CODEWITHSUNDEEP
python
Ben
Ben

Reputation: 99

Python: How to know the number of row of a text file

I want to know the number of row of a text file. How can I do this?

Upvotes: 1

Views: 1575

Answers (4)

Dan D.
Dan D.

Reputation: 74675

if iterating over a file:

for line_no, line in enumerate(f, start=1):

or if counting the lines in a file (f):

count = sum( 1 for line in f )

Upvotes: 4

GreenMatt
GreenMatt

Reputation: 18590

As @Dan D. said, you can use enumerate() on the open file. The default is to start counting with 0, so if you want to start the line count at 1 (or something else), use the start argument when calling enumerate(). Also, it's considered poor practice to use "file" as a variable name, as there is a function by that name. Thus, try something like:

for line_no, line in enumerate(open(file_name), start=1):
    print line_no, line

Upvotes: 1

SpliFF
SpliFF

Reputation: 39014

f = open("file.text")
count = sum(1 for line in f)

which is equivalent to

count = 0
for line in f:
   count+=1

Upvotes: 2

romeroqj
romeroqj

Reputation: 839

f = open('textfile.txt', 'rb')
len(f.readlines())

readlines() method returns a list where each index holds a line of textfile.txt.

Upvotes: 3

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