSUNDEEP
python
Tanner Quigley
Tanner Quigley

Reputation: 246

Get length of line in Java file using python

I want to be able to get the length of each line of a java file using python ignoring spaces and white space. I would eventually put each line length into an array. Take this java file: 

public class HelloWorld {

    public static void main(String[] args) {
         System.out.println("Hello world");
    } 

}

The array for this file would read: 

{22,34,33,1,1,}

what is the best way to go about this? I am more than capable of creating the array but how can I go about finding the length of each line?

Upvotes: 0

Views: 226

Answers (4)

adnanalhomssi
adnanalhomssi

Reputation: 129

This should work : 

with open('input') as f:
    output = []
    for line in f:
        line = line.split()
        if line != [] :
            line = "".join(line)
            output.append(len(line))
    print output

Upvotes: 1

jonrsharpe
jonrsharpe

Reputation: 122059

The {a, b, c} notation in Python is a set, which you don't want (no duplicate items allowed); try a list, [a, b, c].

To remove whitespace from the start and end of the lines, use str.strip(); this will remove tabs/spaces/newlines at the start and end of the line. To remove spaces from inside the line, use str.replace(' ', ''). Once you have stripped the extra characters, the length of the line is simply len(line).

You can use a list comprehension to create the list in one step, for file f:

output = [len(l) for l in (line.strip().replace(' ', '') 
                           for line in f) if len(l) > 0]

gives me [22, 35, 33, 1, 1].

Upvotes: 2

hexparrot
hexparrot

Reputation: 3417

Focusing on the part of your question "how can I go about finding the length of each line?", you can use this code. 

bad_chars = ' \t\n\r'

def count_chars():
    with open('someclass.java', 'r') as javafile:
        for line in javafile:
            cleaned = filter(lambda c: c not in bad_chars, line)
            if cleaned:
                yield len(cleaned)

You definitely can and should refactor this to meet your needs (perhaps having the java filename as a function argument), but this should give you non-whitespace counts, as defined by not including characters in bad_chars.

RETURNS:

>>> print list(count_chars())
[22, 35, 33, 1, 1]

Upvotes: 2

willy
willy

Reputation: 1490

Do something like this:

    for line in open('file.java', 'r'):
        lineLength = len(line.replace(' ', ''))

Upvotes: 1

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