Count how many records are in a CSV Python?

Question

I\'m using python (Django Framework) to read a CSV file. I pull just 2 lines out of this CSV as you can see. What I have been trying to do is store in a variable the total n

Answer 1

numline = len(file_read.readlines())

Answer 2

row_count = sum(1 for line in open(filename)) worked for me.

Note : sum(1 for line in csv.reader(filename)) seems to calculate the length of first line

Answer 3

when you instantiate a csv.reader object and you iter the whole file then you can access an instance variable called line_num providing the row count:

import csv
with open('csv_path_file') as f:
    csv_reader = csv.reader(f)
    for row in csv_reader:
        pass
    print(csv_reader.line_num)

Answer 4

You need to count the number of rows:

row_count = sum(1 for row in fileObject)  # fileObject is your csv.reader

Using sum() with a generator expression makes for an efficient counter, avoiding storing the whole file in memory.

If you already read 2 rows to start with, then you need to add those 2 rows to your total; rows that have already been read are not being counted.

Answer 5

import pandas as pd
data = pd.read_csv('data.csv') 
totalInstances=len(data)

Answer 6

try

data = pd.read_csv("data.csv")
data.shape

and in the output you can see something like (aa,bb) where aa is the # of rows