how to count the total number of lines in a text file using python

Question

For example if my text file is:

blue
green
yellow
black

Here there are four lines and now I want to get the result as four. How can I do th

Answer 1

You can use sum() with a generator expression here. The generator expression will be [1, 1, ...] up to the length of the file. Then we call sum() to add them all together, to get the total count.

with open('text.txt') as myfile:
    count = sum(1 for line in myfile)

It seems by what you have tried that you don't want to include empty lines. You can then do:

with open('text.txt') as myfile:
    count = sum(1 for line in myfile if line.rstrip('\n'))

Answer 2

count=0
with open ('filename.txt','rb') as f:
    for line in f:
        count+=1

print count

Answer 3

For the people saying to use with open ("filename.txt","r") as f you can do anyname = open("filename.txt","r")

def main():

    file = open("infile.txt",'r')
    count = 0
    for line in file:
            count+=1

    print (count)

main ()

Answer 4

One liner:

total_line_count = sum(1 for line in open("filename.txt"))

print(total_line_count)

Answer 5

here is how you can do it through list comprehension, but this will waste a little bit of your computer's memory as line.strip() has been called twice.

     with open('textfile.txt') as file:
lines =[
            line.strip()
            for line in file
             if line.strip() != '']
print("number of lines =  {}".format(len(lines)))

Answer 6

Use:

num_lines = sum(1 for line in open('data.txt'))
print(num_lines)

That will work.